MPP — Machine Payments Protocol

Stripe's machine-to-machine payment protocol over HTTP 402.

Stripe's machine-to-machine payment protocol over HTTP 402. The agent declares its accepted payment rails (card via Stripe / Visa SPTs, stablecoins via Tempo, Lightning), the spending limit it's authorised for, and the facilitator endpoint it talks to.

Stripe-issued payment intent + agent verification handshake: AstraSync sits between the agent and Stripe.

You declare: merchant ID, facilitator URL, payment methods, currency, spending limit.

PDLSS pre-fill: spending limit flows to autonomous and hard limits; facilitator domain + merchant:<id> added to counterparties; currency mirrored to PDLSS.

{
  "protocols": ["a2a", "mpp"],
  "mpp": {
    "merchantId": "merchant_abc123",
    "facilitatorUrl": "https://mpp.example.com",
    "paymentMethods": ["card", "stablecoin"],
    "currency": "USD",
    "spendingLimit": 500
  }
}