[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [local‑first/Protocol](https://evolu.dev/docs/api-reference/common/local-first/Protocol) › applyProtocolMessageAsRelay

```ts
function applyProtocolMessageAsRelay(
  inputMessage: Uint8Array,
  options?: ApplyProtocolMessageAsRelayOptions,
  version?: number &
    Brand<"NonNaN"> &
    Brand<"Finite"> &
    Brand<"Int"> &
    Brand<"NonNegative">,
): Task<
  ApplyProtocolMessageAsRelayResult,
  ProtocolInvalidDataError,
  StorageDep
>;
```

Defined in: [packages/common/src/local-first/Protocol.ts:1097](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/local-first/Protocol.ts#L1097)