diff --git a/bin/node-template/node/src/service.rs b/bin/node-template/node/src/service.rs
index b9bc68ce3a8b6..e8578ab5b52de 100644
--- a/bin/node-template/node/src/service.rs
+++ b/bin/node-template/node/src/service.rs
@@ -111,7 +111,7 @@ pub fn new_full(config: Configuration) -> Result<impl AbstractService, ServiceEr
 			let provider = client as Arc<dyn StorageAndProofProvider<_, _>>;
 			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, provider)) as _)
 		})?
-		.build()?;
+		.build_full()?;
 
 	if role.is_authority() {
 		let proposer = sc_basic_authorship::ProposerFactory::new(
@@ -264,5 +264,5 @@ pub fn new_light(config: Configuration) -> Result<impl AbstractService, ServiceE
 			let provider = client as Arc<dyn StorageAndProofProvider<_, _>>;
 			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, provider)) as _)
 		})?
-		.build()
+		.build_light()
 }
diff --git a/bin/node/cli/src/service.rs b/bin/node/cli/src/service.rs
index dfeca726b8449..e087186d5485a 100644
--- a/bin/node/cli/src/service.rs
+++ b/bin/node/cli/src/service.rs
@@ -179,7 +179,7 @@ macro_rules! new_full {
 				let provider = client as Arc<dyn grandpa::StorageAndProofProvider<_, _>>;
 				Ok(Arc::new(grandpa::FinalityProofProvider::new(backend, provider)) as _)
 			})?
-			.build()?;
+			.build_full()?;
 
 		let (block_import, grandpa_link, babe_link) = import_setup.take()
 			.expect("Link Half and Block Import are present for Full Services or setup failed before. qed");
@@ -405,7 +405,7 @@ pub fn new_light(config: Configuration)
 
 			Ok(node_rpc::create_light(light_deps))
 		})?
-		.build()?;
+		.build_light()?;
 
 	Ok(service)
 }
diff --git a/client/service/src/builder.rs b/client/service/src/builder.rs
index c6cf8bf5df626..813fe50cce513 100644
--- a/client/service/src/builder.rs
+++ b/client/service/src/builder.rs
@@ -57,7 +57,7 @@ use std::{
 };
 use wasm_timer::SystemTime;
 use sc_telemetry::{telemetry, SUBSTRATE_INFO};
-use sp_transaction_pool::MaintainedTransactionPool;
+use sp_transaction_pool::{LocalTransactionPool, MaintainedTransactionPool};
 use prometheus_endpoint::Registry;
 use sc_client_db::{Backend, DatabaseSettings};
 use sp_core::traits::CodeExecutor;
@@ -959,8 +959,7 @@ ServiceBuilder<
 		Ok(self)
 	}
 
-	/// Builds the service.
-	pub fn build(self) -> Result<Service<
+	fn build_common(self) -> Result<Service<
 		TBl,
 		Client<TBackend, TExec, TBl, TRtApi>,
 		TSc,
@@ -1016,10 +1015,6 @@ ServiceBuilder<
 			"best" => ?chain_info.best_hash
 		);
 
