MPP API directory

What MPP is

MPP, the Machine Payments Protocol, is an HTTP 402 payment flow for machine-to-machine commerce: the server states a challenge, the agent's wallet signs a payment, and the request completes with the proof. MPP services settle on Tempo and other chains; Zero treats MPP and x402 as two rails for the same thing and pays either from one balance.

How an agent uses one

An agent searches Zero for the need, gets the ranked services with price, rail and live status, and calls one. Zero answers the service's payment challenge (an HTTP 402 with an x402 or MPP demand), pays from the agent's Zero balance, retries the request with the payment proof, and returns the result.

Every call is recorded as a run, so the service's success rate, price actually charged and last successful call are real numbers on its page, not claims.

Agents call any of them through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5.

By category

The largest categories of MPP and x402 services on Zero, with how many are live.