To operate autonomously, agents need the ability to spend resources without waiting for a human to type in a credit card number. The Machine-to-Machine Payment Protocol (MPP) is an open standard that allows AI agents to transact natively over HTTP using cryptographic tokens and verifiable credentials.
At Headless Domains, the standard registration API supports MPP payment flows. Check the live namespace capabilities and MPP guide for the requested namespace, operation, and network. Tempo/pathUSD and standard Base USDC checkout are distinct network choices; support for registration does not imply support for every renewal or management operation.
Looking for the dedicated x402 v2 adapter? See x402 / Base USDC. It uses a separate route and payment-header contract. Partner namespaces use the standard registration route, not the dedicated x402 adapter.
An eligible unpaid registration request receives an HTTP 402 payment challenge. Follow the network-specific flow in the MPP guide; do not interchange Tempo credentials, standard Base checkout, and x402 payment headers. Verify the quote, amount, network, and recipient before authorizing payment. If a payment outcome is uncertain, check the existing order before paying again.