diff --git a/beacon_node/http_api/tests/tests.rs b/beacon_node/http_api/tests/tests.rs
index a7ba2c1ab..098f9f105 100644
--- a/beacon_node/http_api/tests/tests.rs
+++ b/beacon_node/http_api/tests/tests.rs
@@ -2721,6 +2721,31 @@ impl ApiTester {
         self
     }
 
+    /// Check that the metadata from the headers & JSON response body are consistent, and that the
+    /// consensus block value is non-zero.
+    fn check_block_v3_metadata(
+        metadata: &ProduceBlockV3Metadata,
+        response: &JsonProduceBlockV3Response<E>,
+    ) {
+        // Compare fork name to ForkVersionedResponse rather than metadata consensus_version, which
+        // is deserialized to a dummy value.
+        assert_eq!(Some(metadata.consensus_version), response.version);
+        assert_eq!(ForkName::Base, response.metadata.consensus_version);
+        assert_eq!(
+            metadata.execution_payload_blinded,
+            response.metadata.execution_payload_blinded
+        );
+        assert_eq!(
+            metadata.execution_payload_value,
+            response.metadata.execution_payload_value
+        );
+        assert_eq!(
+            metadata.consensus_block_value,
+            response.metadata.consensus_block_value
+        );
+        assert!(!metadata.consensus_block_value.is_zero());
+    }
+
     pub async fn test_block_production_v3_ssz(self) -> Self {
         let fork = self.chain.canonical_head.cached_head().head_fork();
         let genesis_validators_root = self.chain.genesis_validators_root;
@@ -3582,11 +3607,12 @@ impl ApiTester {
 
         let (proposer_index, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let payload: BlindedPayload<E> = match payload_type.data {
             ProduceBlockV3Response::Blinded(payload) => {
@@ -3608,11 +3634,12 @@ impl ApiTester {
 
         let (proposer_index, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, Some(0))
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let payload: FullPayload<E> = match payload_type.data {
             ProduceBlockV3Response::Full(payload) => {
@@ -3634,11 +3661,12 @@ impl ApiTester {
 
         let (proposer_index, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, Some(u64::MAX))
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let payload: BlindedPayload<E> = match payload_type.data {
             ProduceBlockV3Response::Blinded(payload) => {
@@ -3738,11 +3766,12 @@ impl ApiTester {
 
         let (proposer_index, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let payload: BlindedPayload<E> = match payload_type.data {
             ProduceBlockV3Response::Blinded(payload) => {
@@ -3814,11 +3843,12 @@ impl ApiTester {
 
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let payload: BlindedPayload<E> = match payload_type.data {
             ProduceBlockV3Response::Blinded(payload) => {
@@ -3904,11 +3934,12 @@ impl ApiTester {
 
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let payload: FullPayload<E> = match payload_type.data {
             ProduceBlockV3Response::Full(payload) => {
@@ -3990,11 +4021,12 @@ impl ApiTester {
             .unwrap();
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let payload: FullPayload<E> = match payload_type.data {
             ProduceBlockV3Response::Full(payload) => {
@@ -4076,11 +4108,12 @@ impl ApiTester {
 
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let payload: FullPayload<E> = match payload_type.data {
             ProduceBlockV3Response::Full(payload) => {
@@ -4160,11 +4193,12 @@ impl ApiTester {
 
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let payload: FullPayload<E> = match payload_type.data {
             ProduceBlockV3Response::Full(payload) => {
@@ -4216,11 +4250,12 @@ impl ApiTester {
 
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         match payload_type.data {
             ProduceBlockV3Response::Full(_) => (),
@@ -4282,11 +4317,12 @@ impl ApiTester {
 
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         match payload_type.data {
             ProduceBlockV3Response::Full(_) => (),
@@ -4390,11 +4426,12 @@ impl ApiTester {
             .get_test_randao(next_slot, next_slot.epoch(E::slots_per_epoch()))
             .await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(next_slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         match payload_type.data {
             ProduceBlockV3Response::Blinded(_) => (),
@@ -4410,11 +4447,12 @@ impl ApiTester {
             .get_test_randao(next_slot, next_slot.epoch(E::slots_per_epoch()))
             .await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(next_slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         match payload_type.data {
             ProduceBlockV3Response::Full(_) => (),
@@ -4538,11 +4576,12 @@ impl ApiTester {
             .get_test_randao(next_slot, next_slot.epoch(E::slots_per_epoch()))
             .await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(next_slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         match payload_type.data {
             ProduceBlockV3Response::Full(_) => (),
@@ -4568,11 +4607,12 @@ impl ApiTester {
             .get_test_randao(next_slot, next_slot.epoch(E::slots_per_epoch()))
             .await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(next_slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         match payload_type.data {
             ProduceBlockV3Response::Blinded(_) => (),
@@ -4648,11 +4688,12 @@ impl ApiTester {
 
         let (proposer_index, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let payload: FullPayload<E> = match payload_type.data {
             ProduceBlockV3Response::Full(payload) => {
@@ -4717,11 +4758,12 @@ impl ApiTester {
 
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         match payload_type.data {
             ProduceBlockV3Response::Blinded(_) => (),
@@ -4781,11 +4823,12 @@ impl ApiTester {
 
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         match payload_type.data {
             ProduceBlockV3Response::Full(_) => (),
@@ -4845,11 +4888,12 @@ impl ApiTester {
 
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         match payload_type.data {
             ProduceBlockV3Response::Full(_) => (),
@@ -4907,11 +4951,12 @@ impl ApiTester {
         let epoch = self.chain.epoch().unwrap();
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         let _block_contents = match payload_type.data {
             ProduceBlockV3Response::Blinded(payload) => payload,
@@ -4979,11 +5024,12 @@ impl ApiTester {
         let epoch = self.chain.epoch().unwrap();
         let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
 
-        let (payload_type, _) = self
+        let (payload_type, metadata) = self
             .client
             .get_validator_blocks_v3::<E>(slot, &randao_reveal, None, None)
             .await
             .unwrap();
+        Self::check_block_v3_metadata(&metadata, &payload_type);
 
         match payload_type.data {
             ProduceBlockV3Response::Full(_) => (),
diff --git a/common/eth2/src/types.rs b/common/eth2/src/types.rs
index a301055f3..8a1cf2ff3 100644
--- a/common/eth2/src/types.rs
+++ b/common/eth2/src/types.rs
@@ -1710,12 +1710,12 @@ impl TryFrom<&HeaderMap> for ProduceBlockV3Metadata {
             })?;
         let execution_payload_value =
             parse_required_header(headers, EXECUTION_PAYLOAD_VALUE_HEADER, |s| {
-                s.parse::<Uint256>()
+                Uint256::from_dec_str(s)
                     .map_err(|e| format!("invalid {EXECUTION_PAYLOAD_VALUE_HEADER}: {e:?}"))
             })?;
         let consensus_block_value =
             parse_required_header(headers, CONSENSUS_BLOCK_VALUE_HEADER, |s| {
-                s.parse::<Uint256>()
+                Uint256::from_dec_str(s)
                     .map_err(|e| format!("invalid {CONSENSUS_BLOCK_VALUE_HEADER}: {e:?}"))
             })?;