Welcome to the Atmosphere
The AT Protocol is an open, decentralized network for building social applications.
Specs
Repository
Self-authenticating storage for public account content.
Lexicon
A schema definition language for ATProto.
HTTP API (XRPC)
Cross-system queries and procedures over HTTP.
URI Scheme
A URI scheme for addressing ATProto repository data.
Learn more
Glossary of terms
What's a PDS? an AppView? a DID? If you're feeling a little bowled over by new concepts, give this glossary a look.
The fast intro to building on ATProto
In this guide, we build a simple multi-user app that publishes your current "status" as an emoji.
ATProto for distributed systems engineers
In this article we explore AT Proto from the perspective of distributed backend engineering.
What is Lexicon, and how do I use it to make a schema?
This guide will introduce you to Lexicon and get you started with building your own schemas.
Building the Social Internet with Bluesky's AT Protocol
An interview between Dan Abramov and TBD about how the AT Protocol works. A great introduction for people new to the topic!
Bluesky and the AT Protocol: Usable Decentralized Social Media
A whitepaper authored by Martin Kleppman and the AT Protocol team.
How does Bluesky work?
A blog post by Steve Klabnik describing how Bluesky and ATProto work at a high level.
Looking for the Bluesky API docs?
Go to docs.bsky.app for Bluesky-specific documentation.