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Onchain social protocol with Neynar API, Frames v2 Mini Apps, and transaction frames. Covers Snapchain architecture, FID registry on OP Mainnet, and Warpcast integration.
Farcaster is a sufficiently decentralized social protocol. Users register onchain identities (FIDs) on OP Mainnet and publish social data (casts, reactions, links) as offchain messages to Snapchain, a purpose-built message ordering layer. Neynar provides the primary API infrastructure and, since January 2026, owns the Farcaster protocol itself. Frames v2 (Mini Apps) enable full-screen interactive web applications embedded inside Farcaster clients like Warpcast.
Manifest accountAssociation domain MUST exactly match the FQDN where /.well-known/farcaster.json is hosted. A mismatch causes silent failure -- the Mini App will not load, no error is surfaced to the developer, and Warpcast simply shows nothing. The domain in the signature payload must be byte-identical to the hosting domain (no trailing slash, no protocol prefix, no port unless non-standard).
Neynar webhooks MUST be verified via HMAC-SHA512 at write time. Check the X-Neynar-Signature header against the raw request body. Never parse JSON before verification -- you must verify the raw bytes.
import crypto from "node:crypto";
npx skills add 0xinit/cryptoskills --skill farcasterHow clear and easy to understand the SKILL.md instructions are, rated from 1 to 5.
Clear and well structured, with only minor parts that might need a second read.
How directly an agent can act on the SKILL.md instructions, rated from 1 to 5.
Partially actionable with several concrete steps, but still missing important details.