-		// make transaction pool available for off-chain runtime calls.
-		client.execution_extensions()
-			.register_transaction_pool(Arc::downgrade(&transaction_pool) as _);
-
 		let transaction_pool_adapter = Arc::new(TransactionPoolAdapter {
 			imports_external_transactions: !matches!(config.role, Role::Light),
 			pool: transaction_pool.clone(),
@@ -1421,4 +1416,82 @@ ServiceBuilder<
 			_base_path: config.base_path.map(Arc::new),
 		})
 	}
+
+	/// Builds the light service.
+	pub fn build_light(self) -> Result<Service<
+		TBl,
+		Client<TBackend, TExec, TBl, TRtApi>,
+		TSc,
+		NetworkStatus<TBl>,
+		NetworkService<TBl, <TBl as BlockT>::Hash>,
+		TExPool,
+		sc_offchain::OffchainWorkers<
+			Client<TBackend, TExec, TBl, TRtApi>,
+			TBackend::OffchainStorage,
+			TBl
+		>,
+	>, Error>
+		where TExec: CallExecutor<TBl, Backend = TBackend>,
+	{
+		self.build_common()
+	}
+}
+
+impl<TBl, TRtApi, TBackend, TExec, TSc, TImpQu, TExPool, TRpc>
+ServiceBuilder<
+	TBl,
+	TRtApi,
+	Client<TBackend, TExec, TBl, TRtApi>,
+	Arc<OnDemand<TBl>>,
+	TSc,
+	TImpQu,
+	BoxFinalityProofRequestBuilder<TBl>,
+	Arc<dyn FinalityProofProvider<TBl>>,
+	TExPool,
+	TRpc,
+	TBackend,
+> where
+	Client<TBackend, TExec, TBl, TRtApi>: ProvideRuntimeApi<TBl>,
+	<Client<TBackend, TExec, TBl, TRtApi> as ProvideRuntimeApi<TBl>>::Api:
+		sp_api::Metadata<TBl> +
+		sc_offchain::OffchainWorkerApi<TBl> +
+		sp_transaction_pool::runtime_api::TaggedTransactionQueue<TBl> +
+		sp_session::SessionKeys<TBl> +
+		sp_api::ApiErrorExt<Error = sp_blockchain::Error> +
+		sp_api::ApiExt<TBl, StateBackend = TBackend::State>,
+	TBl: BlockT,
+	TRtApi: 'static + Send + Sync,
+	TBackend: 'static + sc_client_api::backend::Backend<TBl> + Send,
+	TExec: 'static + CallExecutor<TBl> + Send + Sync + Clone,
+	TSc: Clone,
+	TImpQu: 'static + ImportQueue<TBl>,
+	TExPool: MaintainedTransactionPool<Block = TBl, Hash = <TBl as BlockT>::Hash> +
+		LocalTransactionPool<Block = TBl, Hash = <TBl as BlockT>::Hash> +
+		MallocSizeOfWasm +
+		'static,
+	TRpc: sc_rpc::RpcExtension<sc_rpc::Metadata>,
+{
+
+	/// Builds the full service.
+	pub fn build_full(self) -> Result<Service<
+		TBl,
+		Client<TBackend, TExec, TBl, TRtApi>,
+		TSc,
+		NetworkStatus<TBl>,
+		NetworkService<TBl, <TBl as BlockT>::Hash>,
+		TExPool,
+		sc_offchain::OffchainWorkers<
+			Client<TBackend, TExec, TBl, TRtApi>,
+			TBackend::OffchainStorage,
+			TBl
+		>,
+	>, Error>
+		where TExec: CallExecutor<TBl, Backend = TBackend>,
+	{
+		// make transaction pool available for off-chain runtime calls.
+		self.client.execution_extensions()
+			.register_transaction_pool(Arc::downgrade(&self.transaction_pool) as _);
+
+		self.build_common()
+	}
 }
diff --git a/client/transaction-pool/src/api.rs b/client/transaction-pool/src/api.rs
index c7665022a5623..10ac4aa46960d 100644
--- a/client/transaction-pool/src/api.rs
+++ b/client/transaction-pool/src/api.rs
@@ -87,29 +87,15 @@ where
 		let client = self.client.clone();
 		let at = at.clone();
 
-		self.pool.spawn_ok(futures_diagnose::diagnose("validate-transaction", async move {
-			sp_tracing::enter_span!("validate_transaction");
-			let runtime_api = client.runtime_api();
-			let has_v2 = sp_tracing::tracing_span! { "check_version";
-				runtime_api
-				.has_api_with::<dyn TaggedTransactionQueue<Self::Block, Error=()>, _>(
-					&at, |v| v >= 2,
-				)
-				.unwrap_or_default()
-			};
-
-			sp_tracing::enter_span!("runtime::validate_transaction");
-			let res = if has_v2 {
-				runtime_api.validate_transaction(&at, source, uxt)
-			} else {
-				#[allow(deprecated)] // old validate_transaction
-				runtime_api.validate_transaction_before_version_2(&at, uxt)
-			};
-			let res = res.map_err(|e| Error::RuntimeApi(e.to_string()));
-			if let Err(e) = tx.send(res) {
-				log::warn!("Unable to send a validate transaction result: {:?}", e);
-			}
-		}));
+		self.pool.spawn_ok(futures_diagnose::diagnose(
+			"validate-transaction",
+			async move {
+				let res = validate_transaction_blocking(&*client, &at, source, uxt);
+				if let Err(e) = tx.send(res) {
+					log::warn!("Unable to send a validate transaction result: {:?}", e);
+				}
+			},
+		));
 
