CoinDesk reported this weekend that stablecoins are pulling ahead as the payment method for machine-to-machine commerce. @coinbase counts more than 165 million payments worth a combined $50 million through x402, roughly 99% settling in $USDC by their AI product lead's estimate, and their April count showed over 480,000 active agents. that averages out to about 30 cents per payment. half a million agents making 30-cent payments is a volume no human review queue survives, so the controls have to run at machine speed too. ampersend checks every x402 payment an agent makes against its budget and policy before it settles, blocks or escalates anything outside them, and writes the record as the payment happens. the rail question is settling, and the governance question is where teams now differentiate.