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Farcaster Profile Lookup by Ethereum Address
x402
Farcaster Profile Lookup by Ethereum Address is a paid API for AI agents from agent402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Reverse-lookups an Ethereum address to its associated Farcaster account profile via verified address linkage
Price / call$0.002
Success—
StatusUnknown
How this service works
Reverse-lookup an Ethereum address to its Farcaster account (via verified address). Returns FID, username, display name, bio, follower/following counts, and Warpcast URL, or found=false if the address has not verified on Farcaster. Use to label wallet activity with the owner's Farcaster identity when ENS is missing.
Output
Returns a JSON object with found=true and profile fields (FID, username, display name, bio, follower count, following count, Warpcast URL) if the address has a verified Farcaster account, or found=false if no Farcaster account is linked to that address.
Example use cases
Example prompt
“Can you tell me who this Ethereum address belongs to on Farcaster — 0x742d35Cc6634C0532925a3b8D4C9C6B9a2b4F1e8? I want their username, bio, and follower count.”
Technical details
Endpoint
POSThttps://agent402.tools/api/farcaster-by-addressWhen to prefer
Use this endpoint when you have an Ethereum wallet address and need to identify the corresponding Farcaster social identity — for example, to label on-chain actors with their social profiles, enrich NFT holder lists, or attribute blockchain transactions to social accounts. Prefer this over forward-lookup (username→address) when the address is your starting point.
Side effects
- Address not verified on Farcaster returns found=false rather than an error
- Malformed or non-0x-prefixed address may return a validation error
- Address verified on Farcaster under a deactivated account may return incomplete profile data
- Network timeout if Farcaster hub is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | Ethereum address (0x-prefixed 40-hex). |
Output
Schema · Response
{
"type": "json",
"example": {
"bio": "Working on Farcaster.",
"fid": 3,
"found": true,
"pfpUrl": "https://...",
"source": "neynar",
"address": "0xd7029bdea1c17493893aafe29aad69ef892b8ff2",
"username": "dwr",
"venueUrl": "https://warpcast.com/dwr",
"displayName": "Dan Romero",
"followerCount": 500000,
"followingCount": 1000
}
}Tags
x402
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