# Pay-per-call protocols compared head to head

> 14 head-to-head comparisons of pay-per-call payment protocols for AI agents, grouped by the job each pair shares, with benchmark scores for both sides.

- Canonical: https://www.anchorterminal.com/compare/pay-per-call/
- Markdown: https://www.anchorterminal.com/compare/pay-per-call/index.md (~650 tokens)
- Slim: https://www.anchorterminal.com/compare/pay-per-call/index.min.md (~580 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/pay-per-call/index.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

- Ranked table: https://www.anchorterminal.com/categories/pay-per-call.md

## Agent payment protocols

- [ACK-Pay (Agent Commerce Kit) vs Agentic Commerce Protocol (ACP)](https://www.anchorterminal.com/compare/ack-pay-vs-acp.md): D 53.6 vs C 60.9
- [ACK-Pay (Agent Commerce Kit) vs Agent Payments Protocol (AP2)](https://www.anchorterminal.com/compare/ack-pay-vs-ap2.md): D 53.6 vs C 55.3
- [ACK-Pay (Agent Commerce Kit) vs L402](https://www.anchorterminal.com/compare/ack-pay-vs-l402.md): D 53.6 vs C 60.5
- [ACK-Pay (Agent Commerce Kit) vs Machine Payments Protocol (MPP)](https://www.anchorterminal.com/compare/ack-pay-vs-mpp.md): D 53.6 vs A 81.1
- [ACK-Pay (Agent Commerce Kit) vs x402](https://www.anchorterminal.com/compare/ack-pay-vs-x402.md): D 53.6 vs A 79.7
- [Agentic Commerce Protocol (ACP) vs L402](https://www.anchorterminal.com/compare/acp-vs-l402.md): C 60.9 vs C 60.5
- [Agentic Commerce Protocol (ACP) vs Machine Payments Protocol (MPP)](https://www.anchorterminal.com/compare/acp-vs-mpp.md): C 60.9 vs A 81.1
- [Agentic Commerce Protocol (ACP) vs x402](https://www.anchorterminal.com/compare/acp-vs-x402.md): C 60.9 vs A 79.7
- [Agent Payments Protocol (AP2) vs L402](https://www.anchorterminal.com/compare/ap2-vs-l402.md): C 55.3 vs C 60.5
- [Agent Payments Protocol (AP2) vs Machine Payments Protocol (MPP)](https://www.anchorterminal.com/compare/ap2-vs-mpp.md): C 55.3 vs A 81.1
- [Agent Payments Protocol (AP2) vs x402](https://www.anchorterminal.com/compare/ap2-vs-x402.md): C 55.3 vs A 79.7
- [L402 vs Machine Payments Protocol (MPP)](https://www.anchorterminal.com/compare/l402-vs-mpp.md): C 60.5 vs A 81.1
- [L402 vs x402](https://www.anchorterminal.com/compare/l402-vs-x402.md): C 60.5 vs A 79.7
- [Machine Payments Protocol (MPP) vs x402](https://www.anchorterminal.com/compare/mpp-vs-x402.md): A 81.1 vs A 79.7