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Add x402 Surface Check #241

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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -76,6 +76,7 @@ x402 is an emerging open standard from the Coinbase ecosystem focused on safer,
- [x402-saas (Hosted Onboarding Proxy on Base)](https://x402-saas.surge.sh) — Sign in with a wallet, point at any backend URL, get a paywalled proxy URL in ~60s. Multi-tenant data plane with SIWE auth and slug routing. 1% of routed USDC volume; MIT-licensed self-host alternative at [x402-kit](https://github.com/kite-builds-erik/x402-kit).
- [x402-kit (TypeScript)](https://github.com/kite-builds-erik/x402-kit) — MIT-licensed Express middleware + slug-routed multi-tenant data plane that powers [x402-saas](https://x402-saas.surge.sh). 38 tests, real x402.rs facilitator wired in.
- [x402-proxy](https://github.com/cascade-protocol/x402-proxy) - `curl` for x402 paid APIs. CLI and library that auto-pays HTTP 402 responses with USDC on Base and Solana, with MCP stdio proxy for AI agents. `npx x402-proxy`.
- [x402 Surface Check](https://github.com/TateLyman/x402-surface-check) - No-payment CLI for reviewing x402 manifests, OpenAPI specs, HTTP 402 challenges, browser CORS/payment-header behavior, cache policy, resource binding, and price/rail drift before launch. ([npm](https://www.npmjs.com/package/x402-surface-check))
- [x402-agent-pay (Agent payments with MCP, spending controls, discovery & receipts)](https://github.com/Omnivalent/x402-agent-pay)
- [agent-wallet-sdk (NPM)](https://www.npmjs.com/package/agentwallet-sdk) - Non-custodial multi-chain wallet SDK for AI agents with native x402 payment support, CCTP cross-chain transfers, and CowSwap solver integration.
- [ATXP – Agent Identity & Payment Infrastructure](https://github.com/atxp-dev/atxp) – One command registers an AI agent with a USDC wallet on Base, `@atxp.email` inbox, and 100+ x402-paid MCP tools (web search, image gen, LLM). The agent is both an x402 payer and can receive USDC payments.
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