diff --git a/crates/brk_server/src/api/mempool_space/addrs.rs b/crates/brk_server/src/api/addrs.rs
similarity index 100%
rename from crates/brk_server/src/api/mempool_space/addrs.rs
rename to crates/brk_server/src/api/addrs.rs
diff --git a/crates/brk_server/src/api/mempool_space/blocks.rs b/crates/brk_server/src/api/blocks.rs
similarity index 100%
rename from crates/brk_server/src/api/mempool_space/blocks.rs
rename to crates/brk_server/src/api/blocks.rs
diff --git a/crates/brk_server/src/api/mempool_space/fees.rs b/crates/brk_server/src/api/fees.rs
similarity index 100%
rename from crates/brk_server/src/api/mempool_space/fees.rs
rename to crates/brk_server/src/api/fees.rs
diff --git a/crates/brk_server/src/api/mempool_space/general.rs b/crates/brk_server/src/api/general.rs
similarity index 100%
rename from crates/brk_server/src/api/mempool_space/general.rs
rename to crates/brk_server/src/api/general.rs
diff --git a/crates/brk_server/src/api/mempool_space/mempool.rs b/crates/brk_server/src/api/mempool.rs
similarity index 100%
rename from crates/brk_server/src/api/mempool_space/mempool.rs
rename to crates/brk_server/src/api/mempool.rs
diff --git a/crates/brk_server/src/api/mempool_space/mod.rs b/crates/brk_server/src/api/mempool_space/mod.rs
deleted file mode 100644
index df68ff1de..000000000
--- a/crates/brk_server/src/api/mempool_space/mod.rs
+++ /dev/null
@@ -1,35 +0,0 @@
-use aide::axum::ApiRouter;
-
-use crate::AppState;
-
-mod addrs;
-mod blocks;
-mod fees;
-mod general;
-mod mempool;
-mod mining;
-mod transactions;
-
-use addrs::AddrRoutes;
-use blocks::BlockRoutes;
-use fees::FeesRoutes;
-use general::GeneralRoutes;
-use mempool::MempoolRoutes;
-use mining::MiningRoutes;
-use transactions::TxRoutes;
-
-pub trait MempoolSpaceRoutes {
-    fn add_mempool_space_routes(self) -> Self;
-}
-
-impl MempoolSpaceRoutes for ApiRouter<AppState> {
-    fn add_mempool_space_routes(self) -> Self {
-        self.add_general_routes()
-            .add_addr_routes()
-            .add_block_routes()
-            .add_mining_routes()
-            .add_fees_routes()
-            .add_mempool_routes()
-            .add_tx_routes()
-    }
-}
diff --git a/crates/brk_server/src/api/metrics/mod.rs b/crates/brk_server/src/api/metrics.rs
similarity index 100%
rename from crates/brk_server/src/api/metrics/mod.rs
rename to crates/brk_server/src/api/metrics.rs
diff --git a/crates/brk_server/src/api/mempool_space/mining.rs b/crates/brk_server/src/api/mining.rs
similarity index 100%
rename from crates/brk_server/src/api/mempool_space/mining.rs
rename to crates/brk_server/src/api/mining.rs
diff --git a/crates/brk_server/src/api/mod.rs b/crates/brk_server/src/api/mod.rs
index 90d3c5f5f..2c27f1093 100644
--- a/crates/brk_server/src/api/mod.rs
+++ b/crates/brk_server/src/api/mod.rs
@@ -14,24 +14,36 @@ use axum::{
 use crate::{
     Error,
     api::{
-        mempool_space::MempoolSpaceRoutes, metrics::ApiMetricsLegacyRoutes,
-        series::ApiSeriesRoutes, series_legacy::ApiSeriesLegacyRoutes, server::ServerRoutes,
-        urpd::ApiUrpdRoutes,
+        metrics::ApiMetricsLegacyRoutes, series::ApiSeriesRoutes,
+        series_legacy::ApiSeriesLegacyRoutes, server::ServerRoutes, urpd::ApiUrpdRoutes,
     },
     extended::{ResponseExtended, TransformResponseExtended},
 };
 
 use super::AppState;
 
-mod mempool_space;
+mod addrs;
+mod blocks;
+mod fees;
+mod general;
+mod mempool;
 mod metrics;
+mod mining;
 mod openapi;
 mod series;
 mod series_legacy;
 mod server;
+mod transactions;
 mod urpd;
 
+use addrs::AddrRoutes;
+use blocks::BlockRoutes;
+use fees::FeesRoutes;
+use general::GeneralRoutes;
+use mempool::MempoolRoutes;
+use mining::MiningRoutes;
 pub use openapi::*;
+use transactions::TxRoutes;
 
