# Farcaster Verifications

> Farcaster Verifications is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Resolves a Farcaster FID or username to all cryptographically verified on-chain wallet addresses (Ethereum and Solana) linked to that identity.

## Facts

- Endpoint: GET https://payai.agentstools.dev/farcaster/verifications
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/farcaster-verifications-fc0f46a8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tSq_pZ8_GbQteg2JeHnQZ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability farcaster-verifications-fc0f46a8
```

Example prompt: Can you look up all the verified on-chain wallet addresses — both Ethereum and Solana — linked to the Farcaster username 'vitalik.eth'?

## When to prefer this

Choose this endpoint when you need the forward direction of Farcaster identity resolution — going from a known Farcaster identity (FID or username) to verified wallet addresses. It is ideal for airdrop targeting, on-chain reputation checks, payment routing to Farcaster users, and provenance verification. Prefer this over generic ENS resolvers when the identity is specifically a Farcaster profile, as it returns all verified addresses (including Solana) plus provenance, not just a primary ENS-linked address.

## Known failure modes

- FID not found — returns empty or error if the FID does not exist
- Username not found — unrecognized fname or ENS returns an error
- Neither fid nor username provided — missing required query parameter causes a 400-level error
- Rate limit or payment failure — x402 payment not accepted results in 402 response
- Farcaster node unavailable — upstream Farcaster hub timeout causes 5xx error

## How this service works

Resolve a Farcaster identity to its verified on-chain wallets. Give one of fid or username and get every cryptographically verified address (Ethereum and Solana) linked to that FID, plus the in-profile primary Ethereum address and provenance. The forward identity to wallet direction for reputation and provenance work.

## Output

Returns all cryptographically verified Ethereum and Solana wallet addresses linked to the given Farcaster FID or username, the in-profile primary Ethereum address, and provenance information indicating how each address was verified.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "fid": {
       "type": "integer",
       "minimum": 1,
       "description": "Farcaster ID (FID), a positive integer"
      },
      "username": {
       "type": "string",
       "description": "Farcaster username (fname or ENS), without the at-sign"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/farcaster-verifications-fc0f46a8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from payai.agentstools.dev](https://www.zero.xyz/host/payai.agentstools.dev/llms.txt)