diff --git a/Cargo.lock b/Cargo.lock
index 58dc6f5a9..8750b2337 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3291,12 +3291,14 @@ checksum = "8f54a172d0620933a27a4360d3db3e2ae0dd6cceae9730751a036bbf182c4b23"
 name = "vecdb"
 version = "0.6.8"
 dependencies = [
+ "itoa",
  "libc",
  "log",
  "lz4_flex 0.12.0",
  "parking_lot",
  "pco",
  "rawdb",
+ "ryu",
  "schemars",
  "serde",
  "serde_json",
diff --git a/crates/brk_types/src/anyaddressindex.rs b/crates/brk_types/src/anyaddressindex.rs
index 704ce5840..ba27f8e7e 100644
--- a/crates/brk_types/src/anyaddressindex.rs
+++ b/crates/brk_types/src/anyaddressindex.rs
@@ -62,8 +62,8 @@ impl fmt::Display for AnyAddressIndex {
 
 impl Formattable for AnyAddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
 
diff --git a/crates/brk_types/src/basis_points_16.rs b/crates/brk_types/src/basis_points_16.rs
index 8dbd55c00..f25349970 100644
--- a/crates/brk_types/src/basis_points_16.rs
+++ b/crates/brk_types/src/basis_points_16.rs
@@ -164,9 +164,8 @@ impl std::fmt::Display for BasisPoints16 {
 
 impl Formattable for BasisPoints16 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/basis_points_32.rs b/crates/brk_types/src/basis_points_32.rs
index bed6c5921..ef4a26db7 100644
--- a/crates/brk_types/src/basis_points_32.rs
+++ b/crates/brk_types/src/basis_points_32.rs
@@ -137,9 +137,8 @@ impl std::fmt::Display for BasisPoints32 {
 
 impl Formattable for BasisPoints32 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/basis_points_signed_16.rs b/crates/brk_types/src/basis_points_signed_16.rs
index 65aaf06ec..532ce8ae0 100644
--- a/crates/brk_types/src/basis_points_signed_16.rs
+++ b/crates/brk_types/src/basis_points_signed_16.rs
@@ -160,9 +160,8 @@ impl std::fmt::Display for BasisPointsSigned16 {
 
 impl Formattable for BasisPointsSigned16 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/basis_points_signed_32.rs b/crates/brk_types/src/basis_points_signed_32.rs
index 12117b279..0926addeb 100644
--- a/crates/brk_types/src/basis_points_signed_32.rs
+++ b/crates/brk_types/src/basis_points_signed_32.rs
@@ -166,9 +166,8 @@ impl std::fmt::Display for BasisPointsSigned32 {
 
 impl Formattable for BasisPointsSigned32 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/bitcoin.rs b/crates/brk_types/src/bitcoin.rs
index 59965be5f..d77454327 100644
--- a/crates/brk_types/src/bitcoin.rs
+++ b/crates/brk_types/src/bitcoin.rs
@@ -143,9 +143,8 @@ impl std::fmt::Display for Bitcoin {
 
 impl Formattable for Bitcoin {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = ryu::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = ryu::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/blkposition.rs b/crates/brk_types/src/blkposition.rs
index 3f9658708..342b91db9 100644
--- a/crates/brk_types/src/blkposition.rs
+++ b/crates/brk_types/src/blkposition.rs
@@ -39,9 +39,8 @@ impl std::fmt::Display for BlkPosition {
 
 impl Formattable for BlkPosition {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/blockhash.rs b/crates/brk_types/src/blockhash.rs
index 922a86394..71dca3638 100644
--- a/crates/brk_types/src/blockhash.rs
+++ b/crates/brk_types/src/blockhash.rs
@@ -93,9 +93,16 @@ impl<'de> Deserialize<'de> for BlockHash {
 }
 
 impl Formattable for BlockHash {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
diff --git a/crates/brk_types/src/cents.rs b/crates/brk_types/src/cents.rs
index c37684346..d11f4ae3d 100644
--- a/crates/brk_types/src/cents.rs
+++ b/crates/brk_types/src/cents.rs
@@ -282,9 +282,8 @@ impl std::fmt::Display for Cents {
 
 impl Formattable for Cents {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/cents_sats.rs b/crates/brk_types/src/cents_sats.rs
index 01f94cb6b..2d2e2efe5 100644
--- a/crates/brk_types/src/cents_sats.rs
+++ b/crates/brk_types/src/cents_sats.rs
@@ -114,10 +114,9 @@ impl Div<usize> for CentsSats {
 
 impl Formattable for CentsSats {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
 
