x402 Kit

Website: https://www.npmjs.com/package/@scriptmasterlabs/create-x402

The payment layer your agent-facing service is missing. x402 Kit lets AI agents pay for API calls, MCP tool calls, and file downloads per use — no accounts, no API keys, no invoices. One command (npm create @scriptmasterlabs/x402 my-api) scaffolds a paid MCP server, wraps an existing API in a paywall, or creates a paid file store on Express, Hono, Next.js, Cloudflare Workers, or FastAPI. When an agent calls a paid route, the server answers HTTP 402 with a price; the agent signs a USDC payment on Base and retries; the payment settles directly to the seller's own wallet, and a call that fails is never charged. Built for agent builders: every project includes an AGENTS.md so Claude Code or Cursor can install and wire it, a public receipts page with transaction hashes, a live 'paid calls' badge, and automatic facilitator failover. Default facilitator OMNIGATE (https://mcp-x402.onrender.com) takes a 0.005 USDC fee only as an optional leg — standard payments settle with the fee waived inside a published daily budget (500/day across all payTos, 100/day per payTo, UTC) — and the facilitator is changeable in one line of config. Proven with the stock x402 client on every stack and a real $0.01 USDC settlement on Base through a kit-built app (self-proof — both wallets were the maker's; it verifies the payment path end to end). Free, MIT.