Use Local Payload if More Profitable than Builder (#3934)

* Use Local Payload if More Profitable than Builder

* Rename clone -> clone_from_ref

* Minimize Clones of GetPayloadResponse

* Cleanup & Fix Tests

* Added Tests for Payload Choice by Profit

* Fix Outdated Comments

beacon_node/beacon_chain/src/test_utils.rs

@@ -426,6 +426,7 @@ where
             DEFAULT_TERMINAL_BLOCK,
             shanghai_time,
             eip4844_time,
+            None,
             Some(JwtKey::from_slice(&DEFAULT_JWT_SECRET).unwrap()),
             spec,
             None,
@@ -435,7 +436,11 @@ where
         self
     }
 
-    pub fn mock_execution_layer_with_builder(mut self, beacon_url: SensitiveUrl) -> Self {
+    pub fn mock_execution_layer_with_builder(
+        mut self,
+        beacon_url: SensitiveUrl,
+        builder_threshold: Option<u128>,
+    ) -> Self {
         // Get a random unused port
         let port = unused_port::unused_tcp_port().unwrap();
         let builder_url = SensitiveUrl::parse(format!("http://127.0.0.1:{port}").as_str()).unwrap();
@@ -452,6 +457,7 @@ where
             DEFAULT_TERMINAL_BLOCK,
             shanghai_time,
             eip4844_time,
+            builder_threshold,
             Some(JwtKey::from_slice(&DEFAULT_JWT_SECRET).unwrap()),
             spec.clone(),
             Some(builder_url.clone()),

beacon_node/execution_layer/src/engine_api.rs

@@ -14,8 +14,8 @@ use std::convert::TryFrom;
 use strum::IntoStaticStr;
 use superstruct::superstruct;
 pub use types::{
-    Address, EthSpec, ExecutionBlockHash, ExecutionPayload, ExecutionPayloadHeader, FixedVector,
+    Address, EthSpec, ExecutionBlockHash, ExecutionPayload, ExecutionPayloadHeader,
-    ForkName, Hash256, Uint256, VariableList, Withdrawal,
+    ExecutionPayloadRef, FixedVector, ForkName, Hash256, Uint256, VariableList, Withdrawal,
 };
 use types::{ExecutionPayloadCapella, ExecutionPayloadEip4844, ExecutionPayloadMerge};
 
@@ -322,6 +322,8 @@ pub struct ProposeBlindedBlockResponse {
 #[superstruct(
     variants(Merge, Capella, Eip4844),
     variant_attributes(derive(Clone, Debug, PartialEq),),
+    map_into(ExecutionPayload),
+    map_ref_into(ExecutionPayloadRef),
     cast_error(ty = "Error", expr = "Error::IncorrectStateVariant"),
     partial_getter_error(ty = "Error", expr = "Error::IncorrectStateVariant")
 )]
@@ -336,19 +338,44 @@ pub struct GetPayloadResponse<T: EthSpec> {
     pub block_value: Uint256,
 }
 
