# Machine Payments Protocol (MPP)

Machine Payments Protocol (MPP) is an entry in this index of agent wallets and payment rails; every fact links back to the vendor's docs or the protocol spec.

Open protocol that standardizes HTTP 402 for machine-to-machine payments with challenges, credentials and receipts. Co-authored by Tempo and Stripe and submitted to the IETF.

## Details

- Address: Online, Global
- Website: [mpp.dev](<https://mpp.dev>)
- Organization: Tempo Labs and Stripe
- Status: Beta
- Rail: Mixed
- Chains: Tempo
- Protocols: MPP
- Per-call minimum: Not set by the protocol
- Spend caps: None published
- Human approval: None
- KYC needed: Varies
- Custody: not applicable
- MCP support: Official
- Fees: Not set by the protocol
- Licence: MIT OR Apache-2.0
- Source: [github.com/tempoxyz/mpp-specs](<https://github.com/tempoxyz/mpp-specs>)

## Questions

### Where is Machine Payments Protocol (MPP)?

Machine Payments Protocol (MPP) is at Online, Global.

### How do I contact Machine Payments Protocol (MPP)?

To contact Machine Payments Protocol (MPP), visit https://mpp.dev.

## Source

From [Open protocol specifications](https://github.com/x402-foundation/x402), license Apache-2.0 (x402, AP2 and ACP spec repos) and MIT OR Apache-2.0 (MPP specs), checked 2026-10-21.

Last updated October 21, 2026.

## Links

- This agent wallet on the [web page](<https://agentwalletindex.fyi/global/online/machine-payments-protocol-mpp>)
- [Payment protocols in Online](<https://agentwalletindex.fyi/global/online/category/payment-protocols.md>)
- [More agent wallets in Online](<https://agentwalletindex.fyi/global/online.md>)

> **Check before you fund.** Features, fees and protocol support change. Follow the cited source on each row before you let an agent hold or spend money.