 		Box::pin(async move {
 			match rx.await {
@@ -143,6 +129,62 @@ where
 	}
 }
 
+/// Helper function to validate a transaction using a full chain API.
+/// This method will call into the runtime to perform the validation.
+fn validate_transaction_blocking<Client, Block>(
+	client: &Client,
+	at: &BlockId<Block>,
+	source: TransactionSource,
+	uxt: sc_transaction_graph::ExtrinsicFor<FullChainApi<Client, Block>>,
+) -> error::Result<TransactionValidity>
+where
+	Block: BlockT,
+	Client: ProvideRuntimeApi<Block> + BlockBackend<Block> + BlockIdTo<Block>,
+	Client: Send + Sync + 'static,
+	Client::Api: TaggedTransactionQueue<Block>,
+	sp_api::ApiErrorFor<Client, Block>: Send + std::fmt::Display,
+{
+	sp_tracing::enter_span!("validate_transaction");
+	let runtime_api = client.runtime_api();
+	let has_v2 = sp_tracing::tracing_span! { "check_version";
+		runtime_api
+			.has_api_with::<dyn TaggedTransactionQueue<Block, Error=()>, _>(&at, |v| v >= 2)
+			.unwrap_or_default()
+	};
+
+	sp_tracing::enter_span!("runtime::validate_transaction");
+	let res = if has_v2 {
+		runtime_api.validate_transaction(&at, source, uxt)
+	} else {
+		#[allow(deprecated)] // old validate_transaction
+		runtime_api.validate_transaction_before_version_2(&at, uxt)
+	};
+
+	res.map_err(|e| Error::RuntimeApi(e.to_string()))
+}
+
+impl<Client, Block> FullChainApi<Client, Block>
+where
+	Block: BlockT,
+	Client: ProvideRuntimeApi<Block> + BlockBackend<Block> + BlockIdTo<Block>,
+	Client: Send + Sync + 'static,
+	Client::Api: TaggedTransactionQueue<Block>,
+	sp_api::ApiErrorFor<Client, Block>: Send + std::fmt::Display,
+{
+	/// Validates a transaction by calling into the runtime, same as
+	/// `validate_transaction` but blocks the current thread when performing
+	/// validation. Only implemented for `FullChainApi` since we can call into
+	/// the runtime locally.
+	pub fn validate_transaction_blocking(
+		&self,
+		at: &BlockId<Block>,
+		source: TransactionSource,
+		uxt: sc_transaction_graph::ExtrinsicFor<Self>,
+	) -> error::Result<TransactionValidity> {
+		validate_transaction_blocking(&*self.client, at, source, uxt)
+	}
+}
+
 /// The transaction pool logic for light client.
 pub struct LightChainApi<Client, F, Block> {
 	client: Arc<Client>,
diff --git a/client/transaction-pool/src/lib.rs b/client/transaction-pool/src/lib.rs
index ee2fd4a199f2c..eaddcbe83a16b 100644
--- a/client/transaction-pool/src/lib.rs
+++ b/client/transaction-pool/src/lib.rs
@@ -352,6 +352,59 @@ impl<PoolApi, Block> TransactionPool for BasicPool<PoolApi, Block>
 	}
 }
 
