diff --git a/beacon_chain/gossip_processing/gossip_validation.nim b/beacon_chain/gossip_processing/gossip_validation.nim
index 25a0f08e81..37b42fbc04 100644
--- a/beacon_chain/gossip_processing/gossip_validation.nim
+++ b/beacon_chain/gossip_processing/gossip_validation.nim
@@ -18,7 +18,7 @@ import
     helpers, network, signatures, peerdas_helpers],
   ../consensus_object_pools/[
     attestation_pool, blockchain_dag, blob_quarantine, block_quarantine,
-    spec_cache, light_client_pool, sync_committee_msg_pool,
+    light_client_pool, spec_cache, sync_committee_msg_pool,
     validator_change_pool],
   ".."/[beacon_clock],
   ./batch_validation
@@ -973,6 +973,78 @@ proc validateBeaconBlock*(
 
   ok()
 
+# https://github.com/ethereum/consensus-specs/blob/v1.6.0-beta.0/specs/gloas/p2p-interface.md#execution_payload
+proc validateExecutionPayload*(
+    dag: ChainDAGRef, quarantine: ref Quarantine,
+    signed_execution_payload_envelope: SignedExecutionPayloadEnvelope):
+    Result[void, ValidationError] =
+  template envelope: untyped = signed_execution_payload_envelope.message
+
+  # [IGNORE] The envelope's block root envelope.block_root has been seen (via
+  # gossip or non-gossip sources) (a client MAY queue payload for processing
+  # once the block is retrieved).
+  let blockSeen =
+    block:
+      var seen =
+        envelope.beacon_block_root in quarantine.unviable or
+        envelope.beacon_block_root in quarantine.missing or
+        dag.getBlockRef(envelope.beacon_block_root).isSome()
+      if not seen:
+        for k, _ in quarantine.orphans:
+          if k[0] == envelope.beacon_block_root:
+            seen = true
+            break
+      seen
+  if not blockSeen:
+    return errIgnore("ExecutionPayload: block not found")
+
+  # [IGNORE] The node has not seen another valid SignedExecutionPayloadEnvelope
+  # for this block root from this builder.
+  debugGloasComment("")
+
+  # [REJECT] block passes validation.
+  let blck =
+    block:
+      let forkedBlock = dag.getForkedBlock(signed_execution_payload_envelope.toBlockId()).valueOr:
+        return errReject("ExecutionPayload: invalid block")
+      withBlck(forkedBlock):
+        when consensusFork >= ConsensusFork.Gloas:
+          forkyBlck.asSigned().message
+        else:
+          return errReject("ExecutionPayload: invalid fork")
+
+  # [REJECT] block.slot equals envelope.slot.
+  if blck.slot != envelope.slot:
+    return errReject("ExecutionPayload: slot mismatch")
+
+  # TODO: check if it needs fallback to `state.latest_execution_payload_bid`
+  template bid: untyped = blck.body.signed_execution_payload_bid.message
+  debug "Validating execution payload", bid = shortLog(bid)
+
+  # [REJECT] envelope.builder_index == bid.builder_index
+  if envelope.builder_index != bid.builder_index:
+    return errReject("ExecutionPayload: builder index mismatch")
+
+  # [REJECT] payload.block_hash == bid.block_hash
+  if envelope.payload.block_hash != bid.block_hash:
+    return errReject("ExecutionPayload: block hash mismatch")
+
+  # [REJECT] signed_execution_payload_envelope.signature is valid with respect
+  # to the builder's public key.
+  withState(dag.headState):
+    when consensusFork >= ConsensusFork.Gloas:
+      if not verify_execution_payload_envelope_signature(
+          dag.forkAtEpoch(envelope.slot.epoch),
+          getStateField(dag.headState, genesis_validators_root),
+          signed_execution_payload_envelope, forkyState.data,
+          dag.validatorKey(envelope.builder_index).get(),
+          signed_execution_payload_envelope.signature):
+        return dag.checkedReject("ExecutionPayload: invalid builder signature")
+    else:
+      return dag.checkedReject("ExecutionPayload: invalid fork")
+
+  ok()
+
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
 # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
 proc validateAttestation*(
diff --git a/beacon_chain/spec/datatypes/gloas.nim b/beacon_chain/spec/datatypes/gloas.nim
index c6fd70a3f9..2d93504197 100644
--- a/beacon_chain/spec/datatypes/gloas.nim
+++ b/beacon_chain/spec/datatypes/gloas.nim
@@ -22,7 +22,7 @@ import
   json_serialization,
   ssz_serialization/[merkleization, proofs],
   ssz_serialization/types as sszTypes,
-  ../digest,
+  ../[block_id, digest],
   kzg4844/[kzg, kzg_abi]
 
 from ./altair import
@@ -115,7 +115,7 @@ type
 
   # https://github.com/ethereum/consensus-specs/blob/v1.6.0-alpha.6/specs/gloas/beacon-chain.md#payloadattestationmessage
   PayloadAttestationMessage* = object
-    validatorIndex*: uint64
+    validator_index*: uint64
     data*: PayloadAttestationData
     signature*: ValidatorSig
 
@@ -626,3 +626,6 @@ template asTrusted*(
     x: SignedBeaconBlock |
        SigVerifiedSignedBeaconBlock): TrustedSignedBeaconBlock =
   isomorphicCast[TrustedSignedBeaconBlock](x)
+
+func toBlockId*(v: SignedExecutionPayloadEnvelope): BlockId =
+  BlockId(root: v.message.beacon_block_root, slot: v.message.slot)