diff --git a/crates/brk_types/src/cents_signed.rs b/crates/brk_types/src/cents_signed.rs
index 15c5a8d52..f82d97e99 100644
--- a/crates/brk_types/src/cents_signed.rs
+++ b/crates/brk_types/src/cents_signed.rs
@@ -261,9 +261,8 @@ impl std::fmt::Display for CentsSigned {
 
 impl Formattable for CentsSigned {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/cents_squared_sats.rs b/crates/brk_types/src/cents_squared_sats.rs
index 007036f3c..9306fc8ed 100644
--- a/crates/brk_types/src/cents_squared_sats.rs
+++ b/crates/brk_types/src/cents_squared_sats.rs
@@ -109,10 +109,9 @@ impl Div<usize> for CentsSquaredSats {
 
 impl Formattable for CentsSquaredSats {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
 
diff --git a/crates/brk_types/src/date.rs b/crates/brk_types/src/date.rs
index 725f63900..485fd3a11 100644
--- a/crates/brk_types/src/date.rs
+++ b/crates/brk_types/src/date.rs
@@ -260,10 +260,17 @@ impl FromStr for Date {
 }
 
 impl Formattable for Date {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
 
diff --git a/crates/brk_types/src/day1.rs b/crates/brk_types/src/day1.rs
index 19587d2fd..6a754f55a 100644
--- a/crates/brk_types/src/day1.rs
+++ b/crates/brk_types/src/day1.rs
@@ -216,9 +216,8 @@ impl fmt::Display for Day1 {
 
 impl Formattable for Day1 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/day3.rs b/crates/brk_types/src/day3.rs
index 658d92254..2d701448c 100644
--- a/crates/brk_types/src/day3.rs
+++ b/crates/brk_types/src/day3.rs
@@ -81,9 +81,8 @@ impl std::fmt::Display for Day3 {
 
 impl Formattable for Day3 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/difficultyepoch.rs b/crates/brk_types/src/difficultyepoch.rs
index 206479b13..b3d07b555 100644
--- a/crates/brk_types/src/difficultyepoch.rs
+++ b/crates/brk_types/src/difficultyepoch.rs
@@ -110,10 +110,9 @@ impl std::fmt::Display for DifficultyEpoch {
 
 impl Formattable for DifficultyEpoch {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
 
diff --git a/crates/brk_types/src/dollars.rs b/crates/brk_types/src/dollars.rs
index 2832b7a8d..0f700f9e1 100644
--- a/crates/brk_types/src/dollars.rs
+++ b/crates/brk_types/src/dollars.rs
@@ -434,9 +434,8 @@ impl std::fmt::Display for Dollars {
 
 impl Formattable for Dollars {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = ryu::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = ryu::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/emptyaddressdata.rs b/crates/brk_types/src/emptyaddressdata.rs
index bc4594762..2da33adc7 100644
--- a/crates/brk_types/src/emptyaddressdata.rs
+++ b/crates/brk_types/src/emptyaddressdata.rs
@@ -49,16 +49,28 @@ impl std::fmt::Display for EmptyAddressData {
 }
 
 impl Formattable for EmptyAddressData {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
 
 impl Bytes for EmptyAddressData {
diff --git a/crates/brk_types/src/emptyaddressindex.rs b/crates/brk_types/src/emptyaddressindex.rs
index c5bbcfda3..18de6922b 100644
--- a/crates/brk_types/src/emptyaddressindex.rs
+++ b/crates/brk_types/src/emptyaddressindex.rs
@@ -82,7 +82,7 @@ impl std::fmt::Display for EmptyAddressIndex {
 
 impl Formattable for EmptyAddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/emptyoutputindex.rs b/crates/brk_types/src/emptyoutputindex.rs
index 562ffe975..75b88efa2 100644
--- a/crates/brk_types/src/emptyoutputindex.rs
+++ b/crates/brk_types/src/emptyoutputindex.rs
@@ -79,7 +79,7 @@ impl fmt::Display for EmptyOutputIndex {
 
 impl Formattable for EmptyOutputIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/feerate.rs b/crates/brk_types/src/feerate.rs
index 51c73b4d3..2a236f7f6 100644
--- a/crates/brk_types/src/feerate.rs
+++ b/crates/brk_types/src/feerate.rs
@@ -122,9 +122,8 @@ impl std::fmt::Display for FeeRate {
 
 impl Formattable for FeeRate {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = ryu::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = ryu::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/fundedaddressdata.rs b/crates/brk_types/src/fundedaddressdata.rs
index 6fe673471..b45421ff9 100644
--- a/crates/brk_types/src/fundedaddressdata.rs
+++ b/crates/brk_types/src/fundedaddressdata.rs
@@ -169,16 +169,28 @@ impl std::fmt::Display for FundedAddressData {
 }
 
