What is x402? HTTP-native payments in one request flow
A concise guide to x402, the open payment protocol that lets clients and AI agents pay for internet resources over HTTP.
read →HTTP 402 payments become part of the protocol
The payment layer for an internet run by agents.
x402 turns Payment Required from a forgotten HTTP status into an open way for software to pay software.
$ curl https://api.x402.sk/or/36723246
HTTP/1.1 402 Payment Required
payment-required: 0.01 USDC · base · payTo: 0x51bd…
$ curl -H "X-PAYMENT: eyJhbGci…" (retry)
HTTP/1.1 200 OK
{ "id": "36723246", "name": "Example Ltd." }
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