# Farcaster

**Canonical:** https://apis.io/providers/farcaster/  
**Website:** https://www.farcaster.xyz/  
**APIs profiled:** 15

Farcaster is a decentralised social protocol built on Snapchain, an append-only state machine that stores casts, reactions, follows, and user profile data. The protocol publishes a Hub / Snapchain reference implementation, the Mini Apps SDK (formerly Frames) for distributing interactive apps inside Farcaster feeds, Sign In with Farcaster (SIWF) for authentication, and AuthKit for React-based sign-in. The Warpcast client (now rebranded Farcaster app at farcaster.xyz) is the primary consumer surface. Indexer providers such as Neynar host scaled Hub APIs and value-added read / write / webhook APIs at api.neynar.com.

## Kin Score — 30.6 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 30.6).

| Facet | Score |
|---|---|
| Discoverability | 68.5 |
| Contract Quality | 50.6 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 9.5 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

## Agent readiness — 20.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Free — onboarding: unknown, pricing: free, trial: no (confidence: medium).

## APIs (15)

- **Snapchain / Hub API** — Query interface for Farcaster's Snapchain network - read casts, reactions, follows, user data, and verifications by FID; submit signed messages; and run a Snapchain node for ful...
- **Farcaster Mini Apps SDK** — JavaScript SDK for building Mini Apps (the evolution of Frames) that run inside Farcaster feeds and clients. Provides host bridge, context, wallet actions, notifications, and an...
- **Sign In with Farcaster (SIWF)** — Authentication flow that lets users sign in to third-party apps with their Farcaster identity, returning a verified FID and optional profile data. Backed by EIP-4361-style signe...
- **Farcaster AuthKit (React)** — React toolkit wrapping Sign In with Farcaster - provides hooks and components for the QR-code / deep-link handoff to a Farcaster client and returns the verified user context to ...
- **Neynar Hosted Farcaster API** — Third-party indexer providing hosted Hub access, indexed read APIs (users, casts, channels, feeds), write APIs (publish casts, reactions, follows), webhooks for real-time events...
- **Warpcast / Farcaster Client API** — Client-side API exposed by the Warpcast / Farcaster app for client-specific surfaces (channels, mentions, direct casts, mini-app contexts) layered above the Snapchain protocol A...
- **Farcaster Casts API** — The Casts API from Farcaster — 4 operation(s) for casts.
- **Farcaster Events API** — The Events API from Farcaster — 2 operation(s) for events.
- **Farcaster Info API** — The Info API from Farcaster — 2 operation(s) for info.
- **Farcaster Links API** — The Links API from Farcaster — 3 operation(s) for links.
- **Farcaster OnChain API** — The OnChain API from Farcaster — 4 operation(s) for onchain.
- **Farcaster Reactions API** — The Reactions API from Farcaster — 4 operation(s) for reactions.
- **Farcaster Submit API** — The Submit API from Farcaster — 3 operation(s) for submit.
- **Farcaster UserData API** — The UserData API from Farcaster — 4 operation(s) for userdata.
- **Farcaster Verifications API** — The Verifications API from Farcaster — 1 operation(s) for verifications.

## Agentic access (1)

- **Farcaster Agentic Access** — 27 operations · 3 acting

## Security (1)

- **Farcaster Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Plans (1)

- **Farcaster Plans Pricing**

## Tags

Social, Decentralized, Protocol, Mini Apps, Frames, Authentication, Web3, SDK

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/farcaster/). Scores are computed from the provider's own public artifacts under a published rubric.