 impl Formattable for FundedAddressData {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
 
 impl Bytes for FundedAddressData {
diff --git a/crates/brk_types/src/fundedaddressindex.rs b/crates/brk_types/src/fundedaddressindex.rs
index da82e8bfc..b3f1107ff 100644
--- a/crates/brk_types/src/fundedaddressindex.rs
+++ b/crates/brk_types/src/fundedaddressindex.rs
@@ -78,7 +78,7 @@ impl std::fmt::Display for FundedAddressIndex {
 
 impl Formattable for FundedAddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/halvingepoch.rs b/crates/brk_types/src/halvingepoch.rs
index 4e8fb78b2..205ecbb78 100644
--- a/crates/brk_types/src/halvingepoch.rs
+++ b/crates/brk_types/src/halvingepoch.rs
@@ -116,10 +116,9 @@ impl std::fmt::Display for HalvingEpoch {
 
 impl Formattable for HalvingEpoch {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
 
diff --git a/crates/brk_types/src/height.rs b/crates/brk_types/src/height.rs
index b8887f172..25cdbc94b 100644
--- a/crates/brk_types/src/height.rs
+++ b/crates/brk_types/src/height.rs
@@ -286,10 +286,9 @@ impl std::fmt::Display for Height {
 
 impl Formattable for Height {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
 
diff --git a/crates/brk_types/src/hour1.rs b/crates/brk_types/src/hour1.rs
index 03a05c0fe..1088365d3 100644
--- a/crates/brk_types/src/hour1.rs
+++ b/crates/brk_types/src/hour1.rs
@@ -81,9 +81,8 @@ impl std::fmt::Display for Hour1 {
 
 impl Formattable for Hour1 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/hour12.rs b/crates/brk_types/src/hour12.rs
index 9e110afde..6dc33fcf7 100644
--- a/crates/brk_types/src/hour12.rs
+++ b/crates/brk_types/src/hour12.rs
@@ -81,9 +81,8 @@ impl std::fmt::Display for Hour12 {
 
 impl Formattable for Hour12 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/hour4.rs b/crates/brk_types/src/hour4.rs
index 4b58d8b51..198cfe054 100644
--- a/crates/brk_types/src/hour4.rs
+++ b/crates/brk_types/src/hour4.rs
@@ -81,9 +81,8 @@ impl std::fmt::Display for Hour4 {
 
 impl Formattable for Hour4 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/minute10.rs b/crates/brk_types/src/minute10.rs
index d1b882da1..531933ed4 100644
--- a/crates/brk_types/src/minute10.rs
+++ b/crates/brk_types/src/minute10.rs
@@ -81,9 +81,8 @@ impl std::fmt::Display for Minute10 {
 
 impl Formattable for Minute10 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/minute30.rs b/crates/brk_types/src/minute30.rs
index fd3fe6fd1..251291b85 100644
--- a/crates/brk_types/src/minute30.rs
+++ b/crates/brk_types/src/minute30.rs
@@ -81,9 +81,8 @@ impl std::fmt::Display for Minute30 {
 
 impl Formattable for Minute30 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/month1.rs b/crates/brk_types/src/month1.rs
index df6fc6290..2181e3389 100644
--- a/crates/brk_types/src/month1.rs
+++ b/crates/brk_types/src/month1.rs
@@ -135,9 +135,8 @@ impl std::fmt::Display for Month1 {
 
 impl Formattable for Month1 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/month3.rs b/crates/brk_types/src/month3.rs
index e2be587df..ddbb45626 100644
--- a/crates/brk_types/src/month3.rs
+++ b/crates/brk_types/src/month3.rs
@@ -129,9 +129,8 @@ impl std::fmt::Display for Month3 {
 
 impl Formattable for Month3 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/month6.rs b/crates/brk_types/src/month6.rs
index ba9268788..b256d1552 100644
--- a/crates/brk_types/src/month6.rs
+++ b/crates/brk_types/src/month6.rs
@@ -121,9 +121,8 @@ impl std::fmt::Display for Month6 {
 
 impl Formattable for Month6 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/ohlc.rs b/crates/brk_types/src/ohlc.rs
index bee8089be..54ba7fef2 100644
--- a/crates/brk_types/src/ohlc.rs
+++ b/crates/brk_types/src/ohlc.rs
@@ -128,16 +128,28 @@ impl Display for OHLCCents {
 }
 
 impl Formattable for OHLCCents {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
 
 impl Bytes for OHLCCents {
@@ -259,16 +271,28 @@ impl Display for OHLCDollars {
 }
 
 impl Formattable for OHLCDollars {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
 
 impl Bytes for OHLCDollars {
@@ -359,16 +383,28 @@ impl Display for OHLCSats {
 }
 
 impl Formattable for OHLCSats {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
 
 impl Bytes for OHLCSats {
@@ -518,10 +554,17 @@ impl<T> Formattable for Open<T>
 where
     T: Display,
 {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
 
