diff --git a/mev-rs/src/blinded_block_provider/api/server.rs b/mev-rs/src/blinded_block_provider/api/server.rs
index 9a38d02e..98505f76 100644
--- a/mev-rs/src/blinded_block_provider/api/server.rs
+++ b/mev-rs/src/blinded_block_provider/api/server.rs
@@ -2,7 +2,7 @@ use crate::{
     blinded_block_provider::BlindedBlockProvider,
     error::Error,
     types::{
-        bellatrix, capella, BidRequest, ExecutionPayload, SignedBlindedBeaconBlock,
+        bellatrix, capella, deneb, BidRequest, ExecutionPayload, SignedBlindedBeaconBlock,
         SignedBuilderBid, SignedValidatorRegistration,
     },
 };
@@ -49,14 +49,17 @@ async fn handle_open_bid<B: BlindedBlockProvider>(
     State(builder): State<B>,
     Json(block): Json<serde_json::Value>,
 ) -> Result<Json<VersionedValue<ExecutionPayload>>, Error> {
-    let maybe_capella_block = capella::SignedBlindedBeaconBlock::deserialize(&block);
-    let mut block = match maybe_capella_block {
-        Ok(block) => SignedBlindedBeaconBlock::Capella(block),
-        Err(err) => match bellatrix::SignedBlindedBeaconBlock::deserialize(block) {
-            Ok(block) => SignedBlindedBeaconBlock::Bellatrix(block),
-            Err(_) => return Err(ApiClientError::from(err).into()),
-        },
-    };
+    let mut block = deneb::SignedBlindedBlockAndBlobSidecars::deserialize(&block)
+        .map(SignedBlindedBeaconBlock::Deneb)
+        .or_else(|_| {
+            capella::SignedBlindedBeaconBlock::deserialize(&block)
+                .map(SignedBlindedBeaconBlock::Capella)
+        })
+        .or_else(|_| {
+            bellatrix::SignedBlindedBeaconBlock::deserialize(&block)
+                .map(SignedBlindedBeaconBlock::Bellatrix)
+        })
+        .map_err(ApiClientError::from)?;
 
     let payload = builder.open_bid(&mut block).await?;
     let block_hash = payload.block_hash();
diff --git a/mev-rs/src/types/deneb.rs b/mev-rs/src/types/deneb.rs
index aae0505d..67e135ac 100644
--- a/mev-rs/src/types/deneb.rs
+++ b/mev-rs/src/types/deneb.rs
@@ -1,6 +1,6 @@
 pub use ethereum_consensus::{builder::SignedValidatorRegistration, deneb::mainnet as spec};
 use ethereum_consensus::{
-    deneb::mainnet::MAX_BLOBS_PER_BLOCK,
+    deneb::mainnet::{MAX_BLOBS_PER_BLOCK, MAX_BLOB_COMMITMENTS_PER_BLOCK},
     kzg::{KzgCommitment, KzgProof},
     primitives::{BlsPublicKey, BlsSignature, Root, U256},
 };
@@ -26,9 +26,9 @@ pub struct BuilderBid {
 #[derive(Debug, Default, Clone, SimpleSerialize)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct BlindedBlobsBundle {
-    pub commitments: List<KzgCommitment, MAX_BLOBS_PER_BLOCK>,
-    pub proofs: List<KzgProof, MAX_BLOBS_PER_BLOCK>,
-    pub blob_roots: List<Root, MAX_BLOBS_PER_BLOCK>,
+    pub commitments: List<KzgCommitment, MAX_BLOB_COMMITMENTS_PER_BLOCK>,
+    pub proofs: List<KzgProof, MAX_BLOB_COMMITMENTS_PER_BLOCK>,
+    pub blob_roots: List<Root, MAX_BLOB_COMMITMENTS_PER_BLOCK>,
 }
 
 #[derive(Debug, Default, Clone, SimpleSerialize)]
@@ -48,9 +48,9 @@ pub struct SignedBlindedBlockAndBlobSidecars {
 #[derive(Debug, Default, Clone, SimpleSerialize)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct BlobsBundle {
-    pub commitments: List<KzgCommitment, MAX_BLOBS_PER_BLOCK>,
-    pub proofs: List<KzgProof, MAX_BLOBS_PER_BLOCK>,
-    pub blobs: List<Blob, MAX_BLOBS_PER_BLOCK>,
+    pub commitments: List<KzgCommitment, MAX_BLOB_COMMITMENTS_PER_BLOCK>,
+    pub proofs: List<KzgProof, MAX_BLOB_COMMITMENTS_PER_BLOCK>,
+    pub blobs: List<Blob, MAX_BLOB_COMMITMENTS_PER_BLOCK>,
 }
 
 #[derive(Debug, Default, Clone, SimpleSerialize)]