{"uid":"cap_n9qh29Gz9voE7HUPgf0bK","slug":"farcaster-profile-lookup-by-username-or-fid-90d5b7f6","name":"Farcaster Profile Lookup by Username or FID","description":"Lookup a Farcaster profile by username or FID. Returns FID, username, display name, bio, profile picture URL, follower/following counts, and the canonical Warpcast URL. Use to label cast authors, validate a Farcaster handle, or fetch a profile for display.","url":"https://agent402.tools/api/farcaster-profile","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"fid":{"type":"number","description":"Farcaster ID (integer; one of fid/username required)."},"username":{"type":"string","description":"Farcaster handle, with or without leading @ (one of fid/username required)."}}},"responseSchema":{"type":"json","example":{"bio":"Working on Farcaster.","fid":3,"pfpUrl":"https://...","source":"neynar","username":"dwr","venueUrl":"https://warpcast.com/dwr","powerBadge":true,"displayName":"Dan Romero","followerCount":500000,"followingCount":1000,"activeOnFcNetwork":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_JesbhUDlCP9buySDn3H0k","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up a Farcaster user profile by username or numeric FID, returning identity metadata including bio, follower counts, and Warpcast URL.","exampleAgentPrompt":"Can you pull up the Farcaster profile for the username 'dwr.eth' — I want to see their display name, bio, follower count, and profile picture?","exampleUseCases":null,"resultDescription":"Returns a structured object containing the user's FID, username, display name, bio text, profile picture URL, follower count, following count, and the canonical Warpcast profile URL.","failureModes":["Username or FID not found — returns error indicating no matching profile","Neither fid nor username provided — returns validation error requiring at least one identifier","Invalid FID type (non-integer) — returns schema validation error","Network or upstream Farcaster hub unavailability — returns timeout or 5xx error","Rate limiting — returns 429 if call quota exceeded"],"whenToPreferThis":"Use this endpoint when you need to resolve a Farcaster username or FID to a full profile record, enrich cast or event data with author identity, validate whether a Farcaster handle exists, or display human-readable profile info from a known identifier. Prefer this over generic social lookup tools when specifically working within the Farcaster/Warpcast ecosystem.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:55:09.520Z","isFirstParty":false}