Payment protocols

MPP Tempo Testnet

The production MPP Tempo flow on a test network. Start here when validating MPP-capable clients or agent frameworks.

URL segment
mpp-tempo-testnet
Payment header
Authorization
Availability
Free and paid plans
Best for
Testing MPP credential handling and token payments before production.

Endpoint URL

https://agent-proxy.alchemy.com/v1/mpp-tempo-testnet/{projectId}/{endpointSlug}/{path}

Setup

  1. Enable MPP Tempo Testnet in the dashboard.
  2. Enter the testnet recipient wallet address.
  3. Enter the test token contract address.
  4. Set a decimal price per request.
  5. Call the generated URL and confirm the 402 challenge is returned.

Request flow

  1. The client calls the mpp-tempo-testnet URL.
  2. AgentPay returns a 402 MPP challenge.
  3. The client retries with a payment credential in the Authorization header.
  4. AgentPay verifies the credential on the test network and forwards the request.

Notes

  • Available on the Free plan for onboarding and validation.
  • Use separate test recipient addresses and test tokens.
  • Move to MPP Tempo once the client reliably handles the challenge, payment, retry, and error cases.