+impl<Block, Client> sp_transaction_pool::LocalTransactionPool
+	for BasicPool<FullChainApi<Client, Block>, Block>
+where
+	Block: BlockT,
+	Client: sp_api::ProvideRuntimeApi<Block>
+		+ sc_client_api::BlockBackend<Block>
+		+ sp_runtime::traits::BlockIdTo<Block>,
+	Client: Send + Sync + 'static,
+	Client::Api: sp_transaction_pool::runtime_api::TaggedTransactionQueue<Block>,
+	sp_api::ApiErrorFor<Client, Block>: Send + std::fmt::Display,
+{
+	type Block = Block;
+	type Hash = sc_transaction_graph::ExtrinsicHash<FullChainApi<Client, Block>>;
+	type Error = <FullChainApi<Client, Block> as ChainApi>::Error;
+
+	fn submit_local(
+		&self,
+		at: &BlockId<Self::Block>,
+		xt: sp_transaction_pool::LocalTransactionFor<Self>,
+	) -> Result<Self::Hash, Self::Error> {
+		use sc_transaction_graph::ValidatedTransaction;
+		use sp_runtime::traits::SaturatedConversion;
+		use sp_runtime::transaction_validity::TransactionValidityError;
+
+		let validity = self
+			.api
+			.validate_transaction_blocking(at, TransactionSource::Local, xt.clone())?
+			.map_err(|e| {
+				Self::Error::Pool(match e {
+					TransactionValidityError::Invalid(i) => i.into(),
+					TransactionValidityError::Unknown(u) => u.into(),
+				})
+			})?;
+
+		let (hash, bytes) = self.pool.validated_pool().api().hash_and_length(&xt);
+		let block_number = self
+			.api
+			.block_id_to_number(at)?
+			.ok_or_else(|| error::Error::BlockIdConversion(format!("{:?}", at)))?;
+
+		let validated = ValidatedTransaction::valid_at(
+			block_number.saturated_into::<u64>(),
+			hash.clone(),
+			TransactionSource::Local,
+			xt,
+			bytes,
+			validity,
+		);
+
+		self.pool.validated_pool().submit(vec![validated]).remove(0)
+	}
+}
+
 #[cfg_attr(test, derive(Debug))]
 enum RevalidationStatus<N> {
 	/// The revalidation has never been completed.
diff --git a/primitives/transaction-pool/src/pool.rs b/primitives/transaction-pool/src/pool.rs
index 2824c96f30ab6..b00c283ac743c 100644
--- a/primitives/transaction-pool/src/pool.rs
+++ b/primitives/transaction-pool/src/pool.rs
@@ -141,6 +141,8 @@ pub type BlockHash<P> = <<P as TransactionPool>::Block as BlockT>::Hash;
 pub type TransactionFor<P> = <<P as TransactionPool>::Block as BlockT>::Extrinsic;
 /// Type of transactions event stream for a pool.
 pub type TransactionStatusStreamFor<P> = TransactionStatusStream<TxHash<P>, BlockHash<P>>;
+/// Transaction type for a local pool.
+pub type LocalTransactionFor<P> = <<P as LocalTransactionPool>::Block as BlockT>::Extrinsic;
 
 /// Typical future type used in transaction pool api.
 pub type PoolFuture<T, E> = std::pin::Pin<Box<dyn Future<Output=Result<T, E>> + Send>>;
@@ -273,6 +275,28 @@ pub trait MaintainedTransactionPool: TransactionPool {
 	fn maintain(&self, event: ChainEvent<Self::Block>) -> Pin<Box<dyn Future<Output=()> + Send>>;
 }
 
+/// Transaction pool interface for submitting local transactions that exposes a
+/// blocking interface for submission.
+pub trait LocalTransactionPool: Send + Sync {
+	/// Block type.
+	type Block: BlockT;
+	/// Transaction hash type.
+	type Hash: Hash + Eq + Member + Serialize;
+	/// Error type.
+	type Error: From<crate::error::Error> + crate::error::IntoPoolError;
+
+	/// Submits the given local unverified transaction to the pool blocking the
+	/// current thread for any necessary pre-verification.
+	/// NOTE: It MUST NOT be used for transactions that originate from the
+	/// network or RPC, since the validation is performed with
+	/// `TransactionSource::Local`.
+	fn submit_local(
+		&self,
+		at: &BlockId<Self::Block>,
+		xt: LocalTransactionFor<Self>,
+	) -> Result<Self::Hash, Self::Error>;
+}
+
 /// An abstraction for transaction pool.
 ///
 /// This trait is used by offchain calls to be able to submit transactions.
@@ -291,7 +315,7 @@ pub trait OffchainSubmitTransaction<Block: BlockT>: Send + Sync {
 	) -> Result<(), ()>;
 }
 
-impl<TPool: TransactionPool> OffchainSubmitTransaction<TPool::Block> for TPool {
+impl<TPool: LocalTransactionPool> OffchainSubmitTransaction<TPool::Block> for TPool {
 	fn submit_at(
 		&self,
 		at: &BlockId<TPool::Block>,
@@ -303,15 +327,14 @@ impl<TPool: TransactionPool> OffchainSubmitTransaction<TPool::Block> for TPool {
 			extrinsic
 		);
 
-		let result = futures::executor::block_on(self.submit_one(
-				&at, TransactionSource::Local, extrinsic,
-		));
+		let result = self.submit_local(&at, extrinsic);
 
-		result.map(|_| ())
-			.map_err(|e| log::warn!(
+		result.map(|_| ()).map_err(|e| {
+			log::warn!(
 				target: "txpool",
 				"(offchain call) Error submitting a transaction to the pool: {:?}",
 				e
-			))
+			)
+		})
 	}
 }