x402
Open standard that lets APIs charge per request in stablecoins
Launched 18 months agox402.org
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About x402
x402 is an open protocol for internet-native payments, initially developed by Coinbase. It lets any HTTP API charge per request without issuing API keys or storing credit cards. Buyers, whether humans or AI agents, keep funds in their own wallet and discover compatible endpoints. They pay a small amount in USDC or other tokens automatically when they call an API. The protocol revives the HTTP 402 Payment Required status code, and any API or MCP server can be made accessible to agents without manual setup.
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