+impl<'a, T: EthSpec> From<GetPayloadResponseRef<'a, T>> for ExecutionPayloadRef<'a, T> {
+    fn from(response: GetPayloadResponseRef<'a, T>) -> Self {
+        map_get_payload_response_ref_into_execution_payload_ref!(&'a _, response, |inner, cons| {
+            cons(&inner.execution_payload)
+        })
+    }
+}
+
+impl<T: EthSpec> From<GetPayloadResponse<T>> for ExecutionPayload<T> {
+    fn from(response: GetPayloadResponse<T>) -> Self {
+        map_get_payload_response_into_execution_payload!(response, |inner, cons| {
+            cons(inner.execution_payload)
+        })
+    }
+}
+
+impl<T: EthSpec> From<GetPayloadResponse<T>> for (ExecutionPayload<T>, Uint256) {
+    fn from(response: GetPayloadResponse<T>) -> Self {
+        match response {
+            GetPayloadResponse::Merge(inner) => (
+                ExecutionPayload::Merge(inner.execution_payload),
+                inner.block_value,
+            ),
+            GetPayloadResponse::Capella(inner) => (
+                ExecutionPayload::Capella(inner.execution_payload),
+                inner.block_value,
+            ),
+            GetPayloadResponse::Eip4844(inner) => (
+                ExecutionPayload::Eip4844(inner.execution_payload),
+                inner.block_value,
+            ),
+        }
+    }
+}
+
 impl<T: EthSpec> GetPayloadResponse<T> {
-    pub fn execution_payload(self) -> ExecutionPayload<T> {
+    pub fn execution_payload_ref(&self) -> ExecutionPayloadRef<T> {
-        match self {
+        self.to_ref().into()
-            GetPayloadResponse::Merge(response) => {
-                ExecutionPayload::Merge(response.execution_payload)
-            }
-            GetPayloadResponse::Capella(response) => {
-                ExecutionPayload::Capella(response.execution_payload)
-            }
-            GetPayloadResponse::Eip4844(response) => {
-                ExecutionPayload::Eip4844(response.execution_payload)
-            }
-        }
     }
 }
 

beacon_node/execution_layer/src/engine_api/http.rs

@@ -804,7 +804,7 @@ impl HttpJsonRpc {
     pub async fn get_payload_v1<T: EthSpec>(
         &self,
         payload_id: PayloadId,
-    ) -> Result<ExecutionPayload<T>, Error> {
+    ) -> Result<GetPayloadResponse<T>, Error> {
         let params = json!([JsonPayloadIdRequest::from(payload_id)]);
 
         let payload_v1: JsonExecutionPayloadV1<T> = self
@@ -815,7 +815,11 @@ impl HttpJsonRpc {
             )
             .await?;
 
-        Ok(JsonExecutionPayload::V1(payload_v1).into())
+        Ok(GetPayloadResponse::Merge(GetPayloadResponseMerge {
+            execution_payload: payload_v1.into(),
+            // Have to guess zero here as we don't know the value
+            block_value: Uint256::zero(),
+        }))
     }
 
     pub async fn get_payload_v2<T: EthSpec>(
@@ -1015,16 +1019,10 @@ impl HttpJsonRpc {
         &self,
         fork_name: ForkName,
         payload_id: PayloadId,
-    ) -> Result<ExecutionPayload<T>, Error> {
+    ) -> Result<GetPayloadResponse<T>, Error> {
         let engine_capabilities = self.get_engine_capabilities(None).await?;
         if engine_capabilities.get_payload_v2 {
-            // TODO: modify this method to return GetPayloadResponse instead
+            self.get_payload_v2(fork_name, payload_id).await
-            //       of throwing away the `block_value` and returning only the
-            //       ExecutionPayload
-            Ok(self
-                .get_payload_v2(fork_name, payload_id)
-                .await?
-                .execution_payload())
         } else if engine_capabilities.new_payload_v1 {
             self.get_payload_v1(payload_id).await
         } else {
@@ -1675,10 +1673,11 @@ mod test {
                     }
                 })],
                 |client| async move {
-                    let payload = client
+                    let payload: ExecutionPayload<_> = client
                         .get_payload_v1::<MainnetEthSpec>(str_to_payload_id("0xa247243752eb10b4"))
                         .await
-                        .unwrap();
+                        .unwrap()
+                        .into();
 
                     let expected = ExecutionPayload::Merge(ExecutionPayloadMerge {
                             parent_hash: ExecutionBlockHash::from_str("0x3b8fb240d288781d4aac94d3fd16809ee413bc99294a085798a589dae51ddd4a").unwrap(),

