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Block Signals · Jun 28, 2026

AI Agents Got Real Payment Rails This Month and No Liability Rulebook

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Coinbase counts more than 160 million autonomous agent payments in a year, and three payment giants just made agent spending easier, with no rule yet for who covers a payment an agent gets wrong.

Coinbase chief executive Brian Armstrong said this month that the company’s x402 payment protocol has handled more than 160 million autonomous transactions in a year. Across the same few weeks, Mastercard opened a payment network built for machines, and AWS wired onchain settlement into the edge of its content delivery service. Software agents can now s…

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