x402 API outages: week 44, 2026
98.9% of 1,932 daily checks were up across 333 x402 APIs (Oct 27 to Nov 1, 2026, UTC days). 97.7% of those checks returned a valid x402 payment request.
Data coverage: our daily checks started Oct 27, so this week has 6 checked days, not 7 (no checks on Oct 26).
- APIs with at least one failed check: 9
- Down 2+ days in a row: 3 (Trust, Security & Verification 2; Crypto & Onchain Data 1)
- Failed every check this week: 1
- Had a failed check during the week and were up at our latest check: 2
- Down right now (2+ failed checks in a row, as of Nov 2, 2026, 7:07 AM ET): 3, by cause: server error (HTTP 5xx) 2, no answer within 8 s 1
- Failed one check, not yet counted as down: 4 (server error 2, no answer within 8 s 1, endpoint not found 1)
Daily share up (all checked APIs, each day’s latest check): Oct 27 99.1%, Oct 28 99.1%, Oct 29 98.2%, Oct 30 98.3%, Oct 31 98.6%, Nov 1 97.4%.
Common failure types: our daily history records only up/down and valid/invalid per day, not the cause, so causes are taken from the latest check. Among APIs without a valid x402 payment request at the latest check, the most common causes were server errors (HTTP 5xx, 4) and no answer within 8 s (2), followed by other-auth requests (HTTP 401/403, 2) and rejected unpaid requests (HTTP 400, 2).
Leaderboard snapshot, Nov 1, 2026, 1:30 PM ET
Most reliable this week
180 APIs passed every daily check this week with a valid x402 reply (5+ checks so far) and hold grade A. These 10 have the top grade score; ties are ordered by the most checks, then the fastest reply at our latest check.
| # | API | Checks so far | Grade | Latest reply |
|---|---|---|---|---|
| 1 | corpusAI | 6 of 6 up | A (100) | 110 ms |
| 2 | API Acre | 6 of 6 up | A (100) | 118 ms |
| 3 | OneShot | 6 of 6 up | A (100) | 125 ms |
| 4 | StableStudio | 6 of 6 up | A (100) | 157 ms |
| 5 | ASIN402 | 6 of 6 up | A (100) | 167 ms |
| 6 | 402post | 6 of 6 up | A (100) | 198 ms |
| 7 | StableUpload | 6 of 6 up | A (100) | 205 ms |
| 8 | TrustLayer | 6 of 6 up | A (100) | 214 ms |
| 9 | ClawFetch.ai | 6 of 6 up | A (100) | 279 ms |
| 10 | Yield.xyz | 6 of 6 up | A (100) | 288 ms |
Top movers (grade and score changes)
Grades started on Oct 31, 2026 and per-listing grade history is kept from this snapshot on, so grade movers start with next week’s note. Grades this week (348 graded APIs, checked Oct 31, 2026, 2:50 PM ET to Nov 1, 2026, 1:30 PM ET): A 195, B 91, C 25, D 8, F 29. Per-API grade baseline (JSON).
How we measure
One unpaid request per API per day to its example endpoint, 8 s timeout, never paid. Up means an HTTP answer below 500 that is not 404 or 410. Each day counts its latest check; days without a check are skipped. An API counts as down only after 2 or more failed checks in a row. Left out: 13 listings whose check we are updating on our side, and 2 where our checker gets a TLS error (HTTP 525), which is our problem, not the service’s. Including them, 98.4% of 2,018 checks across 348 APIs were up and 95.0% returned a valid x402 payment request. Data as of Nov 2, 2026, 9:10 AM ET.
These counts cover x402 APIs listed on YourAITools, not every x402 endpoint. Live status: x402 APIs down right now. Monthly report: State of x402: November 2026. Follow outages as they happen: RSS or JSON Feed. Data license CC BY 4.0, see our open dataset.