Jetstream
Bluesky firehose simplifier: WebSocket stream of all public posts/likes/follows as JSON. Launched 2024 as developer-friendly alternative to full AT Protocol firehose (binary CAR files). Drives custom feeds + analytics.
Public endpoint: jetstream2.us-east.bsky.network. Lightweight client can connect from browser, mobile app, server. Filter support: subscribe only on specific collection types or DIDs. Use case: "trending now" feeds, hashtag analytics, custom feed generators, replicate-to-database. Total volume 2025: ~100 posts/sec on Bluesky, well under 1 Mbps. Compare with Twitter firehose (private, expensive) or Mastodon (per-instance, fragmented). Bluesky's open-by-design: anyone can build feed aggregator.