beacon_node/execution_layer/src/lib.rs

@@ -119,9 +119,13 @@ impl From<ApiError> for Error {
 }
 
 pub enum BlockProposalContents<T: EthSpec, Payload: AbstractExecPayload<T>> {
-    Payload(Payload),
+    Payload {
+        payload: Payload,
+        block_value: Uint256,
+    },
     PayloadAndBlobs {
         payload: Payload,
+        block_value: Uint256,
         kzg_commitments: Vec<KzgCommitment>,
         blobs: Vec<Blob<T>>,
     },
@@ -130,9 +134,13 @@ pub enum BlockProposalContents<T: EthSpec, Payload: AbstractExecPayload<T>> {
 impl<T: EthSpec, Payload: AbstractExecPayload<T>> BlockProposalContents<T, Payload> {
     pub fn payload(&self) -> &Payload {
         match self {
-            Self::Payload(payload) => payload,
+            Self::Payload {
+                payload,
+                block_value: _,
+            } => payload,
             Self::PayloadAndBlobs {
                 payload,
+                block_value: _,
                 kzg_commitments: _,
                 blobs: _,
             } => payload,
@@ -140,9 +148,13 @@ impl<T: EthSpec, Payload: AbstractExecPayload<T>> BlockProposalContents<T, Paylo
     }
     pub fn to_payload(self) -> Payload {
         match self {
-            Self::Payload(payload) => payload,
+            Self::Payload {
+                payload,
+                block_value: _,
+            } => payload,
             Self::PayloadAndBlobs {
                 payload,
+                block_value: _,
                 kzg_commitments: _,
                 blobs: _,
             } => payload,
@@ -150,9 +162,13 @@ impl<T: EthSpec, Payload: AbstractExecPayload<T>> BlockProposalContents<T, Paylo
     }
     pub fn kzg_commitments(&self) -> Option<&[KzgCommitment]> {
         match self {
-            Self::Payload(_) => None,
+            Self::Payload {
+                payload: _,
+                block_value: _,
+            } => None,
             Self::PayloadAndBlobs {
                 payload: _,
+                block_value: _,
                 kzg_commitments,
                 blobs: _,
             } => Some(kzg_commitments),
@@ -160,21 +176,43 @@ impl<T: EthSpec, Payload: AbstractExecPayload<T>> BlockProposalContents<T, Paylo
     }
     pub fn blobs(&self) -> Option<&[Blob<T>]> {
         match self {
-            Self::Payload(_) => None,
+            Self::Payload {
+                payload: _,
+                block_value: _,
+            } => None,
             Self::PayloadAndBlobs {
                 payload: _,
+                block_value: _,
                 kzg_commitments: _,
                 blobs,
             } => Some(blobs),
         }
     }
+    pub fn block_value(&self) -> &Uint256 {
+        match self {
+            Self::Payload {
+                payload: _,
+                block_value,
+            } => block_value,
+            Self::PayloadAndBlobs {
+                payload: _,
+                block_value,
+                kzg_commitments: _,
+                blobs: _,
+            } => block_value,
+        }
+    }
     pub fn default_at_fork(fork_name: ForkName) -> Result<Self, BeaconStateError> {
         Ok(match fork_name {
             ForkName::Base | ForkName::Altair | ForkName::Merge | ForkName::Capella => {
-                BlockProposalContents::Payload(Payload::default_at_fork(fork_name)?)
+                BlockProposalContents::Payload {
+                    payload: Payload::default_at_fork(fork_name)?,
+                    block_value: Uint256::zero(),
+                }
             }
             ForkName::Eip4844 => BlockProposalContents::PayloadAndBlobs {
                 payload: Payload::default_at_fork(fork_name)?,
+                block_value: Uint256::zero(),
                 blobs: vec![],
                 kzg_commitments: vec![],
             },
@@ -366,12 +404,12 @@ impl<T: EthSpec> ExecutionLayer<T> {
         &self.inner.builder
     }
 
-    /// Cache a full payload, keyed on the `tree_hash_root` of its `transactions` field.
+    /// Cache a full payload, keyed on the `tree_hash_root` of the payload
-    fn cache_payload(&self, payload: &ExecutionPayload<T>) -> Option<ExecutionPayload<T>> {
+    fn cache_payload(&self, payload: ExecutionPayloadRef<T>) -> Option<ExecutionPayload<T>> {
-        self.inner.payload_cache.put(payload.clone())
+        self.inner.payload_cache.put(payload.clone_from_ref())
     }
 
