AT Protocol (atproto)

AT Protocol (Authenticated Transfer Protocol) is an open, federated social networking protocol developed by Bluesky Social PBC that powers the Bluesky social network and its 40M+ users. The protocol exposes a public HTTP XRPC API organized under Lexicon schemas covering identity (DIDs and handles), repository management, feed generation, labeling, and moderation. Developers can access a public firehose WebSocket event stream without API keys, and write operations use OAuth 2.0 or JWT bearer tokens for authentication.

• APIs.json: https://raw.githubusercontent.com/api-evangelist/atproto/refs/heads/main/apis.yml
• Naftiko Fleet: https://github.com/naftiko/fleet?utm_source=api-evangelist&utm_medium=readme&utm_campaign=atproto-api-evangelist&utm_content=repo

Tags

Social Networking, Decentralized, Federated, Open Source, Bluesky, Fediverse, Identity, XRPC, Lexicon

APIs

API	Description	Docs
AT Protocol Core API (com.atproto)	Core XRPC API covering server identity, repository management, account administration, moderation/labeling, and data sync	Docs
Bluesky Application API (app.bsky)	Application-layer Lexicon API for feeds, actors, graph, notifications, and video	Docs
AT Protocol Firehose	Public WebSocket event stream for real-time access to all public network activity — no API key required	Docs

Plans / Rate Limits / FinOps

Resource	File
Plans & Pricing	plans/atproto-plans-pricing.yml
Rate Limits	rate-limits/atproto-rate-limits.yml
FinOps	finops/atproto-finops.yml

Timestamps

• Created: 2026-06-12
• Modified: 2026-06-12

Common Properties

Type	URL
Website	https://atproto.com/
Documentation	https://atproto.com/guides/overview
Blog	https://atproto.com/blog
GitHub Organization	https://github.com/bluesky-social
LinkedIn	https://www.linkedin.com/company/bluesky-pbc
X (Twitter)	https://twitter.com/at_protocol
Status Page	https://status.bsky.app/
TypeScript SDK	https://github.com/bluesky-social/atproto/tree/main/packages
Go SDK (Indigo)	https://github.com/bluesky-social/indigo

Maintainers

• Kin Lane — kin@apievangelist.com