# CAD042: x402 Protocol

> Implements the HTTP 402 payment protocol over CVM and CAD29 tokens — APIs can gate access per request with a header-level payment, no OAuth, accounts or invoicing. Micropayments for agents and APIs without the Stripe detour.

**Category:** Convex Architecture Documents  
**Badge:** CAD  
**Page:** https://brittleboye.github.io/awesome-lattice/projects/cads/cad042-x402-protocol/

## Links

- **Homepage:** https://docs.convex.world/docs/cad/042_x402
- **Source:** https://github.com/Convex-Dev/design/tree/main/docs/cad/042_x402

## Tags

`spec` `payments` `x402` `api` `tokens`

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