 pub trait ApiRoutes {
     fn add_api_routes(self) -> Self;
@@ -44,7 +56,13 @@ impl ApiRoutes for ApiRouter<AppState> {
             .add_series_legacy_routes()
             .add_urpd_routes()
             .add_metrics_legacy_routes()
-            .add_mempool_space_routes()
+            .add_general_routes()
+            .add_addr_routes()
+            .add_block_routes()
+            .add_mining_routes()
+            .add_fees_routes()
+            .add_mempool_routes()
+            .add_tx_routes()
             .route("/api/server", get(Redirect::temporary("/api#tag/server")))
             .api_route(
                 "/openapi.json",
diff --git a/crates/brk_server/src/api/server/mod.rs b/crates/brk_server/src/api/server.rs
similarity index 100%
rename from crates/brk_server/src/api/server/mod.rs
rename to crates/brk_server/src/api/server.rs
diff --git a/crates/brk_server/src/api/mempool_space/transactions.rs b/crates/brk_server/src/api/transactions.rs
similarity index 100%
rename from crates/brk_server/src/api/mempool_space/transactions.rs
rename to crates/brk_server/src/api/transactions.rs
diff --git a/crates/brk_server/src/api/urpd/mod.rs b/crates/brk_server/src/api/urpd.rs
similarity index 100%
rename from crates/brk_server/src/api/urpd/mod.rs
rename to crates/brk_server/src/api/urpd.rs
diff --git a/crates/brk_server/src/cache/mod.rs b/crates/brk_server/src/cache/mod.rs
index f31385a9f..1c8658da9 100644
--- a/crates/brk_server/src/cache/mod.rs
+++ b/crates/brk_server/src/cache/mod.rs
@@ -17,4 +17,3 @@ pub use params::CacheParams;
 pub use strategy::CacheStrategy;
 
 pub(crate) use mode::init;
-pub(crate) use params::CC_ERROR;
diff --git a/crates/brk_server/src/cache/params.rs b/crates/brk_server/src/cache/params.rs
index f19967f4a..e2b04e0da 100644
--- a/crates/brk_server/src/cache/params.rs
+++ b/crates/brk_server/src/cache/params.rs
@@ -14,7 +14,7 @@ const CC: &str = "public, no-cache, stale-if-error=86400";
 
 // Errors: short, must-revalidate, no `stale-if-error` (we don't want a 24h-old
 // error served when origin recovers). Same string for browser and CDN.
-pub(crate) const CC_ERROR: &str = "public, max-age=1, must-revalidate";
+const CC_ERROR: &str = "public, max-age=1, must-revalidate";
 
 /// Resolved cache parameters: an ETag plus the two Cache-Control directives.
 pub struct CacheParams {
@@ -97,6 +97,13 @@ impl CacheParams {
         }
     }
 
+    /// Apply error cache-control headers without an ETag. Used for synthesized
+    /// errors (panics, fallback handlers) that have no resource etag.
+    pub fn apply_error_cache_control(headers: &mut HeaderMap) {
+        headers.insert_cache_control(CC_ERROR);
+        headers.insert_cdn_cache_control(CC_ERROR);
+    }
+
     pub fn matches_etag(&self, headers: &HeaderMap) -> bool {
         headers.has_etag(self.etag.as_str())
     }
diff --git a/crates/brk_server/src/error.rs b/crates/brk_server/src/error.rs
index 81d917f3f..7e406c400 100644
--- a/crates/brk_server/src/error.rs
+++ b/crates/brk_server/src/error.rs
@@ -7,11 +7,7 @@ use brk_error::Error as BrkError;
 use schemars::JsonSchema;
 use serde::Serialize;
 
-use crate::{
-    cache::{CC_ERROR, CacheParams},
-    etag::Etag,
-    extended::HeaderMapExtended,
-};
+use crate::{cache::CacheParams, etag::Etag};
 
 /// Server result type with Error that implements IntoResponse.
 pub type Result<T> = std::result::Result<T, Error>;
@@ -145,7 +141,13 @@ impl Error {
 
     pub(crate) fn into_response_with_etag(self, etag: Etag) -> Response {
         let params = CacheParams::error(etag);
-        let mut response = self.into_response();
+        let body = build_error_body(self.status, self.code, self.message);
+        let mut response = (
+            self.status,
+            [(header::CONTENT_TYPE, "application/problem+json")],
+            body,
+        )
+            .into_response();
         params.apply_to(response.headers_mut());
         response
     }
@@ -174,9 +176,7 @@ impl IntoResponse for Error {
             body,
         )
             .into_response();
-        let h = response.headers_mut();
-        h.insert_cache_control(CC_ERROR);
-        h.insert_cdn_cache_control(CC_ERROR);
+        CacheParams::apply_error_cache_control(response.headers_mut());
         response
     }
 }
diff --git a/crates/brk_server/src/params/limit_param.rs b/crates/brk_server/src/params/limit_param.rs
deleted file mode 100644
index 295107f01..000000000
--- a/crates/brk_server/src/params/limit_param.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-use schemars::JsonSchema;
-use serde::Deserialize;
-
-use brk_types::Limit;
-
-#[derive(Deserialize, JsonSchema)]
-pub struct LimitParam {
-    #[serde(default)]
-    pub limit: Limit,
-}
diff --git a/crates/brk_server/src/params/mod.rs b/crates/brk_server/src/params/mod.rs
index f38cb67fd..e62bc6c3b 100644
--- a/crates/brk_server/src/params/mod.rs
+++ b/crates/brk_server/src/params/mod.rs
@@ -5,7 +5,6 @@ mod blockhash_param;
 mod blockhash_start_index;
 mod blockhash_tx_index;
 mod height_param;
-mod limit_param;
 mod pool_slug_param;
 mod series_param;
 mod time_period_param;
@@ -24,7 +23,6 @@ pub use blockhash_param::*;
 pub use blockhash_start_index::*;
 pub use blockhash_tx_index::*;
 pub use height_param::*;
-pub use limit_param::*;
 pub use pool_slug_param::*;
 pub use series_param::*;
 pub use time_period_param::*;