@@ -650,10 +693,17 @@ impl<T> Formattable for High<T>
 where
     T: Display,
 {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
 
@@ -782,10 +832,17 @@ impl<T> Formattable for Low<T>
 where
     T: Display,
 {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
 
@@ -937,9 +994,16 @@ impl<T> Formattable for Close<T>
 where
     T: Display,
 {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
diff --git a/crates/brk_types/src/opreturnindex.rs b/crates/brk_types/src/opreturnindex.rs
index 9f35d5ca8..ab632036f 100644
--- a/crates/brk_types/src/opreturnindex.rs
+++ b/crates/brk_types/src/opreturnindex.rs
@@ -84,7 +84,7 @@ impl std::fmt::Display for OpReturnIndex {
 
 impl Formattable for OpReturnIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/oracle_bins.rs b/crates/brk_types/src/oracle_bins.rs
index 01391b86d..85b49b2d9 100644
--- a/crates/brk_types/src/oracle_bins.rs
+++ b/crates/brk_types/src/oracle_bins.rs
@@ -144,10 +144,17 @@ impl Bytes for OracleBins {
 }
 
 impl Formattable for OracleBins {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
 
@@ -300,9 +307,16 @@ impl Bytes for OracleBinsV2 {
 }
 
 impl Formattable for OracleBinsV2 {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
diff --git a/crates/brk_types/src/outpoint.rs b/crates/brk_types/src/outpoint.rs
index 4308c192c..7393c8c3b 100644
--- a/crates/brk_types/src/outpoint.rs
+++ b/crates/brk_types/src/outpoint.rs
@@ -47,16 +47,28 @@ impl std::fmt::Display for OutPoint {
 }
 
 impl Formattable for OutPoint {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
 
 impl Serialize for OutPoint {
diff --git a/crates/brk_types/src/outputtype.rs b/crates/brk_types/src/outputtype.rs
index 65bb19989..77a89b4b0 100644
--- a/crates/brk_types/src/outputtype.rs
+++ b/crates/brk_types/src/outputtype.rs
@@ -205,10 +205,17 @@ impl TryFrom<OutputType> for AddressType {
 }
 
 impl Formattable for OutputType {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
 
diff --git a/crates/brk_types/src/p2aaddressindex.rs b/crates/brk_types/src/p2aaddressindex.rs
index fb3ea8caf..0a89fa8c2 100644
--- a/crates/brk_types/src/p2aaddressindex.rs
+++ b/crates/brk_types/src/p2aaddressindex.rs
@@ -105,7 +105,7 @@ impl std::fmt::Display for P2AAddressIndex {
 
 impl Formattable for P2AAddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/p2abytes.rs b/crates/brk_types/src/p2abytes.rs
index 1c1acff68..56b61350c 100644
--- a/crates/brk_types/src/p2abytes.rs
+++ b/crates/brk_types/src/p2abytes.rs
@@ -44,14 +44,26 @@ impl fmt::Display for P2ABytes {
 }
 
 impl Formattable for P2ABytes {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
diff --git a/crates/brk_types/src/p2msoutputindex.rs b/crates/brk_types/src/p2msoutputindex.rs
index 63b4c8534..5b228ad83 100644
--- a/crates/brk_types/src/p2msoutputindex.rs
+++ b/crates/brk_types/src/p2msoutputindex.rs
@@ -84,7 +84,7 @@ impl std::fmt::Display for P2MSOutputIndex {
 
 impl Formattable for P2MSOutputIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/p2pk33addressindex.rs b/crates/brk_types/src/p2pk33addressindex.rs
index 4ad20f765..9eba5f2de 100644
--- a/crates/brk_types/src/p2pk33addressindex.rs
+++ b/crates/brk_types/src/p2pk33addressindex.rs
@@ -105,7 +105,7 @@ impl std::fmt::Display for P2PK33AddressIndex {
 
 impl Formattable for P2PK33AddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/p2pk33bytes.rs b/crates/brk_types/src/p2pk33bytes.rs
index 9f7bd9e52..19fd5af2a 100644
--- a/crates/brk_types/src/p2pk33bytes.rs
+++ b/crates/brk_types/src/p2pk33bytes.rs
@@ -44,14 +44,26 @@ impl fmt::Display for P2PK33Bytes {
 }
 
