Originally published on AI Tech Connect.
What you need to know For thirty years, the HTTP status code 402 has sat in the specification marked "Payment Required" and reserved for future use. That future has arrived, and it arrived because of AI agents. When software starts acting on a user's behalf — booking, buying, subscribing, calling paid APIs without a person at the keyboard for each step — the entire assumption behind online payment breaks. Card checkout expects a human to read a form, tick a box and confirm. An agent needs something machine-native: a way to be quoted a price, attach proof that it may pay, and settle the money, all in code. As of 2026, four protocols compete to be that machine-native layer. x402, from Coinbase, revives the 402 status code to settle stablecoin payments over plain HTTP. AP2, the Agent…
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