X402/REGISTER

Every service in the public x402 catalog, probed every hour.

Spec compliance, hourly probe success rate, latency and price honesty for every domain in the public x402 catalog, measured from our own infrastructure, hourly, since 2026-07-12. We never charge rated parties, and popularity is not an input.

297'119
probes made
1'747
domains watched
1'508
services rated
07-20 20:47 UTC
last probe (UTC)

Findings

90.4%
Most services speak the protocol correctly. Share of live domains answering with spec-valid payment terms, measured every hour.
headline = 24h median · one point = one probe run · gaps = not probed
r = 0.19
Popularity barely predicts quality. Our score against the catalog's 30-day call volume shows only a weak positive rank correlation, far below what a popularity ranking would produce. That's why volume isn't an input.
one dot = one service with traffic · volume log scale
16.9% flap
Reliability is what separates services. Most answer every probe; a long tail is up and down all week. The trace in every row below shows it.
domains with ≥60 probes, full window
#GradeDomain Score Probe trace · Jul 15 → Jul 20 Median 402 Price Calls/30d*
valid 402 (short tick) invalid / no answer (full tick) not probed (backoff or outage) one tick = one hour