diff --git a/miner/src/memory_pool.rs b/miner/src/memory_pool.rs
index 53e8cd68..44c665a8 100644
--- a/miner/src/memory_pool.rs
+++ b/miner/src/memory_pool.rs
@@ -333,6 +333,10 @@ impl Storage {
 		}
 	}
 
+	pub fn read_by_hash(&self, h: &H256) -> Option<&Transaction> {
+		self.by_hash.get(h).map(|e| &e.transaction)
+	}
+
 	pub fn read_with_strategy(&self, strategy: OrderingStrategy) -> Option<H256> {
 		match strategy {
 			OrderingStrategy::ByTimestamp => self.references.ordered.by_storage_index.iter().map(|entry| entry.hash.clone()).nth(0),
@@ -575,6 +579,11 @@ impl MemoryPool {
 		self.storage.remove_by_hash(h).map(|entry| entry.transaction)
 	}
 
+	/// Reads single transaction by its hash.
+	pub fn read_by_hash(&self, h: &H256) -> Option<&Transaction> {
+		self.storage.read_by_hash(h)
+	}
+
 	/// Reads hash of the 'top' transaction from the `MemoryPool` using selected strategy.
 	/// Ancestors are always returned before descendant transactions.
 	pub fn read_with_strategy(&mut self, strategy: OrderingStrategy) -> Option<H256> {
diff --git a/sync/src/synchronization_chain.rs b/sync/src/synchronization_chain.rs
index 293e1bc2..648a5551 100644
--- a/sync/src/synchronization_chain.rs
+++ b/sync/src/synchronization_chain.rs
@@ -610,6 +610,12 @@ impl Chain {
 		}
 	}
 
+	/// Get transaction by hash (if it's in memory pool or verifying)
+	pub fn transaction_by_hash(&self, hash: &H256) -> Option<Transaction> {
+		self.verifying_transactions.get(hash).cloned()
+			.or_else(|| self.memory_pool.read_by_hash(hash).cloned())
+	}
+
 	/// Insert transaction to memory pool
 	pub fn insert_verified_transaction(&mut self, transaction: Transaction) {
 		self.memory_pool.insert_verified(transaction);
diff --git a/sync/src/synchronization_server.rs b/sync/src/synchronization_server.rs
index 8bb12b5d..c56205e6 100644
--- a/sync/src/synchronization_server.rs
+++ b/sync/src/synchronization_server.rs
@@ -189,6 +189,15 @@ impl SynchronizationServer {
 										None => unknown_items.push(item),
 									}
 								},
+								InventoryType::MessageTx => {
+									match chain.transaction_by_hash(&item.hash) {
+										Some(transaction) => {
+											let task = IndexedServerTask::new(ServerTask::ReturnTransaction(transaction), ServerTaskIndex::None);
+											new_tasks.push(task);
+										},
+										None => unknown_items.push(item),
+									}
+								},
 								_ => (), // TODO: process other inventory types
 							}
 						}
@@ -758,4 +767,61 @@ pub mod tests {
 		let tasks = DummyTaskExecutor::wait_tasks(executor);
 		assert_eq!(tasks, vec![]);
 	}
+
+	#[test]
+	fn server_getdata_responds_notfound_when_transaction_is_inaccessible() {
+		let (_, executor, server) = create_synchronization_server();
+		// when asking for unknown transaction or transaction that is already in the storage
+		let inventory = vec![
+			InventoryVector {
+				inv_type: InventoryType::MessageTx,
+				hash: H256::default(),
+			},
+			InventoryVector {
+				inv_type: InventoryType::MessageTx,
+				hash: test_data::genesis().transactions[0].hash(),
+			},
+		];
+		server.serve_getdata(0, FilteredInventory::with_unfiltered(inventory.clone())).map(|t| server.add_task(0, t));
+		// => respond with notfound
+		let tasks = DummyTaskExecutor::wait_tasks(executor);
+		assert_eq!(tasks, vec![Task::SendNotFound(0, inventory, ServerTaskIndex::None)]);
+	}
+
+	#[test]
+	fn server_getdata_responds_transaction_when_transaction_is_in_memory() {
+		let (chain, executor, server) = create_synchronization_server();
+		let tx_verifying: Transaction = test_data::TransactionBuilder::with_output(10).into();
+		let tx_verifying_hash = tx_verifying.hash();
+		let tx_verified: Transaction = test_data::TransactionBuilder::with_output(20).into();
+		let tx_verified_hash = tx_verified.hash();
+		// given in-memory transaction
+		{
+			let mut chain = chain.write();
+			chain.verify_transaction(tx_verifying_hash.clone(), tx_verifying.clone());
+			chain.insert_verified_transaction(tx_verified.clone());
+		}
+		// when asking for known in-memory transaction
+		let inventory = vec![
+			InventoryVector {
+				inv_type: InventoryType::MessageTx,
+				hash: tx_verifying_hash,
+			},
+			InventoryVector {
+				inv_type: InventoryType::MessageTx,
+				hash: tx_verified_hash,
+			},
+		];
+		server.serve_getdata(0, FilteredInventory::with_unfiltered(inventory)).map(|t| server.add_task(0, t));
+		// => respond with transaction
+		let mut tasks = DummyTaskExecutor::wait_tasks(executor.clone());
+		// 2 tasks => can be situation when single task is ready
+		if tasks.len() != 2 {
+			tasks.extend(DummyTaskExecutor::wait_tasks_for(executor, 100));
+		}
+		assert_eq!(tasks, vec![
+			Task::SendTransaction(0, tx_verifying),
+			Task::SendTransaction(0, tx_verified),
+		]);
+	}
 }