diff --git a/src/entities/chain/api/upsert.ts b/src/entities/chain/api/upsert.ts
new file mode 100644
index 0000000..da6c6fa
--- /dev/null
+++ b/src/entities/chain/api/upsert.ts
@@ -0,0 +1,13 @@
+import { chainSchema, type Chain } from "../schema";
+import { getAxios } from "@/shared/lib/getAxios";
+
+export async function upsertChain(chain: Chain) {
+  const axios = getAxios();
+
+  try {
+    const response = await axios.post("/chain", chain);
+    return chainSchema.parse(response.data);
+  } catch {
+    return null;
+  }
+}
diff --git a/src/entities/chain/model.ts b/src/entities/chain/model.ts
index fc33b5e..201169e 100644
--- a/src/entities/chain/model.ts
+++ b/src/entities/chain/model.ts
@@ -4,8 +4,15 @@ import type { Chain } from "./schema";
 interface ChainState {
   chains?: Chain[];
   setChains: (chains: Chain[]) => void;
+  addChain: (chain: Chain) => void;
 }
 
 export const useChainState = create<ChainState>((set) => ({
   setChains: (chains) => set({ chains }),
+
+  addChain: (chain) =>
+    set((state) => {
+      if (!state.chains) return { chains: [chain] };
+      return { chains: [...state.chains, chain] };
+    }),
 }));