diff --git a/chain_service/database/models/running_chain.py b/chain_service/database/models/running_chain.py
new file mode 100644
index 0000000..4fe8057
--- /dev/null
+++ b/chain_service/database/models/running_chain.py
@@ -0,0 +1,9 @@
+from .base import BaseConfig
+from pydantic import BaseModel
+
+
+class RunningChain(BaseModel):
+    chain_id: str
+
+    class Config(BaseConfig):
+        pass
diff --git a/chain_service/dependencies/running_chain_repository.py b/chain_service/dependencies/running_chain_repository.py
new file mode 100644
index 0000000..fb65f00
--- /dev/null
+++ b/chain_service/dependencies/running_chain_repository.py
@@ -0,0 +1,16 @@
+from .database import DatabaseDependency
+from chain_service.repositories.running_chain import RunningChainRepository
+
+from fastapi import Depends
+from typing import Annotated
+
+
+def get_running_chain_repository(
+    database: DatabaseDependency,
+) -> RunningChainRepository:
+    return RunningChainRepository(database=database)
+
+
+RunningChainRepositoryDependency = Annotated[
+    RunningChainRepository, Depends(get_running_chain_repository)
+]
diff --git a/chain_service/repositories/running_chain.py b/chain_service/repositories/running_chain.py
new file mode 100644
index 0000000..8f326d1
--- /dev/null
+++ b/chain_service/repositories/running_chain.py
@@ -0,0 +1,23 @@
+from chain_service.database.database import Database
+from chain_service.database.models.running_chain import RunningChain
+
+from uuid import UUID
+from loguru import logger
+
+
+class RunningChainRepository:
+
+    def __init__(self, database: Database):
+        self.collection = database.get_collection("running_chains")
+
+    async def add(self, chain_id: str):
+        query = payload = {"chainId": chain_id}
+        await self.collection.replace_one(query, payload, upsert=True)
+
+    async def exists(self, chain_id: str) -> bool:
+        query = {"chainId": chain_id}
+        return bool(await self.collection.find_one(query))
+
+    async def delete(self, chain_id: str):
+        query = {"chainId": chain_id}
+        await self.collection.delete_one(query)