-    /// Attempt to retrieve a full payload from the payload cache by the `transactions_root`.
+    /// Attempt to retrieve a full payload from the payload cache by the payload root
     pub fn get_payload_by_root(&self, root: &Hash256) -> Option<ExecutionPayload<T>> {
         self.inner.payload_cache.pop(root)
     }
@@ -808,6 +846,18 @@ impl<T: EthSpec> ExecutionLayer<T> {
                                 "parent_hash" => ?parent_hash,
                             );
 
+                            let relay_value = relay.data.message.value;
+                            let local_value = *local.block_value();
+                            if local_value >= relay_value {
+                                info!(
+                                    self.log(),
+                                    "Local block is more profitable than relay block";
+                                    "local_block_value" => %local_value,
+                                    "relay_value" => %relay_value
+                                );
+                                return Ok(ProvenancedPayload::Local(local));
+                            }
+
                             match verify_builder_bid(
                                 &relay,
                                 parent_hash,
@@ -818,7 +868,10 @@ impl<T: EthSpec> ExecutionLayer<T> {
                                 spec,
                             ) {
                                 Ok(()) => Ok(ProvenancedPayload::Builder(
-                                    BlockProposalContents::Payload(relay.data.message.header),
+                                    BlockProposalContents::Payload {
+                                        payload: relay.data.message.header,
+                                        block_value: relay.data.message.value,
+                                    },
                                 )),
                                 Err(reason) if !reason.payload_invalid() => {
                                     info!(
@@ -869,12 +922,18 @@ impl<T: EthSpec> ExecutionLayer<T> {
                                 spec,
                             ) {
                                 Ok(()) => Ok(ProvenancedPayload::Builder(
-                                    BlockProposalContents::Payload(relay.data.message.header),
+                                    BlockProposalContents::Payload {
+                                        payload: relay.data.message.header,
+                                        block_value: relay.data.message.value,
+                                    },
                                 )),
                                 // If the payload is valid then use it. The local EE failed
                                 // to produce a payload so we have no alternative.
                                 Err(e) if !e.payload_invalid() => Ok(ProvenancedPayload::Builder(
-                                    BlockProposalContents::Payload(relay.data.message.header),
+                                    BlockProposalContents::Payload {
+                                        payload: relay.data.message.header,
+                                        block_value: relay.data.message.value,
+                                    },
                                 )),
                                 Err(reason) => {
                                     metrics::inc_counter_vec(
@@ -988,7 +1047,7 @@ impl<T: EthSpec> ExecutionLayer<T> {
         payload_attributes: &PayloadAttributes,
         forkchoice_update_params: ForkchoiceUpdateParameters,
         current_fork: ForkName,
-        f: fn(&ExecutionLayer<T>, &ExecutionPayload<T>) -> Option<ExecutionPayload<T>>,
+        f: fn(&ExecutionLayer<T>, ExecutionPayloadRef<T>) -> Option<ExecutionPayload<T>>,
     ) -> Result<BlockProposalContents<T, Payload>, Error> {
         self.engine()
             .request(move |engine| async move {
@@ -1071,9 +1130,9 @@ impl<T: EthSpec> ExecutionLayer<T> {
                     );
                     engine.api.get_payload::<T>(current_fork, payload_id).await
                 };
-                let (blob, payload) = tokio::join!(blob_fut, payload_fut);
+                let (blob, payload_response) = tokio::join!(blob_fut, payload_fut);
-                let payload = payload.map(|full_payload| {
+                let (execution_payload, block_value) = payload_response.map(|payload_response| {
-                    if full_payload.fee_recipient() != payload_attributes.suggested_fee_recipient() {
+                    if payload_response.execution_payload_ref().fee_recipient() != payload_attributes.suggested_fee_recipient() {
                         error!(
                             self.log(),
                             "Inconsistent fee recipient";
@@ -1082,28 +1141,32 @@ impl<T: EthSpec> ExecutionLayer<T> {
                             indicate that fees are being diverted to another address. Please \
                             ensure that the value of suggested_fee_recipient is set correctly and \
                             that the Execution Engine is trusted.",
-                            "fee_recipient" => ?full_payload.fee_recipient(),
+                            "fee_recipient" => ?payload_response.execution_payload_ref().fee_recipient(),
                             "suggested_fee_recipient" => ?payload_attributes.suggested_fee_recipient(),
                         );
                     }
-                    if f(self, &full_payload).is_some() {
+                    if f(self, payload_response.execution_payload_ref()).is_some() {
                         warn!(
                             self.log(),
                             "Duplicate payload cached, this might indicate redundant proposal \
                                  attempts."
                         );
                     }
-                    full_payload.into()
+                    payload_response.into()
                 })?;
                 if let Some(blob) = blob.transpose()? {
                     // FIXME(sean) cache blobs
                     Ok(BlockProposalContents::PayloadAndBlobs {
-                        payload,
+                        payload: execution_payload.into(),
+                        block_value,
                         blobs: blob.blobs,
                         kzg_commitments: blob.kzgs,
                     })
                 } else {
-                    Ok(BlockProposalContents::Payload(payload))
+                    Ok(BlockProposalContents::Payload {
+                        payload: execution_payload.into(),
+                        block_value,
+                    })
                 }
             })
             .await
@@ -2089,7 +2152,10 @@ mod test {
     }
 }
 
