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Monetize your API with x402

x402 lets you monetize HTTP APIs and content with on-chain payments, while keeping your existing server stack. Benefits: ✅ Merchants don’t pay network fees.
✅ Customers don’t pay network fees.
✅ Payment settles in < 1 second.
✅ Universal compatibility — if it speaks HTTP, it speaks x402.

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Architecture at a glance

x402 sequence diagram
  • Client: Calls your protected resource and submits payments.
  • Server (merchant): Advertises payment requirements, verifies payments, fulfills requests, and settles payments.
  • Facilitator: Verifies and/or settles payments on your behalf via standard endpoints.
  • Blockchain: Where payments are executed and confirmed.

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Getting started

Select one of the quickstart examples, or read the reference for more details.

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Facilitator URL

The PayAI facilitator URL is https://facilitator.payai.network.

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x402 reference

For a deeper dive into message shapes, headers, verification and settlement responses, see the x402 Reference.

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