Published 2026-09-07. Full catalogue scan of 2026-09-06: 15,686 x402 resources.
The catalogue grew to 15,686 resources, up from 14,215 a week ago. Of those, 11,957 are payable (76.2 percent). The cannot-be-paid share is 3,729 resources, or 23.8 percent, roughly 1 in 4.2, up from 18.1 percent last week. Both figures are on the same corrected basis we published on August 31, so this is an apples to apples comparison, not an artefact of the label fix from last week.
The headline is not the payable percentage, it is how fast the catalogue turns over. Of last week's 14,215 resources, 2,544 (17.9 percent) are gone from this week's scan, roughly 2.6 percent per day, the same steady rate we have measured for a month. In the same week 4,015 resources appeared that were not there before. Among the resources present in both scans, 72 that were genuinely payable last Sunday are not payable now. Recovery counts in the other direction are inflated by the basis change this week and we will report them cleanly next week. The takeaway holds: a directory that indexes once and never refreshes is serving roughly a fifth of its catalogue as stale within a week.
The number of independent parties probing the x402 catalogue jumped this week. Six new watchers appeared for the first time in our logs: a census and conformance family operated from councilof.ai (first seen September 4), 10x402-monitor (September 3), MIDAX402-Verifier (September 7), 402scope-discovery (September 7), agentprobe (September 7), and a user agent identifying itself as our own composed-verifier (September 2). On our own payability endpoint alone we now see roughly 633 probes per day (4,437 over seven days) from 397 distinct addresses and 100 distinct user agents. The ecosystem is measuring itself, in parallel, at scale.
September 5 was the busiest settlement day we have recorded: 34 paid calls settled on chain to our endpoints in a single UTC day, with our own operational self-payments excluded. Most of that was one production integrator whose launch-day peak reached 32 paid screening calls in the day. We do not name customers; the point is that real paid usage, not just probes, is arriving.
We also ran the first measurement of x401, the emerging Proof and Notarize layer proposed on top of x402. Across all 15,686 resources, zero currently emit an x401 header of either specification generation. Adoption starts at zero, and we publish that now so the first real emitters have a fixed line to be measured against: x402.nsgoods.org/proof/x401-adoption.html.
The catalogue is scanned in full once a week, Sunday at 05:02 UTC. Each resource gets a per-rail verdict (payable or not, per settlement network, with the failure reason) without paying the endpoint. Payable percentages this week and last are stated on the corrected basis published on August 31, so the two weeks compare directly. Payment counts come from on-chain USDC transfers to our receiving address, with our own operational self-payments excluded. Machine-readable headline numbers: /proof/payability-report-2026-09-07.json. Signed service manifest: /proof/index.json.