diff --git a/beacon_node/http_api/src/lib.rs b/beacon_node/http_api/src/lib.rs
index 4f4a57be29..56ba86bb16 100644
--- a/beacon_node/http_api/src/lib.rs
+++ b/beacon_node/http_api/src/lib.rs
@@ -58,6 +58,7 @@ use std::pin::Pin;
 use std::sync::Arc;
 use sysinfo::{System, SystemExt};
 use system_health::observe_system_health_bn;
+use task_spawner::{Priority, TaskSpawner};
 use tokio::sync::mpsc::{Sender, UnboundedSender};
 use tokio_stream::{wrappers::BroadcastStream, StreamExt};
 use types::{
@@ -490,6 +491,11 @@ pub fn serve<T: BeaconChainTypes>(
     let app_start = std::time::Instant::now();
     let app_start_filter = warp::any().map(move || app_start);
 
+    // Create a `warp` filter that provides access the `TaskSpawner`.
+    let beacon_processor_send = ctx.beacon_processor_send.clone();
+    let task_spawner_filter =
+        warp::any().map(move || TaskSpawner::new(beacon_processor_send.clone()));
+
     /*
      *
      * Start of HTTP method definitions.
@@ -501,17 +507,20 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("beacon"))
         .and(warp::path("genesis"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let genesis_data = api_types::GenesisData {
-                    genesis_time: chain.genesis_time,
-                    genesis_validators_root: chain.genesis_validators_root,
-                    genesis_fork_version: chain.spec.genesis_fork_version,
-                };
-                Ok(api_types::GenericResponse::from(genesis_data))
-            })
-        });
+        .and_then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let genesis_data = api_types::GenesisData {
+                        genesis_time: chain.genesis_time,
+                        genesis_validators_root: chain.genesis_validators_root,
+                        genesis_fork_version: chain.spec.genesis_fork_version,
+                    };
+                    Ok(api_types::GenericResponse::from(genesis_data))
+                })
+            },
+        );
 
     /*
      * beacon/states/{state_id}
@@ -525,6 +534,7 @@ pub fn serve<T: BeaconChainTypes>(
                 "Invalid state ID".to_string(),
             ))
         }))
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone());
 
     // GET beacon/states/{state_id}/root
@@ -532,65 +542,77 @@ pub fn serve<T: BeaconChainTypes>(
         .clone()
         .and(warp::path("root"))
         .and(warp::path::end())
-        .and_then(|state_id: StateId, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let (root, execution_optimistic, finalized) = state_id.root(&chain)?;
-                Ok(root)
-                    .map(api_types::RootData::from)
-                    .map(api_types::GenericResponse::from)
-                    .map(|resp| {
-                        resp.add_execution_optimistic_finalized(execution_optimistic, finalized)
-                    })
-            })
-        });
+        .and_then(
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (root, execution_optimistic, finalized) = state_id.root(&chain)?;
+                    Ok(root)
+                        .map(api_types::RootData::from)
+                        .map(api_types::GenericResponse::from)
+                        .map(|resp| {
+                            resp.add_execution_optimistic_finalized(execution_optimistic, finalized)
+                        })
+                })
+            },
+        );
 
     // GET beacon/states/{state_id}/fork
     let get_beacon_state_fork = beacon_states_path
         .clone()
         .and(warp::path("fork"))
         .and(warp::path::end())
-        .and_then(|state_id: StateId, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let (fork, execution_optimistic, finalized) =
-                    state_id.fork_and_execution_optimistic_and_finalized(&chain)?;
-                Ok(api_types::ExecutionOptimisticFinalizedResponse {
-                    data: fork,
-                    execution_optimistic: Some(execution_optimistic),
-                    finalized: Some(finalized),
+        .and_then(
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (fork, execution_optimistic, finalized) =
+                        state_id.fork_and_execution_optimistic_and_finalized(&chain)?;
+                    Ok(api_types::ExecutionOptimisticFinalizedResponse {
+                        data: fork,
+                        execution_optimistic: Some(execution_optimistic),
+                        finalized: Some(finalized),
+                    })
                 })
-            })
-        });
+            },
+        );
 
