Bluesky firehose
A real-time stream of all public events in the Bluesky network — every post, like, follow, and repost as they happen. The open firehose is the foundation for feed generators, analytics tools, bots, and labelers.
Tech: a "relay" (formerly the "Big Graph Service") aggregates events from all PDSes and broadcasts them as a WebSocket stream. Anyone can connect and consume the whole network's activity in real time — radically open compared to Twitter's API, which became expensive and closed. Volume: millions of events per day → requires some infrastructure to handle. Use case: building a custom feed (filtering the firehose), research, trend detection, moderation. Because it's so much data, Jetstream was created — a lightweight, JSON-based, filterable version that's easier to consume. The open firehose is a core pillar of Bluesky's "open network" promise.