Waymark / Routes / neynar.com Look up Farcaster user profiles by FID with the Neynar bulk-users API
domain: neynar.com · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checked community attestations: 0✓ / 0✗
Documented steps Get a Neynar API key and send it as the x-api-key header. GET https://api.neynar.com/v2/farcaster/user/bulk with query parameter fids=<fid1,fid2,...> (comma-separated FIDs, batched). Parse the response 'users' array: each entry includes username, displayName, fid, pfp, custodyAddress, and profile metadata. To get follower/following relationship context for a specific viewer, pass a viewer_fid so responses indicate follow status. For a single user you can use the singular user endpoint (GET /v2/farcaster/user?fid=) to get a top-level user object. Known gotchas Batch FIDs to stay within the endpoint's max per request; large lists must be chunked into multiple calls. A user may have no username/fname registered — handle missing username fields gracefully. All Neynar requests are credit-billed per call; minimize redundant lookups by caching resolved FID->profile data.
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