diff --git a/chain_service/controllers/run_chain.py b/chain_service/controllers/run_chain.py
index 37b1fd5..69c4abc 100644
--- a/chain_service/controllers/run_chain.py
+++ b/chain_service/controllers/run_chain.py
@@ -1,4 +1,4 @@
-from chain_service.schema.run_chain import RunChainInput
+from chain_service.schema.run_chain import RunChainInput, AbortChainInput
 
 from chain_service.dependencies.chain_repository import ChainRepositoryDependency
 
@@ -10,6 +10,10 @@ from chain_service.dependencies.progress_chain_runner_service import (
     ProgressChainRunnerServiceDependency,
 )
 
+from chain_service.dependencies.running_chain_repository import (
+    RunningChainRepositoryDependency,
+)
+
 from chain_service.database.models.progress_chain import ProgressChain
 
 import asyncio
@@ -25,10 +29,15 @@ async def run_chain_controller(
     chain_repository: ChainRepositoryDependency,
     progress_chain_repository: ProgressChainRepositoryDependency,
     progress_chain_runner_service: ProgressChainRunnerServiceDependency,
+    running_chain_repository: RunningChainRepositoryDependency,
 ):
     try:
         assert (chain := await chain_repository.get_by_id(run_chain_input.chain_id))
 
+        if await running_chain_repository.exists(str(chain.id)):
+            logger.error(f"Chain {chain.id} is already running")
+            raise HTTPException(status_code=409, detail="Chain is already running")
+
         progress_chain = ProgressChain.create_from_chain(
             chain=chain,
             task_id=run_chain_input.task_id,
@@ -38,6 +47,8 @@ async def run_chain_controller(
         )
 
         progress_chain = await progress_chain_repository.upsert(progress_chain)
+        await running_chain_repository.add(str(chain.id))
+
         asyncio.create_task(progress_chain_runner_service.process(progress_chain))
         return {}
 
@@ -48,3 +59,25 @@ async def run_chain_controller(
     except Exception:
         logger.exception("Error during run chain")
         raise HTTPException(status_code=500, detail="Error during run chain")
+
+
+@router.post("/abort_chain")
+async def abort_chain_controller(
+    abort_chain_input: AbortChainInput,
+    running_chain_repository: RunningChainRepositoryDependency,
+):
+    try:
+        assert await running_chain_repository.exists(abort_chain_input.chain_id)
+        await running_chain_repository.delete(abort_chain_input.chain_id)
+        return {}
+
+    except AssertionError:
+        logger.warning("Cannot abort a chain that isn't running")
+
+        raise HTTPException(
+            status_code=409, detail="Cannot abort a chain that isn't running"
+        )
+
+    except Exception:
+        logger.exception("Error during chain abortion")
+        raise HTTPException(status_code=400, detail="Chain abortion error :)")
diff --git a/chain_service/schema/run_chain.py b/chain_service/schema/run_chain.py
index 91ba262..38266ea 100644
--- a/chain_service/schema/run_chain.py
+++ b/chain_service/schema/run_chain.py
@@ -12,3 +12,7 @@ class RunChainInput(BaseModel):
 
     class Config(BaseConfig):
         pass
+
+
+class AbortChainInput(BaseModel):
+    chain_id: str