# climate.stripe.dev

> Contribute to permanent carbon removal via Stripe Climate. Pay with USDC using MPP or x402.

## Endpoints

- [POST /api/contribute](https://climate.stripe.dev/api/contribute): Contribute to carbon removal. Amount in cents (1-10000).

## Payment protocols

This service requires payment via one of the following protocols:

- [MPP](https://mpp.dev): Pay with USDC on Tempo (eip155:42431). Respond to `WWW-Authenticate: Payment` challenge with `Authorization: Payment proof=<token>`.
- [x402](https://x402.org): Pay with USDC on Base (eip155:8453). Respond to `PAYMENT-REQUIRED` header with `payment-signature` header.

## How to contribute

1. Send `POST /api/contribute` with `{"amount": <cents>}` where amount is 1-10000.
2. Receive a `402` response with payment challenges for MPP and x402.
3. Create a payment using either protocol for the requested amount.
4. Retry the same request with the payment credential header attached.
5. Receive a `200` response with `contribution_id` and `impact` description.

## Discovery

- [OpenAPI spec](https://climate.stripe.dev/openapi.json): Machine-readable API definition with payment metadata.
- [llms.txt](https://climate.stripe.dev/llms.txt): LLM-friendly documentation.