Receive real-time Farcaster events with Neynar webhooks (cast.created, follow.created, etc.)
domain: neynar.com · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Build a backend HTTP route that accepts POST with Content-Type application/json and returns success quickly.
Create a webhook on the Neynar developer portal (or programmatically via client.publishWebhook({name, url, subscription: {...}})) and register your endpoint URL.
Choose event subscriptions: cast.created (by author, per-channel, or mentions), cast.deleted, user.updated, follow.created/follow.deleted, reaction.created/deleted, etc. — each webhook supports several event types.
For channel/author subscriptions provide the required filter params (channel id, fid, mention regex) so events are scoped correctly.
When an event fires, Neynar POSTs the event payload to your registered URL; parse and act on it in your handler.
Known gotchas
Webhooks do not work for frontend-only apps — you need a server endpoint.
Free tunnels (ngrok, localtunnel) are often rate-limited by providers; use them for dev but host the endpoint properly for production.
Return a 2xx from your handler quickly or Neynar may retry/timeout; validate webhook payloads before acting.
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