x402
An open payment protocol enabling AI software agents to self-fund HTTP API requests using USDC on the Base network without credit cards.
Open productWhat it does
About x402
x402 is an open payment protocol designed for autonomous AI software agents to pay for HTTP API requests programmatically. When a client agent requests a paid API endpoint, the server returns an HTTP 402 Payment Required response containing pricing and address details in the PAYMENT-REQUIRED header. The client SDK interprets this response, signs the authorization via a wallet, and retries the request automatically. Powered by USDC on the Base layer-2 network, x402 enables low-cost micropayments and agent monetization without credit cards or account registration.
- Availability:
- launched
- Access:
- free
- Format:
- software
- Platform:
- api
- Platform:
- cli
Pricing at launch: The x402 payment protocol is free, with costs incurred only for destination API call fees.
Core capabilities
HTTP 402 Response Handling
Returns an HTTP 402 status code detailing the endpoint price in USDC and destination wallet address within the PAYMENT-REQUIRED header upon receiving a paid API request.
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