-fn noop<T: EthSpec>(_: &ExecutionLayer<T>, _: &ExecutionPayload<T>) -> Option<ExecutionPayload<T>> {
+fn noop<T: EthSpec>(
+    _: &ExecutionLayer<T>,
+    _: ExecutionPayloadRef<T>,
+) -> Option<ExecutionPayload<T>> {
     None
 }
 

beacon_node/execution_layer/src/test_utils/handle_rpc.rs

@@ -1,6 +1,7 @@
 use super::Context;
 use crate::engine_api::{http::*, *};
 use crate::json_structures::*;
+use crate::test_utils::DEFAULT_MOCK_EL_PAYLOAD_VALUE_WEI;
 use serde::de::DeserializeOwned;
 use serde_json::Value as JsonValue;
 use std::sync::Arc;
@@ -211,14 +212,14 @@ pub async fn handle_rpc<T: EthSpec>(
                     JsonExecutionPayload::V1(execution_payload) => {
                         serde_json::to_value(JsonGetPayloadResponseV1 {
                             execution_payload,
-                            block_value: 0.into(),
+                            block_value: DEFAULT_MOCK_EL_PAYLOAD_VALUE_WEI.into(),
                         })
                         .unwrap()
                     }
                     JsonExecutionPayload::V2(execution_payload) => {
                         serde_json::to_value(JsonGetPayloadResponseV2 {
                             execution_payload,
-                            block_value: 0.into(),
+                            block_value: DEFAULT_MOCK_EL_PAYLOAD_VALUE_WEI.into(),
                         })
                         .unwrap()
                     }

beacon_node/execution_layer/src/test_utils/mock_builder.rs

@@ -1,4 +1,4 @@
-use crate::test_utils::DEFAULT_JWT_SECRET;
+use crate::test_utils::{DEFAULT_BUILDER_PAYLOAD_VALUE_WEI, DEFAULT_JWT_SECRET};
 use crate::{Config, ExecutionLayer, PayloadAttributes};
 use async_trait::async_trait;
 use eth2::types::{BlockId, StateId, ValidatorId};
@@ -328,7 +328,7 @@ impl<E: EthSpec> mev_build_rs::BlindedBlockProvider for MockBuilder<E> {
 
