# AT Protocol Relay & Firehose

**Canonical:** https://apis.io/apis/at-protocol/relay-firehose/  
**Provider:** AT Protocol — https://apis.io/providers/at-protocol/  
**Base URL:** wss://bsky.network  
**Documentation:** https://atproto.com/guides/glossary

AT Protocol Relay & Firehose is one of 12 APIs that [AT Protocol](https://apis.io/providers/at-protocol/) publishes on the [APIs.io](https://apis.io/) network, described by an AsyncAPI event-driven specification. Tagged areas include Relay, Firehose, WebSocket, Streaming, and Sync. The published artifact set on APIs.io includes an API reference and an AsyncAPI specification.

The Relay aggregates the com.atproto.sync.subscribeRepos firehose across PDS hosts and re-broadcasts the combined event stream over WebSocket. AppViews and indexers subscribe to a Relay to get a near-real-time view of every public record written on the network without polling individual PDS instances.

## Machine-readable artifacts (3)

- **Specification** — https://atproto.com/specs/sync
- **Reference** — https://github.com/bluesky-social/indigo
- **AsyncAPI** — https://raw.githubusercontent.com/api-evangelist/at-protocol/refs/heads/main/asyncapi/at-protocol-asyncapi.yml

## Other AT Protocol APIs (11)

- [AT Protocol XRPC API](https://apis.io/apis/at-protocol/atproto-xrpc/)
- [AT Protocol Lexicon Schemas](https://apis.io/apis/at-protocol/lexicon/)
- [Personal Data Server (PDS) API](https://apis.io/apis/at-protocol/pds-api/)
- [Bluesky AppView API](https://apis.io/apis/at-protocol/bsky-appview/)
- [AT Protocol Identity (DID & Handles)](https://apis.io/apis/at-protocol/identity-did/)
- [AT Protocol Actor API](https://apis.io/apis/at-protocol/at-protocol-actor-api/)
- [AT Protocol Feed API](https://apis.io/apis/at-protocol/at-protocol-feed-api/)
- [AT Protocol Graph API](https://apis.io/apis/at-protocol/at-protocol-graph-api/)
- [AT Protocol Identity API](https://apis.io/apis/at-protocol/at-protocol-identity-api/)
- [AT Protocol Repo API](https://apis.io/apis/at-protocol/at-protocol-repo-api/)
- [AT Protocol Server API](https://apis.io/apis/at-protocol/at-protocol-server-api/)

## Tags

Relay, Firehose, WebSocket, Streaming, Sync

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/at-protocol/relay-firehose/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/at-protocol/.