x402

What Is HTTP 402

x402 Track 01
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A Status Code Created in 1998 β€” Never Used Until Now

HTTP 402 "Payment Required" β€” reserved but with no implementation. Blockchain finally found the answer.

What you will learn in this module

  • β†’Structural limitations of traditional payment systems (cards & banks)
  • β†’How HTTP 402 transforms web payments
  • β†’Key differences between x402 and traditional payment infrastructure
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1998 RFC

The HTTP/1.1 standard reserved code 402 but left it as 'future use'.

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Blockchain Is the Key

Smart contracts and stablecoins finally make true internet-native payments possible.

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The AI Agent Era

AI agents that pay autonomously without human intervention need x402 as essential infrastructure.