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https://atproto.com/

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Title:AT Protocol

Description:

HTML Size:113 KB

Markdown Size:3 KB

Fetched At:November 18, 2025

Page Structure

h2Home

h2Building apps

h2Guides

h2Specs

h1Welcome to the Atmosphere

h2Guides

h3Quickstart

h3Self-host

h3Glossary

h3FAQ

h2Specs

h3Repository

h3Lexicon

h3HTTP API (XRPC)

h3URI Scheme

h2Learn more

h2Glossary of terms

h2The fast intro to building on ATProto

h2ATProto for distributed systems engineers

h2What is Lexicon, and how do I use it to make a schema?

h2ATProto Ethos

h3Web Without Walls - Talk at React Universe 2024

h3Make Identity Central Again, with Bluesky's Jay Graber

h3Bluesky and the AT Protocol: Usable Decentralized Social Media

h2Looking for the Bluesky API docs?

Markdown Content

AT Protocol

Find something...K

- SDKs
- Blog
- GitHub
EnglishPortuguês日本語한국어

- API
- Documentation
- Support
- ## Home

- Introduction
- ATProto Ethos
- SDKs
- Glossary
- FAQ
- ## Building apps

- Quick start
- Cookbook ⧉
- Distributed Systems
- ## Guides

- Overview
- Identity
- Data Repositories
- Schemas & Lexicon
- Lexinomicon
- PDS Self-Hosting
- Going to production
- OAuth Introduction
- Account Migration
- ## Specs

- AT Protocol
- Data Model
- Lexicon
- Cryptography
- Accounts
- Repository
- Blobs
- Labels
- HTTP API (XRPC)
- OAuth
- Event Stream
- Sync
- DID
- Handle
- NSID
- TID
- Record Key
- URI Scheme

# Welcome to the Atmosphere

The AT Protocol is an open, decentralized network for building social applications.

QuickstartExplore SDKs

## Guides

### Quickstart

Create an application and start building.

### Self-host

Learn how to set up your own personal data server.

### Glossary

Definitions for all the terminology used in AT Protocol.

### FAQ

Frequently Asked Questions about the Atmosphere.

## 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

Guide

## 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.

Keep reading

Guide

## 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.

Keep reading

Article

## ATProto for distributed systems engineers

In this article we explore AT Proto from the perspective of distributed backend engineering.

Keep reading

Guide

## 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.

Keep reading

Article

## ATProto Ethos

A deep dive into the philosophical and aesthetic principles underlying the design of AT Protocol.

Keep reading

### Web Without Walls - Talk at React Universe 2024

Talk

An introduction to the AT Protocol presented by Dan Abramov at React Universe Conf 2024

### Make Identity Central Again, with Bluesky's Jay Graber

Interview

An interview between Jay Graber and Flipboard CEO Mike McCue about making social more like the Web.

### Bluesky and the AT Protocol: Usable Decentralized Social Media

Whitepaper

A whitepaper authored by Martin Kleppman and the AT Protocol team.

## Looking for the Bluesky API docs?

Go to docs.bsky.app for Bluesky-specific documentation.

NextATProto Ethos