Circle
./PayUSDC issuance, programmable wallets, and Circle Payments for agent-to-agent settlement
MCPOpenAPIllms.txtx402
$ protocol support
$ payment protocols
x402x402Coinbase, x402 Foundation · settlement
HTTP 402 standard for per-request stablecoin payments between an agent and an API
$ agent access
authAPI Key
onboardingFull — agent can self-onboard
tosExplicitly welcomes bots
webhooksYes
free tierYes
billingper-transaction
#usdc#stablecoin#wallets#settlement
https://www.circle.com
// last verified 8/26/2026
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