 impl Formattable for P2PK33Bytes {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
diff --git a/crates/brk_types/src/p2pk65addressindex.rs b/crates/brk_types/src/p2pk65addressindex.rs
index cbc6899b3..515d93c87 100644
--- a/crates/brk_types/src/p2pk65addressindex.rs
+++ b/crates/brk_types/src/p2pk65addressindex.rs
@@ -104,7 +104,7 @@ impl std::fmt::Display for P2PK65AddressIndex {
 
 impl Formattable for P2PK65AddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/p2pk65bytes.rs b/crates/brk_types/src/p2pk65bytes.rs
index 70bd5ef93..0faf55eb9 100644
--- a/crates/brk_types/src/p2pk65bytes.rs
+++ b/crates/brk_types/src/p2pk65bytes.rs
@@ -44,14 +44,26 @@ impl fmt::Display for P2PK65Bytes {
 }
 
 impl Formattable for P2PK65Bytes {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
diff --git a/crates/brk_types/src/p2pkhaddressindex.rs b/crates/brk_types/src/p2pkhaddressindex.rs
index d2a490098..65508aec8 100644
--- a/crates/brk_types/src/p2pkhaddressindex.rs
+++ b/crates/brk_types/src/p2pkhaddressindex.rs
@@ -105,7 +105,7 @@ impl std::fmt::Display for P2PKHAddressIndex {
 
 impl Formattable for P2PKHAddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/p2pkhbytes.rs b/crates/brk_types/src/p2pkhbytes.rs
index 12cc13e03..77807cc4e 100644
--- a/crates/brk_types/src/p2pkhbytes.rs
+++ b/crates/brk_types/src/p2pkhbytes.rs
@@ -44,14 +44,26 @@ impl fmt::Display for P2PKHBytes {
 }
 
 impl Formattable for P2PKHBytes {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
diff --git a/crates/brk_types/src/p2shaddressindex.rs b/crates/brk_types/src/p2shaddressindex.rs
index 4c34be532..08aa0e788 100644
--- a/crates/brk_types/src/p2shaddressindex.rs
+++ b/crates/brk_types/src/p2shaddressindex.rs
@@ -112,7 +112,7 @@ impl std::fmt::Display for P2SHAddressIndex {
 
 impl Formattable for P2SHAddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/p2shbytes.rs b/crates/brk_types/src/p2shbytes.rs
index ae8c04276..56fac3024 100644
--- a/crates/brk_types/src/p2shbytes.rs
+++ b/crates/brk_types/src/p2shbytes.rs
@@ -44,14 +44,26 @@ impl fmt::Display for P2SHBytes {
 }
 
 impl Formattable for P2SHBytes {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
diff --git a/crates/brk_types/src/p2traddressindex.rs b/crates/brk_types/src/p2traddressindex.rs
index 9bdf01122..ff9df5fc5 100644
--- a/crates/brk_types/src/p2traddressindex.rs
+++ b/crates/brk_types/src/p2traddressindex.rs
@@ -105,7 +105,7 @@ impl std::fmt::Display for P2TRAddressIndex {
 
 impl Formattable for P2TRAddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/p2trbytes.rs b/crates/brk_types/src/p2trbytes.rs
index 2cfc8d05e..d29f56a1f 100644
--- a/crates/brk_types/src/p2trbytes.rs
+++ b/crates/brk_types/src/p2trbytes.rs
@@ -44,14 +44,26 @@ impl fmt::Display for P2TRBytes {
 }
 
 impl Formattable for P2TRBytes {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
diff --git a/crates/brk_types/src/p2wpkhaddressindex.rs b/crates/brk_types/src/p2wpkhaddressindex.rs
index 8d227d0d3..7c58e7e49 100644
--- a/crates/brk_types/src/p2wpkhaddressindex.rs
+++ b/crates/brk_types/src/p2wpkhaddressindex.rs
@@ -105,7 +105,7 @@ impl std::fmt::Display for P2WPKHAddressIndex {
 
 impl Formattable for P2WPKHAddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/p2wpkhbytes.rs b/crates/brk_types/src/p2wpkhbytes.rs
index 9968201b1..da419e337 100644
--- a/crates/brk_types/src/p2wpkhbytes.rs
+++ b/crates/brk_types/src/p2wpkhbytes.rs
@@ -44,14 +44,26 @@ impl fmt::Display for P2WPKHBytes {
 }
 
 impl Formattable for P2WPKHBytes {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
diff --git a/crates/brk_types/src/p2wshaddressindex.rs b/crates/brk_types/src/p2wshaddressindex.rs
index 163e5952e..4b116d04e 100644
--- a/crates/brk_types/src/p2wshaddressindex.rs
+++ b/crates/brk_types/src/p2wshaddressindex.rs
@@ -105,7 +105,7 @@ impl std::fmt::Display for P2WSHAddressIndex {
 
