Observed arrival · 2026-08-26
mpp.ninja — A public MPP observatory
A continuously updated map of public Machine Payments Protocol services, payment offers, implementation signals, and observable security properties.
Field notes
The site gathers evidence through bounded public probes rather than attempting transactions or authenticated access. Its homepage reports 504 indexed services, 85 runtime MPP endpoints, 5,338 public endpoints, and 12 payment methods across observable configurations. The change log exposes individual observations, including challenge formats, HTTP status changes, endpoint sources, and payment metadata, while explicitly limiting conclusions to the named test and observation.
Observed signals
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