MPP (Machine Payments Protocol) Alternatives
Open HTTP 402 payment protocol from Stripe and Tempo, extensible to stablecoins, cards and Lightning
MPP (Machine Payments Protocol) lets a buyer pay a seller per request over HTTP.
Explore 11 alternatives to MPP (Machine Payments Protocol) across 1 category. Updated November 2026.
Top MPP (Machine Payments Protocol) alternatives at a glance
- Openspender. Payment router for AI agents: pay per request across LLM APIs and tools from a self-custodial wallet
- Crossmint. Agent wallets, virtual cards with spend limits and a checkout API for AI agents paying in fiat or stablecoins
- x402. Open protocol for paying per request over HTTP 402, used by AI agents to pay APIs in stablecoins
- looot. One key and one prepaid balance for an AI agent to call 90+ data providers per call, priced before each run
- Catena. Governance and banking for AI agents: per-agent identities, spending policies, approvals and an audit trail
Compare MPP (Machine Payments Protocol) with its alternatives
| Product | Pricing Model | Free Tier | Open Source | Hosting | HQ |
|---|---|---|---|---|---|
| MPP (Machine Payments Protocol) | Free | ✓ | ✓ APACHE-2.0 | — | — |
| Openspender | Pay-per-use | ✓ | — | Cloud | — |
| Crossmint | Pay-per-use | ✓ | — | Cloud | — |
| x402 | Free | ✓ | ✓ APACHE-2.0 | — | — |
| looot | — | — | — | Cloud | — |
| Catena | — | — | — | Cloud | ๐บ๐ธ United States |
| Locus | Pay-per-use | — | — | Cloud | ๐บ๐ธ United States |
| Natural | Freemium | ✓ | — | Cloud | — |
| Nevermined | Freemium | ✓ | — | Cloud | ๐จ๐ญ Switzerland |
| Anyway | Pay-per-use | — | — | Cloud | ๐บ๐ธ United States |
| Skyfire | — | — | — | Cloud | — |
| Sapiom | — | — | — | Cloud | ๐บ๐ธ United States |
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