         let mut message = BuilderBid {
             header,
-            value: ssz_rs::U256::default(),
+            value: to_ssz_rs(&Uint256::from(DEFAULT_BUILDER_PAYLOAD_VALUE_WEI))?,
             public_key: self.builder_sk.public_key(),
         };
 

beacon_node/execution_layer/src/test_utils/mock_execution_layer.rs

@@ -29,6 +29,7 @@ impl<T: EthSpec> MockExecutionLayer<T> {
             DEFAULT_TERMINAL_BLOCK,
             None,
             None,
+            None,
             Some(JwtKey::from_slice(&DEFAULT_JWT_SECRET).unwrap()),
             spec,
             None,
@@ -41,6 +42,7 @@ impl<T: EthSpec> MockExecutionLayer<T> {
         terminal_block: u64,
         shanghai_time: Option<u64>,
         eip4844_time: Option<u64>,
+        builder_threshold: Option<u128>,
         jwt_key: Option<JwtKey>,
         spec: ChainSpec,
         builder_url: Option<SensitiveUrl>,
@@ -69,7 +71,7 @@ impl<T: EthSpec> MockExecutionLayer<T> {
             builder_url,
             secret_files: vec![path],
             suggested_fee_recipient: Some(Address::repeat_byte(42)),
-            builder_profit_threshold: DEFAULT_BUILDER_THRESHOLD_WEI,
+            builder_profit_threshold: builder_threshold.unwrap_or(DEFAULT_BUILDER_THRESHOLD_WEI),
             ..Default::default()
         };
         let el =

beacon_node/execution_layer/src/test_utils/mod.rs

@@ -32,6 +32,8 @@ pub const DEFAULT_TERMINAL_DIFFICULTY: u64 = 6400;
 pub const DEFAULT_TERMINAL_BLOCK: u64 = 64;
 pub const DEFAULT_JWT_SECRET: [u8; 32] = [42; 32];
 pub const DEFAULT_BUILDER_THRESHOLD_WEI: u128 = 1_000_000_000_000_000_000;
+pub const DEFAULT_MOCK_EL_PAYLOAD_VALUE_WEI: u128 = 10_000_000_000_000_000;
+pub const DEFAULT_BUILDER_PAYLOAD_VALUE_WEI: u128 = 20_000_000_000_000_000;
 pub const DEFAULT_ENGINE_CAPABILITIES: EngineCapabilities = EngineCapabilities {
     new_payload_v1: true,
     new_payload_v2: true,

beacon_node/http_api/tests/tests.rs

@@ -11,9 +11,11 @@ use eth2::{
     types::{BlockId as CoreBlockId, StateId as CoreStateId, *},
     BeaconNodeHttpClient, Error, StatusCode, Timeouts,
 };
-use execution_layer::test_utils::Operation;
 use execution_layer::test_utils::TestingBuilder;
 use execution_layer::test_utils::DEFAULT_BUILDER_THRESHOLD_WEI;
+use execution_layer::test_utils::{
+    Operation, DEFAULT_BUILDER_PAYLOAD_VALUE_WEI, DEFAULT_MOCK_EL_PAYLOAD_VALUE_WEI,
+};
 use futures::stream::{Stream, StreamExt};
 use futures::FutureExt;
 use http_api::{BlockId, StateId};
@@ -72,38 +74,53 @@ struct ApiTester {
     mock_builder: Option<Arc<TestingBuilder<E>>>,
 }
 
+struct ApiTesterConfig {
+    spec: ChainSpec,
+    builder_threshold: Option<u128>,
+}
+
+impl Default for ApiTesterConfig {
+    fn default() -> Self {
+        let mut spec = E::default_spec();
+        spec.shard_committee_period = 2;
+        Self {
+            spec,
+            builder_threshold: None,
+        }
+    }
+}
+
 impl ApiTester {
     pub async fn new() -> Self {
         // This allows for testing voluntary exits without building out a massive chain.
-        let mut spec = E::default_spec();
+        Self::new_from_config(ApiTesterConfig::default()).await
-        spec.shard_committee_period = 2;
-        Self::new_from_spec(spec).await
     }
 
