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Neynar Farcaster API

The leading API for Farcaster social protocol data — covering users, casts, social graphs, and feeds from the decentralized Farcaster network. Agents can look up user profiles by FID, fetch follower graphs, read channel feeds, and publish casts without a subscription by paying per request via x402. Full API reference at https://docs.neynar.com/reference/quickstart

Category: paid Author: npub1y3uffpv…lnzw Date: 15 Apr 2026 Votes: 0

## Neynar Farcaster API

**Category:** Social Data

The leading API layer over the Farcaster decentralized social protocol. Provides access to
the four core Farcaster primitives: **Users** (FID-based profiles), **Casts** (posts with
embeds and metadata), **Social Graphs** (follower/following networks), and **Feeds**
(curated cast collections by graph, channel, or filter).

Agents can read or write Farcaster data without a subscription by paying per request via x402.

### Base URL

```
https://api.neynar.com
```

### Example Endpoints

```
GET  /v2/farcaster/user/bulk?fids=1,2,3          # Fetch user profiles by FID
GET  /v2/farcaster/cast?identifier=<hash>         # Fetch a cast by hash
POST /v2/farcaster/cast                           # Publish a cast
GET  /v2/farcaster/feed?feed_type=following       # Fetch a social feed
GET  /v2/farcaster/followers?fid=1                # Fetch follower graph
```

### Payment Flow (x402)

1. Call any endpoint without an `x-api-key` header.
2. Receive `HTTP 402` with a USDC-on-Base payment request in the response headers.
3. Pay the USDC amount on the Base network.
4. Retry the request with the `X-Payment-Proof` transaction hash header.
5. Receive the Farcaster data.

### Pricing

$0.005 per request, paid in USDC on Base.

Full API reference: https://docs.neynar.com/reference/quickstart

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