     // GET beacon/states/{state_id}/finality_checkpoints
     let get_beacon_state_finality_checkpoints = beacon_states_path
         .clone()
         .and(warp::path("finality_checkpoints"))
         .and(warp::path::end())
-        .and_then(|state_id: StateId, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let (data, execution_optimistic, finalized) = state_id
-                    .map_state_and_execution_optimistic_and_finalized(
-                        &chain,
-                        |state, execution_optimistic, finalized| {
-                            Ok((
-                                api_types::FinalityCheckpointsData {
-                                    previous_justified: state.previous_justified_checkpoint(),
-                                    current_justified: state.current_justified_checkpoint(),
-                                    finalized: state.finalized_checkpoint(),
-                                },
-                                execution_optimistic,
-                                finalized,
-                            ))
-                        },
-                    )?;
+        .and_then(
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (data, execution_optimistic, finalized) = state_id
+                        .map_state_and_execution_optimistic_and_finalized(
+                            &chain,
+                            |state, execution_optimistic, finalized| {
+                                Ok((
+                                    api_types::FinalityCheckpointsData {
+                                        previous_justified: state.previous_justified_checkpoint(),
+                                        current_justified: state.current_justified_checkpoint(),
+                                        finalized: state.finalized_checkpoint(),
+                                    },
+                                    execution_optimistic,
+                                    finalized,
+                                ))
+                            },
+                        )?;
 
-                Ok(api_types::ExecutionOptimisticFinalizedResponse {
-                    data,
-                    execution_optimistic: Some(execution_optimistic),
-                    finalized: Some(finalized),
+                    Ok(api_types::ExecutionOptimisticFinalizedResponse {
+                        data,
+                        execution_optimistic: Some(execution_optimistic),
+                        finalized: Some(finalized),
+                    })
                 })
-            })
-        });
+            },
+        );
 
     // GET beacon/states/{state_id}/validator_balances?id
     let get_beacon_state_validator_balances = beacon_states_path
@@ -600,9 +622,10 @@ pub fn serve<T: BeaconChainTypes>(
         .and(multi_key_query::<api_types::ValidatorBalancesQuery>())
         .and_then(
             |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              query_res: Result<api_types::ValidatorBalancesQuery, warp::Rejection>| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let query = query_res?;
                     let (data, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
@@ -657,9 +680,10 @@ pub fn serve<T: BeaconChainTypes>(
         .and(multi_key_query::<api_types::ValidatorsQuery>())
         .and_then(
             |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              query_res: Result<api_types::ValidatorsQuery, warp::Rejection>| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let query = query_res?;
                     let (data, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
@@ -739,8 +763,11 @@ pub fn serve<T: BeaconChainTypes>(
         }))
         .and(warp::path::end())
         .and_then(
-            |state_id: StateId, chain: Arc<BeaconChain<T>>, validator_id: ValidatorId| {
-                blocking_json_task(move || {
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
+             validator_id: ValidatorId| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (data, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
                             &chain,
@@ -799,8 +826,11 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::query::<api_types::CommitteesQuery>())
         .and(warp::path::end())
         .and_then(
-            |state_id: StateId, chain: Arc<BeaconChain<T>>, query: api_types::CommitteesQuery| {
-                blocking_json_task(move || {
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
+             query: api_types::CommitteesQuery| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (data, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
                             &chain,
@@ -980,9 +1010,10 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and_then(
             |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              query: api_types::SyncCommitteesQuery| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (sync_committee, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
                             &chain,
@@ -1044,8 +1075,11 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::query::<api_types::RandaoQuery>())
         .and(warp::path::end())
         .and_then(
-            |state_id: StateId, chain: Arc<BeaconChain<T>>, query: api_types::RandaoQuery| {
-                blocking_json_task(move || {
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
+             query: api_types::RandaoQuery| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (randao, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
                             &chain,
@@ -1080,10 +1114,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("headers"))
         .and(warp::query::<api_types::HeadersQuery>())
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and_then(
-            |query: api_types::HeadersQuery, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+            |query: api_types::HeadersQuery,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (root, block, execution_optimistic, finalized) =
                         match (query.slot, query.parent_root) {
                             // No query parameters, return the canonical head block.
@@ -1177,36 +1214,41 @@ pub fn serve<T: BeaconChainTypes>(
             ))
         }))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|block_id: BlockId, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let (root, execution_optimistic, finalized) = block_id.root(&chain)?;
-                // Ignore the second `execution_optimistic` since the first one has more
-                // information about the original request.
-                let (block, _execution_optimistic, _finalized) =
-                    BlockId::from_root(root).blinded_block(&chain)?;
+        .and_then(
+            |block_id: BlockId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (root, execution_optimistic, finalized) = block_id.root(&chain)?;
+                    // Ignore the second `execution_optimistic` since the first one has more
+                    // information about the original request.
+                    let (block, _execution_optimistic, _finalized) =
+                        BlockId::from_root(root).blinded_block(&chain)?;
 