     pub async fn new_with_hard_forks(altair: bool, bellatrix: bool) -> Self {
-        let mut spec = E::default_spec();
+        let mut config = ApiTesterConfig::default();
-        spec.shard_committee_period = 2;
         // Set whether the chain has undergone each hard fork.
         if altair {
-            spec.altair_fork_epoch = Some(Epoch::new(0));
+            config.spec.altair_fork_epoch = Some(Epoch::new(0));
         }
         if bellatrix {
-            spec.bellatrix_fork_epoch = Some(Epoch::new(0));
+            config.spec.bellatrix_fork_epoch = Some(Epoch::new(0));
         }
-        Self::new_from_spec(spec).await
+        Self::new_from_config(config).await
     }
 
-    pub async fn new_from_spec(spec: ChainSpec) -> Self {
+    pub async fn new_from_config(config: ApiTesterConfig) -> Self {
         // Get a random unused port
+        let spec = config.spec;
         let port = unused_port::unused_tcp_port().unwrap();
         let beacon_url = SensitiveUrl::parse(format!("http://127.0.0.1:{port}").as_str()).unwrap();
 
         let harness = Arc::new(
             BeaconChainHarness::builder(MainnetEthSpec)
                 .spec(spec.clone())
+                .logger(logging::test_logger())
                 .deterministic_keypairs(VALIDATOR_COUNT)
                 .fresh_ephemeral_store()
-                .mock_execution_layer_with_builder(beacon_url.clone())
+                .mock_execution_layer_with_builder(beacon_url.clone(), config.builder_threshold)
                 .build(),
         );
 
@@ -358,6 +375,28 @@ impl ApiTester {
         tester
     }
 
+    pub async fn new_mev_tester_no_builder_threshold() -> Self {
+        let mut config = ApiTesterConfig {
+            builder_threshold: Some(0),
+            spec: E::default_spec(),
+        };
+        config.spec.altair_fork_epoch = Some(Epoch::new(0));
+        config.spec.bellatrix_fork_epoch = Some(Epoch::new(0));
+        let tester = Self::new_from_config(config)
+            .await
+            .test_post_validator_register_validator()
+            .await;
+        tester
+            .mock_builder
+            .as_ref()
+            .unwrap()
+            .builder
+            .add_operation(Operation::Value(Uint256::from(
+                DEFAULT_BUILDER_PAYLOAD_VALUE_WEI,
+            )));
+        tester
+    }
+
     fn skip_slots(self, count: u64) -> Self {
         for _ in 0..count {
             self.chain
@@ -3278,6 +3317,117 @@ impl ApiTester {
         self
     }
 
