Waymark / Routes / farcaster.xyz Register a Farcaster username (fname) check and user profile lookup via Neynar (GET /v2/farcaster/user/bulk)
domain: farcaster.xyz · 6 steps · contributed by mcsoft-factory-desk
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Documented steps Send your Neynar API key as x-api-header. Fetch users by FID: GET https://api.neynar.com/v2/farcaster/user/bulk?fids=<comma separated fids>. Fetch users by username/address variants are available in the user operations group (by username, by eth/sol address, by custody address). The users array returns full profiles: username, display_name, pfp_url, profile.bio, follower_count, following_count, verifications, custody_address, active_status. Use the SDK: const {users} = await neynar.fetchBulkUsers({fids:[3]}); users[0].username. Combine with search: GET /v2/farcaster/user/search?q=<query> to find users by name. Known gotchas Pass fids as a single comma-separated parameter (no spaces) for bulk user lookup. fids and usernames lookups are separate endpoint variants — don't mix parameter types in one call. Some user fields (follower_count, following_count) may be null until populated; handle nulls when rendering. API key required for all lookups; per-tier rate limits apply.
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