x402lint
x402 Linter
In the AI payments ecosystem
x402lint is an early-stage TypeScript project in the AI payments / x402 ecosystem, focused on agents, lint, payments, x402. It currently has 3 GitHub stars and 2 forks, and sits alongside related tools like pinion-os, mainnet-x402-facilitator, protocol-commercial, pinion-os, agent-kit, dexter-x402-sdk.
x402lint
Validate x402 payment configurations. Checks structure, address formats, network identifiers, and more — with zero dependencies.
x402lint.com — validate in the browser
npm — npm i x402lint
What it does
- Validates v1 and v2 x402 payment configs
- Verifies EVM addresses (EIP-55 checksums) and Solana addresses (base58)
- Checks CAIP-2 network identifiers against a known registry
- Extracts configs from HTTP 402 responses (body or
PAYMENT-REQUIREDheader) - Normalizes any supported format to canonical v2
- Returns structured errors and warnings with fix suggestions
Claude Skill
Teach Claude Code to create and validate x402 configs:
npx skills add https://github.com/rawgroundbeef/x402lint --skill x402lint
Monorepo structure
packages/
x402lint/ SDK — published to npm as x402lint
x402check/ Thin alias — re-exports x402lint
config/ Shared TypeScript config
apps/
website/ x402lint.com — hosted on Cloudflare Pages
worker/ CORS proxy — Cloudflare Worker
Development
pnpm install
pnpm build:sdk
pnpm test:sdk
Links
License
MIT
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