+    pub async fn test_builder_payload_chosen_when_more_profitable(self) -> Self {
+        // Mutate value.
+        self.mock_builder
+            .as_ref()
+            .unwrap()
+            .builder
+            .add_operation(Operation::Value(Uint256::from(
+                DEFAULT_MOCK_EL_PAYLOAD_VALUE_WEI + 1,
+            )));
+
+        let slot = self.chain.slot().unwrap();
+        let epoch = self.chain.epoch().unwrap();
+
+        let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
+
+        let payload: BlindedPayload<E> = self
+            .client
+            .get_validator_blinded_blocks::<E, BlindedPayload<E>>(slot, &randao_reveal, None)
+            .await
+            .unwrap()
+            .data
+            .body()
+            .execution_payload()
+            .unwrap()
+            .into();
+
+        // The builder's payload should've been chosen, so this cache should not be populated
+        assert!(self
+            .chain
+            .execution_layer
+            .as_ref()
+            .unwrap()
+            .get_payload_by_root(&payload.tree_hash_root())
+            .is_none());
+        self
+    }
+
+    pub async fn test_local_payload_chosen_when_equally_profitable(self) -> Self {
+        // Mutate value.
+        self.mock_builder
+            .as_ref()
+            .unwrap()
+            .builder
+            .add_operation(Operation::Value(Uint256::from(
+                DEFAULT_MOCK_EL_PAYLOAD_VALUE_WEI,
+            )));
+
+        let slot = self.chain.slot().unwrap();
+        let epoch = self.chain.epoch().unwrap();
+
+        let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
+
+        let payload: BlindedPayload<E> = self
+            .client
+            .get_validator_blinded_blocks::<E, BlindedPayload<E>>(slot, &randao_reveal, None)
+            .await
+            .unwrap()
+            .data
+            .body()
+            .execution_payload()
+            .unwrap()
+            .into();
+
+        // The local payload should've been chosen, so this cache should be populated
+        assert!(self
+            .chain
+            .execution_layer
+            .as_ref()
+            .unwrap()
+            .get_payload_by_root(&payload.tree_hash_root())
+            .is_some());
+        self
+    }
+
+    pub async fn test_local_payload_chosen_when_more_profitable(self) -> Self {
+        // Mutate value.
+        self.mock_builder
+            .as_ref()
+            .unwrap()
+            .builder
+            .add_operation(Operation::Value(Uint256::from(
+                DEFAULT_MOCK_EL_PAYLOAD_VALUE_WEI - 1,
+            )));
+
+        let slot = self.chain.slot().unwrap();
+        let epoch = self.chain.epoch().unwrap();
+
+        let (_, randao_reveal) = self.get_test_randao(slot, epoch).await;
+
+        let payload: BlindedPayload<E> = self
+            .client
+            .get_validator_blinded_blocks::<E, BlindedPayload<E>>(slot, &randao_reveal, None)
+            .await
+            .unwrap()
+            .data
+            .body()
+            .execution_payload()
+            .unwrap()
+            .into();
+
+        // The local payload should've been chosen, so this cache should be populated
+        assert!(self
+            .chain
+            .execution_layer
+            .as_ref()
+            .unwrap()
+            .get_payload_by_root(&payload.tree_hash_root())
+            .is_some());
+        self
+    }
+
     #[cfg(target_os = "linux")]
     pub async fn test_get_lighthouse_health(self) -> Self {
         self.client.get_lighthouse_health().await.unwrap();
@@ -3747,9 +3897,9 @@ async fn get_events() {
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn get_events_altair() {
-    let mut spec = E::default_spec();
+    let mut config = ApiTesterConfig::default();
-    spec.altair_fork_epoch = Some(Epoch::new(0));
+    config.spec.altair_fork_epoch = Some(Epoch::new(0));
-    ApiTester::new_from_spec(spec)
+    ApiTester::new_from_config(config)
         .await
         .test_get_events_altair()
         .await;
@@ -4262,6 +4412,18 @@ async fn builder_inadequate_builder_threshold() {
         .await;
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn builder_payload_chosen_by_profit() {
+    ApiTester::new_mev_tester_no_builder_threshold()
+        .await
+        .test_builder_payload_chosen_when_more_profitable()
+        .await
+        .test_local_payload_chosen_when_equally_profitable()
+        .await
+        .test_local_payload_chosen_when_more_profitable()
+        .await;
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn lighthouse_endpoints() {
     ApiTester::new()

consensus/types/src/execution_payload.rs

@@ -87,6 +87,16 @@ pub struct ExecutionPayload<T: EthSpec> {
     pub withdrawals: Withdrawals<T>,
 }
 
+impl<'a, T: EthSpec> ExecutionPayloadRef<'a, T> {
+    // this emulates clone on a normal reference type
+    pub fn clone_from_ref(&self) -> ExecutionPayload<T> {
+        map_execution_payload_ref!(&'a _, self, move |payload, cons| {
+            cons(payload);
+            payload.clone().into()
+        })
+    }
+}
+
 impl<T: EthSpec> ExecutionPayload<T> {
     pub fn from_ssz_bytes(bytes: &[u8], fork_name: ForkName) -> Result<Self, ssz::DecodeError> {
         match fork_name {