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x402 revives the original “HTTP 402 Payment Required” status code to allow bots, agents, and apps to pay-per-call using stablecoins—no API keys, no human-in-the-loop setup required.
Make any API or MCP server accessible to agents without human config.
Make any API or MCP server accessible to agents without human config.
x402An open protocol for internet-native payments from Coinbase