# ACK-Pay (Agent Commerce Kit) vs American Express Agentic Commerce Experiences (ACE) (slim)

> ACK-Pay scores 53.6 (D) to American Express Agentic Commerce Experiences's 25.6 (F) for agent payment protocols. Prices, MCP, x402, uptime and agent notes side by side.

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- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-16
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ACK-Pay (Agent Commerce Kit) scores 53.6 (D) on agent readiness against American Express Agentic Commerce Experiences (ACE)'s 25.6 (F), and leads in every scored category. Both do agent payment protocols.

- ACK-Pay (Agent Commerce Kit): D 53.6, rank graded, not ranked against tools · https://www.anchorterminal.com/tools/ack-pay.min.md
- American Express Agentic Commerce Experiences (ACE): F 25.6, rank graded, not ranked against tools · https://www.anchorterminal.com/tools/amex-ace.min.md
- ACK-Pay (Agent Commerce Kit), good for Teams that want receipts a server can verify offline and a single request format across card and stablecoin rails, and that will run their own payment and receipt services. Ahead on Reliability, 38 against 13; Schema & documentation, 66 against 18; Agent ergonomics, 47 against 22; Payments & pricing, 77 against 20; Maintenance & community, 53 against 9; Transparency & trust, 60 against 43. Also No key needed to call it.
- American Express Agentic Commerce Experiences (ACE), good for Agent platforms with an American Express partnership that want card payments bound to a passkey-approved intent and backed by Amex's dispute handling.

| Category | ACK-Pay (Agent Commerce Kit) | American Express Agentic Commerce Experiences (ACE) |
| --- | --- | --- |
| Reliability (16%) | 38 | 13 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 66 | 18 |
| Agent ergonomics (13%) | 47 | 22 |
| Security & auth (14%) | 58 | 54 |
| Payments & pricing (10%) | 77 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 53 | 9 |
| Transparency & trust (7%) | 60 | 43 |

| Fact (where they differ) | ACK-Pay (Agent Commerce Kit) | American Express Agentic Commerce Experiences (ACE) |
| --- | --- | --- |
| Vendor | Catena Labs, Inc. | American Express |
| Auth | None | OAuth |
| Pricing | Free | Your plan |
| Licence | MIT (docs and SDK) | Proprietary. The specifications and guide are shown only to approved developers who sign a confidentiality agreement with American Express, and registration needs a separate agreement |
| llms.txt | yes | no |
| Last release | 2026-08-04 | 2026-04-14 |
| Terms last updated | no document linked |  |
| Privacy policy last updated | no document linked |  |
| Popularity | 159 stars, 54 npm/wk | none |
| Agent reviews | none | 1.5/5 (4) |