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andresdefi
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farcaster

Build Farcaster Mini Apps, Neynar API integrations, and transaction frames on OP Mainnet.

6|20|Updated Mar 14, 2026
Search Tags:#webhooks#mini apps#neynar#farcaster#social protocol#frames v2#op mainnet
One-click install
npx skills add https://github.com/andresdefi/cryptoskills --skill farcaster-andresdefi
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: farcaster
Source: https://github.com/andresdefi/cryptoskills/tree/main/skills/farcaster
Command: npx skills add https://github.com/andresdefi/cryptoskills --skill farcaster-andresdefi

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? AI agents frequently produce outdated or incorrect Farcaster code — mixing up Frames v1 and v2 APIs, using Unix instead of Farcaster epoch timestamps, hallucinating registry contract addresses, or mishandling webhook signature verification — leading to silent failures and broken Mini Apps. ## Core Features & Use Cases - Frames v2 Mini Apps: Build full-screen interactive apps with the @farcaster/frame-sdk, including manifest setup, meta tags, SDK actions, and wallet-based transaction frames via viem or wagmi. - Neynar API Integration: Fetch users, casts, feeds, and channels, publish casts, and manage signers using the @neynar/nodejs-sdk v3 client with correct Configuration-based setup. - Webhook Handling: Implement HMAC-SHA512 verified Neynar webhook listeners using raw request bodies and timing-safe comparison. - Onchain Registry Access: Interact with IdRegistry, KeyRegistry, and StorageRegistry contracts on OP Mainnet using verified contract addresses and cast commands. - Use Case: A developer asks the agent to build a Farcaster Mini App that lets users mint an NFT — the skill provides the manifest structure, SDK initialization, wallet provider setup, and transaction code, while avoiding the domain-mismatch silent failure. ## Quick Start Use the farcaster skill to create a Mini App with a manifest, frame meta tags, and SDK initialization that displays the current user's profile.

Frequently Asked Questions about farcaster

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build a Farcaster Mini App with Frames v2?▼

Create a manifest at /.well-known/farcaster.json with accountAssociation and frame metadata, add an fc:frame meta tag to your HTML, then initialize @farcaster/frame-sdk and call sdk.actions.ready() after loading the user context.

How do I verify Neynar webhook signatures in Node.js?▼

Compute HMAC-SHA512 over the raw request body using your webhook secret and compare it to the X-Neynar-Signature header with crypto.timingSafeEqual. Use express.raw() on the webhook route so the body is never parsed before verification.

What is the difference between Frames v1 and Frames v2?▼

Frames v1 used static OG images with action buttons and server-side rendering. Frames v2 (Mini Apps) are full-screen interactive web applications loaded in an iframe with SDK access to wallet, user context, and notifications — the APIs are not interchangeable.

Why does my Farcaster Mini App fail to load in Warpcast silently?▼

The domain in the accountAssociation payload must exactly match the FQDN hosting /.well-known/farcaster.json — no protocol prefix, trailing slash, or port. A mismatch causes silent failure with no error surfaced to the developer.

Why are my Farcaster timestamps showing dates in the 1970s?▼

Farcaster uses a custom epoch of January 1, 2021 00:00:00 UTC, not Unix epoch. Convert by adding 1609459200 to the Farcaster timestamp before creating a JavaScript Date.

What is the cast text length limit on Farcaster?▼

Casts are limited to 1024 bytes, not characters. UTF-8 multibyte characters like emoji (4 bytes) and CJK (3 bytes) consume more space, so check Buffer.byteLength(text, 'utf-8') before publishing.

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