Miamix402 bills agents per web request.
Coinbase engineer Erik Reppel told Consensus Miami that AI agents bypass ad rendering, collapsing the revenue model funding most web content.
Reppel’s x402 encodes payment in HTTP’s unused 402 status code, settling in stablecoins.
Sources: CoinDesk
THE FORGOTTEN STATUS CODE
HTTP was specified in 1989 with a status code reserved for paid content: 402 Payment Required. It was never implemented. The web's founders expected micropayments would emerge; instead, advertising filled the vacuum and 402 sat unused for thirty-five years.
WHY MICROPAYMENTS FAILED
Every attempt at web micropayments — Millicent (1995), DigiCash, Flooz, Beenz — collapsed on the same wall: card networks charge ~30¢ minimum per transaction, making sub-dollar payments structurally unprofitable. Stablecoins on L2 rails settle for fractions of a cent, removing the floor that killed every prior attempt.
THE GRAND BARGAIN
The modern web runs on an implicit deal: publishers serve content free, users tolerate ads and tracking, advertisers pay publishers via Google and Meta. Roughly $700bn flows through this loop annually. AI agents break it by reading the content and skipping the ads — the consideration the publisher was paid for never gets delivered.
WHY STABLECOINS, NOT CARDS
A stablecoin is a token pegged 1:1 to the dollar, redeemable against reserves of Treasuries and bank deposits. Settlement is final in seconds, fees are denominated in cents on L2s, and there is no chargeback layer — exactly the properties a machine-to-machine payment needs and exactly what card networks cannot offer.
THE AGENT ECONOMICS PROBLEM
An AI agent answering a question may hit fifty pages to compose one reply. At card-network economics that is impossible. At x402 economics — say a tenth of a cent per fetch — it is a rounding error for the agent and a real revenue stream for the publisher. The unit economics flip from impossible to obvious.
THE PRECEDENT THAT WORKED
The one micropayment system that ever scaled was the iTunes Store: 99¢ songs, paid via card, only viable because Apple aggregated thousands of transactions before settling with the network. x402 inverts that — instead of aggregating to fit the rails, it changes the rails so each request can settle on its own.