-                let canonical = chain
-                    .block_root_at_slot(block.slot(), WhenSlotSkipped::None)
-                    .map_err(warp_utils::reject::beacon_chain_error)?
-                    .map_or(false, |canonical| root == canonical);
+                    let canonical = chain
+                        .block_root_at_slot(block.slot(), WhenSlotSkipped::None)
+                        .map_err(warp_utils::reject::beacon_chain_error)?
+                        .map_or(false, |canonical| root == canonical);
 
-                let data = api_types::BlockHeaderData {
-                    root,
-                    canonical,
-                    header: api_types::BlockHeaderAndSignature {
-                        message: block.message().block_header(),
-                        signature: block.signature().clone().into(),
-                    },
-                };
+                    let data = api_types::BlockHeaderData {
+                        root,
+                        canonical,
+                        header: api_types::BlockHeaderAndSignature {
+                            message: block.message().block_header(),
+                            signature: block.signature().clone().into(),
+                        },
+                    };
 
-                Ok(api_types::ExecutionOptimisticFinalizedResponse {
-                    execution_optimistic: Some(execution_optimistic),
-                    finalized: Some(finalized),
-                    data,
+                    Ok(api_types::ExecutionOptimisticFinalizedResponse {
+                        execution_optimistic: Some(execution_optimistic),
+                        finalized: Some(finalized),
+                        data,
+                    })
                 })
-            })
-        });
+            },
+        );
 
     /*
      * beacon/blocks
@@ -1218,24 +1260,28 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("blocks"))
         .and(warp::path::end())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(network_tx_filter.clone())
         .and(log_filter.clone())
         .and_then(
             |block: Arc<SignedBeaconBlock<T::EthSpec>>,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
-             log: Logger| async move {
-                publish_blocks::publish_block(
-                    None,
-                    ProvenancedBlock::local(block),
-                    chain,
-                    &network_tx,
-                    log,
-                    BroadcastValidation::default(),
-                )
-                .await
-                .map(|()| warp::reply().into_response())
+             log: Logger| {
+                task_spawner.async_task(Priority::P1, async move {
+                    publish_blocks::publish_block(
+                        None,
+                        ProvenancedBlock::local(block),
+                        chain,
+                        &network_tx,
+                        log,
+                        BroadcastValidation::default(),
+                    )
+                    .await
+                    .map(|()| warp::reply().into_response())
+                })
             },
         );
 
diff --git a/beacon_node/http_api/src/task_spawner.rs b/beacon_node/http_api/src/task_spawner.rs
index d170d31118..0f6717f3a2 100644
--- a/beacon_node/http_api/src/task_spawner.rs
+++ b/beacon_node/http_api/src/task_spawner.rs
@@ -8,6 +8,20 @@ use warp::reply::{Reply, Response};
 #[derive(Clone, Copy)]
 pub enum Priority {
     P0,
+    P1,
+}
+
+impl Priority {
+    fn work_event<E: EthSpec>(&self, process_fn: BlockingOrAsync) -> WorkEvent<E> {
+        let work = match self {
+            Priority::P0 => Work::ApiRequestP0(process_fn),
+            Priority::P1 => unimplemented!("P1"),
+        };
+        WorkEvent {
+            drop_during_sync: false,
+            work,
+        }
+    }
 }
 
 pub struct TaskSpawner<E: EthSpec> {
@@ -22,7 +36,7 @@ impl<E: EthSpec> TaskSpawner<E> {
     }
 
     pub async fn blocking_json_task<F, T>(
-        &self,
+        self,
         priority: Priority,
         func: F,
     ) -> Result<Response, warp::Rejection>
@@ -112,15 +126,7 @@ async fn send_to_beacon_processor<E: EthSpec, T>(
 where
     T: Serialize + Send + 'static,
 {
-    let work = match priority {
-        Priority::P0 => Work::ApiRequestP0(process_fn),
-    };
-    let work_event = WorkEvent {
-        drop_during_sync: false,
-        work,
-    };
-
-    let error_message = match beacon_processor_send.try_send(work_event) {
+    let error_message = match beacon_processor_send.try_send(priority.work_event(process_fn)) {
         Ok(()) => {
             match rx.await {
                 // The beacon processor executed the task and sent a result.