@chipi-stack/x402

x402 Payment Protocol for Starknet — AI agent payments, micropayments, and HTTP-native pay-per-use middleware.

Install

npm install @chipi-stack/x402

What it does

The x402 package implements the HTTP 402 Payment Required protocol for Starknet, enabling:

• Facilitator — validates and settles payments on-chain
• Middleware — Express/Next.js middleware that gates endpoints behind payments
• Client — handles payment negotiation and token attachment

Payments are gasless (via paymaster), non-custodial, and settle in USDC on Starknet mainnet.

What you can ship

• Paywalled APIs for AI agents — charge per-call with autonomous payment negotiation
• Micropayments for content/data — gate articles, datasets, or media behind sub-dollar payments
• Pay-per-call API monetization — monetize any HTTP endpoint without subscriptions
• Machine-to-machine autonomous payments — let agents pay agents without human intervention

Have an idea? Tell us what you want to build

Documentation

Full docs and integration guide: docs.chipipay.com

License

MIT — Chipi Pay