 impl Formattable for P2WSHAddressIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/p2wshbytes.rs b/crates/brk_types/src/p2wshbytes.rs
index 5f11a85bf..4b3dcb7d5 100644
--- a/crates/brk_types/src/p2wshbytes.rs
+++ b/crates/brk_types/src/p2wshbytes.rs
@@ -44,14 +44,26 @@ impl fmt::Display for P2WSHBytes {
 }
 
 impl Formattable for P2WSHBytes {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
diff --git a/crates/brk_types/src/pairoutputindex.rs b/crates/brk_types/src/pairoutputindex.rs
index f7a403256..54442eb94 100644
--- a/crates/brk_types/src/pairoutputindex.rs
+++ b/crates/brk_types/src/pairoutputindex.rs
@@ -115,9 +115,8 @@ impl std::fmt::Display for PairOutputIndex {
 
 impl Formattable for PairOutputIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/poolslug.rs b/crates/brk_types/src/poolslug.rs
index 70c0052da..4f5aadc39 100644
--- a/crates/brk_types/src/poolslug.rs
+++ b/crates/brk_types/src/poolslug.rs
@@ -410,10 +410,17 @@ impl PoolSlug {
 }
 
 impl Formattable for PoolSlug {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
 
diff --git a/crates/brk_types/src/rawlocktime.rs b/crates/brk_types/src/rawlocktime.rs
index a61576e1c..9dbf8b851 100644
--- a/crates/brk_types/src/rawlocktime.rs
+++ b/crates/brk_types/src/rawlocktime.rs
@@ -38,14 +38,26 @@ impl std::fmt::Display for RawLockTime {
 }
 
 impl Formattable for RawLockTime {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
diff --git a/crates/brk_types/src/sats.rs b/crates/brk_types/src/sats.rs
index d354f9bb6..86f0bab97 100644
--- a/crates/brk_types/src/sats.rs
+++ b/crates/brk_types/src/sats.rs
@@ -346,9 +346,8 @@ impl std::fmt::Display for Sats {
 
 impl Formattable for Sats {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/sats_signed.rs b/crates/brk_types/src/sats_signed.rs
index e975c81ca..2309af00c 100644
--- a/crates/brk_types/src/sats_signed.rs
+++ b/crates/brk_types/src/sats_signed.rs
@@ -214,9 +214,8 @@ impl std::fmt::Display for SatsSigned {
 
 impl Formattable for SatsSigned {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/satsfract.rs b/crates/brk_types/src/satsfract.rs
index 061e8ea5e..8e8420aac 100644
--- a/crates/brk_types/src/satsfract.rs
+++ b/crates/brk_types/src/satsfract.rs
@@ -188,10 +188,9 @@ impl std::fmt::Display for SatsFract {
 
 impl Formattable for SatsFract {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = ryu::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = ryu::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
 
diff --git a/crates/brk_types/src/stored_bool.rs b/crates/brk_types/src/stored_bool.rs
index 4d7c8fe5b..2f2b41321 100644
--- a/crates/brk_types/src/stored_bool.rs
+++ b/crates/brk_types/src/stored_bool.rs
@@ -70,8 +70,7 @@ impl std::fmt::Display for StoredBool {
 
 impl Formattable for StoredBool {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        f.push_str(if self.is_true() { "true" } else { "false" });
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        buf.extend_from_slice(if self.is_true() { b"true" } else { b"false" });
     }
 }
diff --git a/crates/brk_types/src/stored_f32.rs b/crates/brk_types/src/stored_f32.rs
index d466838a2..c7987e398 100644
--- a/crates/brk_types/src/stored_f32.rs
+++ b/crates/brk_types/src/stored_f32.rs
@@ -273,9 +273,8 @@ impl std::fmt::Display for StoredF32 {
 
 impl Formattable for StoredF32 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = ryu::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = ryu::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/stored_f64.rs b/crates/brk_types/src/stored_f64.rs
index 0ba6f7469..2c66347bc 100644
--- a/crates/brk_types/src/stored_f64.rs
+++ b/crates/brk_types/src/stored_f64.rs
@@ -246,9 +246,8 @@ impl std::fmt::Display for StoredF64 {
 
 impl Formattable for StoredF64 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = ryu::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = ryu::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/stored_i16.rs b/crates/brk_types/src/stored_i16.rs
index b4912c539..24a5593a1 100644
--- a/crates/brk_types/src/stored_i16.rs
+++ b/crates/brk_types/src/stored_i16.rs
@@ -117,9 +117,8 @@ impl std::fmt::Display for StoredI16 {
 
