Causeway Services
What is x402? HTTP 402 Payment Required for AI agents and APIs neighborhood
The current page first, followed by its outgoing and incoming relations.
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What is x402? HTTP 402 Payment Required for AI agents and APIs
x402 is an open protocol that lets software pay for a web request in USDC by answering HTTP 402 Payment Required. How it works, who runs it, who uses it.
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Causeway Services: x402 guides, a market where software pays, books, news and games
Causeway Services runs an x402 market of 130 offers payable in USDC over HTTP 402, and publishes guides, books, Koios News and games. Start here.