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Farcaster User Profile Lookup
x402
Farcaster User Profile Lookup is a paid API for AI agents from api.web3identity.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-13).
Retrieve a Farcaster user's profile data (FID, username, display name, followers) by FID, username, or connected wallet address
Price / call$0.02
Success—
StatusUnknown
How this service works
Get Farcaster user profile by FID, username, or connected address
Output
Returns a JSON object containing the user's Farcaster ID (FID), username, display name, and follower count for the matched Farcaster account.
Example use cases
Verify creator identity before collaboration
“I just got a message from someone claiming to be a well-known crypto creator. Can you look them up on Farcaster using their wallet address 0x1234... and tell me their actual username, display name, and follower count so I can verify they're legit?”
Enrich blockchain transaction with social data
“We're tracking a major wallet address 0x5678... that just made a huge transaction. Can you pull their Farcaster profile to see who's behind it? I need their username, FID, and how many followers they have.”
Build user directory for web3 community
“I'm creating a directory of influential voices in our DAO. Can you look up these Farcaster FIDs—12345, 67890, and 54321—and get me each person's username, display name, and follower count so I can rank them?”
Technical details
Endpoint
GEThttps://api.web3identity.com/api/farcaster/vWhen to prefer
Use this endpoint when you need to resolve a Farcaster identity from a known FID, username, or Ethereum wallet address — especially useful for enriching on-chain data with social identity context, verifying Farcaster presence, or displaying human-readable profile information in a web3 context.
Side effects
- User not found for given FID/username/address — returns empty or 404-style response
- Invalid input type or missing required 'type' field — schema validation error
- Wallet address not connected to any Farcaster account — empty result
- Rate limiting or payment failure — 402 payment required or 429 too many requests
- Malformed FID (non-numeric) or username format error
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"identifier": "vitalik.eth",
"identifierType": "username"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"bio": "Technowatermelon. Elder Millenial. Building Farcaster. \n\nnf.td/varun",
"fid": 2,
"avatar": "https://imagedelivery.net/BXluQx4ige9GuW0Ia56BHw/e3d80f99-f7c0-4b04-dcad-557593d85500/original",
"source": "warpcast",
"username": "v",
"verified": false,
"followers": 262059,
"following": 1854,
"timestamp": "2026-06-13T04:18:44.859Z",
"displayName": "Varun Srinivasan"
}Tags
x402
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