 impl Formattable for StoredI16 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/stored_i64.rs b/crates/brk_types/src/stored_i64.rs
index d185100d2..7c49f8e95 100644
--- a/crates/brk_types/src/stored_i64.rs
+++ b/crates/brk_types/src/stored_i64.rs
@@ -132,9 +132,8 @@ impl std::fmt::Display for StoredI64 {
 
 impl Formattable for StoredI64 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/stored_i8.rs b/crates/brk_types/src/stored_i8.rs
index 2b641ad27..87dbd1f9d 100644
--- a/crates/brk_types/src/stored_i8.rs
+++ b/crates/brk_types/src/stored_i8.rs
@@ -117,9 +117,8 @@ impl std::fmt::Display for StoredI8 {
 
 impl Formattable for StoredI8 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/stored_u16.rs b/crates/brk_types/src/stored_u16.rs
index d75b722ee..a4a3f9dee 100644
--- a/crates/brk_types/src/stored_u16.rs
+++ b/crates/brk_types/src/stored_u16.rs
@@ -208,9 +208,8 @@ impl std::fmt::Display for StoredU16 {
 
 impl Formattable for StoredU16 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/stored_u32.rs b/crates/brk_types/src/stored_u32.rs
index 09bd8282c..8d35f2e23 100644
--- a/crates/brk_types/src/stored_u32.rs
+++ b/crates/brk_types/src/stored_u32.rs
@@ -260,9 +260,8 @@ impl std::fmt::Display for StoredU32 {
 
 impl Formattable for StoredU32 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/stored_u64.rs b/crates/brk_types/src/stored_u64.rs
index af0f851bd..057c32387 100644
--- a/crates/brk_types/src/stored_u64.rs
+++ b/crates/brk_types/src/stored_u64.rs
@@ -275,9 +275,8 @@ impl std::fmt::Display for StoredU64 {
 
 impl Formattable for StoredU64 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/stored_u8.rs b/crates/brk_types/src/stored_u8.rs
index 25b543e5b..2b932d045 100644
--- a/crates/brk_types/src/stored_u8.rs
+++ b/crates/brk_types/src/stored_u8.rs
@@ -108,9 +108,8 @@ impl std::fmt::Display for StoredU8 {
 
 impl Formattable for StoredU8 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/supply_state.rs b/crates/brk_types/src/supply_state.rs
index 4da00ecd4..f322d5ecd 100644
--- a/crates/brk_types/src/supply_state.rs
+++ b/crates/brk_types/src/supply_state.rs
@@ -82,16 +82,28 @@ impl fmt::Display for SupplyState {
 }
 
 impl Formattable for SupplyState {
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
         let start = f.len();
-        write!(f, "{}", self)?;
+        self.fmt_into(f);
         if f.as_bytes()[start..].contains(&b',') {
             f.insert(start, '"');
             f.push('"');
         }
         Ok(())
     }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
+    }
 }
 
 impl Bytes for SupplyState {
diff --git a/crates/brk_types/src/timestamp.rs b/crates/brk_types/src/timestamp.rs
index 55c2cd594..80655bd90 100644
--- a/crates/brk_types/src/timestamp.rs
+++ b/crates/brk_types/src/timestamp.rs
@@ -189,9 +189,8 @@ impl std::fmt::Display for Timestamp {
 
 impl Formattable for Timestamp {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/txid.rs b/crates/brk_types/src/txid.rs
index 173f6881f..82e1562af 100644
--- a/crates/brk_types/src/txid.rs
+++ b/crates/brk_types/src/txid.rs
@@ -84,9 +84,16 @@ impl<'de> Deserialize<'de> for Txid {
 }
 
 impl Formattable for Txid {
-    #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
+    fn write_to(&self, buf: &mut Vec<u8>) {
         use std::fmt::Write;
-        write!(f, "{}", self)
+        let mut s = String::new();
+        write!(s, "{}", self).unwrap();
+        buf.extend_from_slice(s.as_bytes());
+    }
+
+    fn fmt_json(&self, buf: &mut Vec<u8>) {
+        buf.push(b'"');
+        self.write_to(buf);
+        buf.push(b'"');
     }
 }
diff --git a/crates/brk_types/src/txindex.rs b/crates/brk_types/src/txindex.rs
index 4d8a9f835..28832cad5 100644
--- a/crates/brk_types/src/txindex.rs
+++ b/crates/brk_types/src/txindex.rs
@@ -170,9 +170,8 @@ impl std::fmt::Display for TxIndex {
 
