x402 or AP2 — which one does an agent need?
x402 and Agent Payments Protocol (AP2) on the same axes: Sato Score 87 (High) vs 72 (High). No winner is declared, as of 2026-10-28.
- Answered from live data2026-10-28
Every row is read off the live record for each side — nothing is typed. What this cannot settle: Both are early, and neither listing's adoption figures are independently verified — self-reported volume is never presented as fact on this site. AP2's higher star count reflects a specification repository from a large vendor, not deployed usage; x402's lower one sits under a protocol with more shipped implementations in this directory. Star counts are the least meaningful row in the table, which is exactly why they are not the first one.
| Axis | x402 | Agent Payments Protocol (AP2) |
|---|---|---|
| Category | Payment Rail | Payment Rail |
| Chains | Base, Ethereum, Solana, Bitcoin, Multichain | Ethereum, Base, Multichain |
| Source availability | Yes | Yes |
| Sato Score | 87 (High) | 72 (High) |
| Latest commit or release | 2026-10-22 | 2026-06-17 |
| Liveness | Active · 2026-10-22 | Quiet · 2026-06-17 |
| What was checked | install reproduced 2026-10-26 | reviewed |
| Verification status | Unverified | Verified |
How this was answeredShowHide
Both records read live and laid on the same axes by lib/comparisons.ts. Every cell is derived; the caveat names what the data cannot settle.
Every answer on this page is produced by one named function over Sato Hub's live records on the date shown. Nothing is typed by hand, no figure is carried over from a previous day, and an answer with nothing behind it says unknown rather than zero. The Sato Score measures how open, active and verifiable a project is — it is not a safety, quality or returns grade.
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Sato Hub. "x402 or AP2 — which one does an agent need?." Sato Hub, updated 2026-10-28, accessed 2026-10-28. https://satohub.ai/answers/x402-or-ap2Data last refreshed 2026-10-28; this page is rebuilt daily. Citations carry the date so a reader can tell which snapshot a claim came from. Catalog data is licensed CC-BY-4.0 and the machine-readable copy is linked in the page's Dataset metadata.