 impl Formattable for TxIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/txinindex.rs b/crates/brk_types/src/txinindex.rs
index b7df41ffb..24a0c5ffe 100644
--- a/crates/brk_types/src/txinindex.rs
+++ b/crates/brk_types/src/txinindex.rs
@@ -131,9 +131,8 @@ impl std::fmt::Display for TxInIndex {
 
 impl Formattable for TxInIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/txoutindex.rs b/crates/brk_types/src/txoutindex.rs
index e5e60a28a..2c40855ba 100644
--- a/crates/brk_types/src/txoutindex.rs
+++ b/crates/brk_types/src/txoutindex.rs
@@ -132,9 +132,8 @@ impl std::fmt::Display for TxOutIndex {
 
 impl Formattable for TxOutIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/txversion.rs b/crates/brk_types/src/txversion.rs
index d2f2111ec..a11a1c2ae 100644
--- a/crates/brk_types/src/txversion.rs
+++ b/crates/brk_types/src/txversion.rs
@@ -65,9 +65,8 @@ impl std::fmt::Display for TxVersion {
 
 impl Formattable for TxVersion {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/typeindex.rs b/crates/brk_types/src/typeindex.rs
index 3b6a7be88..81f9a12cd 100644
--- a/crates/brk_types/src/typeindex.rs
+++ b/crates/brk_types/src/typeindex.rs
@@ -147,9 +147,8 @@ impl std::fmt::Display for TypeIndex {
 
 impl Formattable for TypeIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/unknownoutputindex.rs b/crates/brk_types/src/unknownoutputindex.rs
index ddf58fe93..dbef942f0 100644
--- a/crates/brk_types/src/unknownoutputindex.rs
+++ b/crates/brk_types/src/unknownoutputindex.rs
@@ -79,7 +79,7 @@ impl std::fmt::Display for UnknownOutputIndex {
 
 impl Formattable for UnknownOutputIndex {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        self.0.fmt_csv(f)
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        self.0.write_to(buf);
     }
 }
diff --git a/crates/brk_types/src/vout.rs b/crates/brk_types/src/vout.rs
index 6fb0fdf64..ffba19f48 100644
--- a/crates/brk_types/src/vout.rs
+++ b/crates/brk_types/src/vout.rs
@@ -98,9 +98,8 @@ impl std::fmt::Display for Vout {
 
 impl Formattable for Vout {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/vsize.rs b/crates/brk_types/src/vsize.rs
index bc15897b0..fec226b09 100644
--- a/crates/brk_types/src/vsize.rs
+++ b/crates/brk_types/src/vsize.rs
@@ -121,9 +121,8 @@ impl std::fmt::Display for VSize {
 
 impl Formattable for VSize {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/week1.rs b/crates/brk_types/src/week1.rs
index 001e85e08..5886d3967 100644
--- a/crates/brk_types/src/week1.rs
+++ b/crates/brk_types/src/week1.rs
@@ -145,9 +145,8 @@ impl std::fmt::Display for Week1 {
 
 impl Formattable for Week1 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/weight.rs b/crates/brk_types/src/weight.rs
index f53f5d2a2..83332452c 100644
--- a/crates/brk_types/src/weight.rs
+++ b/crates/brk_types/src/weight.rs
@@ -137,9 +137,8 @@ impl std::fmt::Display for Weight {
 
 impl Formattable for Weight {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/year.rs b/crates/brk_types/src/year.rs
index 0072722b5..4c34a3d6f 100644
--- a/crates/brk_types/src/year.rs
+++ b/crates/brk_types/src/year.rs
@@ -124,9 +124,8 @@ impl std::fmt::Display for Year {
 
 impl Formattable for Year {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/year1.rs b/crates/brk_types/src/year1.rs
index 9ba687c4b..b27cbc789 100644
--- a/crates/brk_types/src/year1.rs
+++ b/crates/brk_types/src/year1.rs
@@ -142,9 +142,8 @@ impl std::fmt::Display for Year1 {
 
 impl Formattable for Year1 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }
diff --git a/crates/brk_types/src/year10.rs b/crates/brk_types/src/year10.rs
index 2a3565c15..8aad0843d 100644
--- a/crates/brk_types/src/year10.rs
+++ b/crates/brk_types/src/year10.rs
@@ -144,9 +144,8 @@ impl std::fmt::Display for Year10 {
 
 impl Formattable for Year10 {
     #[inline(always)]
-    fn fmt_csv(&self, f: &mut String) -> std::fmt::Result {
-        let mut buf = itoa::Buffer::new();
-        f.push_str(buf.format(self.0));
-        Ok(())
+    fn write_to(&self, buf: &mut Vec<u8>) {
+        let mut b = itoa::Buffer::new();
+        buf.extend_from_slice(b.format(self.0).as_bytes());
     }
 }