judge0.x402.paywithlocus.com/judge0/list-languages
1.Catalog declaration
| Resource URL | https://judge0.x402.paywithlocus.com/judge0/list-languages |
| Source | cdp_bazaar |
| Declared method | POST |
| Network | eip155:8453 |
| Receiving address | 0x3c5cbe28eca3b96023c45d3f877da834f1c7d5fa |
| Declared price (base units) | 5000 |
| Catalog status | active |
| First seen / last seen | 2026-08-31 01:03 UTC / 2026-10-20 01:01 UTC |
| Catalog-reported calls / payers (30d) | 2 / 2 |
2.Probe history
| Probed at | Method | Verdict | HTTP | Latency | Reason |
|---|---|---|---|---|---|
| 2026-10-20 04:40 UTC | POST | pass | 402 | 328 ms | — |
| 2026-10-18 13:40 UTC | POST | pass | 402 | 321 ms | — |
| 2026-10-17 04:40 UTC | POST | pass | 402 | 533 ms | — |
| 2026-10-15 15:40 UTC | POST | pass | 402 | 431 ms | — |
| 2026-10-14 12:40 UTC | POST | pass | 402 | 396 ms | — |
| 2026-10-12 21:40 UTC | POST | pass | 402 | 417 ms | — |
| 2026-10-11 21:40 UTC | POST | pass | 402 | 758 ms | — |
| 2026-10-10 21:40 UTC | POST | pass | 402 | 399 ms | — |
| 2026-10-09 21:40 UTC | POST | pass | 402 | 362 ms | — |
| 2026-10-08 16:40 UTC | POST | pass | 402 | 705 ms | — |
| 2026-10-07 13:40 UTC | POST | pass | 402 | 439 ms | — |
| 2026-10-06 16:40 UTC | POST | pass | 402 | 482 ms | — |
| 2026-10-05 04:40 UTC | POST | pass | 402 | 2188 ms | — |
| 2026-10-04 13:40 UTC | POST | pass | 402 | 286 ms | — |
| 2026-10-03 13:40 UTC | POST | pass | 402 | 382 ms | — |
| 2026-10-02 16:40 UTC | POST | pass | 402 | 344 ms | — |
| 2026-10-01 22:40 UTC | POST | pass | 402 | 420 ms | — |
| 2026-10-01 04:40 UTC | POST | pass | 402 | 423 ms | — |
| 2026-09-30 13:40 UTC | POST | pass | 402 | 644 ms | — |
| 2026-09-27 10:31 UTC | POST | pass | 402 | 262 ms | — |
| 2026-09-23 10:30 UTC | POST | pass | 402 | 355 ms | — |
| 2026-09-19 11:24 UTC | POST | pass | 402 | 245 ms | — |
| 2026-09-17 11:24 UTC | POST | pass | 402 | 293 ms | — |
| 2026-09-12 11:24 UTC | POST | pass | 402 | 318 ms | — |
| 2026-09-09 11:24 UTC | POST | pass | 402 | 310 ms | — |
| 2026-09-04 11:24 UTC | POST | pass | 402 | 332 ms | — |
3.L1 — real purchases
1 of 1 paid attempts settled on-chain, and 1 of those also returned a 2xx response (delivered). Each settled row carries its on-chain transaction hash, and that transaction is the evidence. On this page a receipt means the seller's own settlement receipt (PAYMENT-RESPONSE); a settled row can have none (see “tx from our index”). A settled row reads as nonce-bound when the on-chain re-read also matched the one-time signature nonce we generated for that purchase, and amount + payee when it matched amount, payee, asset and chain with no nonce on record — the binding shipped on 2026-09-04, so earlier rows carry the weaker evidence and keep their label rather than being demoted (methodology). settled is the transfer we confirmed on-chain; delivered is the response arriving. A settled row whose paid request answered 5xx counts as settled and not as delivered — definitions.
Terms in this table
settled (nonce-bound)- vet402 confirmed the USDC transfer on-chain, and the on-chain re-read also matched the one-time nonce vet402 signed for that purchase.
L2 no_declaration- the listing declares no output schema to check the response against.
Whose side- the same words as the seller page: seller's side only after failures on two different days (UTC), marked “under re-check”; vet402's side; or not sorted (the rules).
| Attempted at | Result | HTTP | On-chain tx | Latency |
|---|---|---|---|---|
| 09-30 03:312026-09-30 03:31 UTC | settled (nonce-bound) | 200 | 0xf17432f9…1e61 | 1673 ms |
| 5000 units (≈ $0.005 USDC) · L2 no_declarationWhose side: no failure (delivered) | ||||
Embed this record
Run this endpoint? Show the settle-through record vet402 measured — the badge reads 1/1 settled · 1 delivered and updates as the record grows. It carries the host it is about and the date it was last measured, so a saved copy cannot pass itself off as current. It states a measurement, not a rating.
[](https://vet402.com/observatory/e/1db02f23-8604-4fb7-99a8-4fe47f5d23f4)4.Catalog listing events
No listing changes observed.
unverified is not a failure; a fail is published only after two consecutive failing probes. Definitions: methodology.
5.Dispute this record
Think a measurement above is wrong? Say which probe or purchase and what you observed instead. One person reads it and replies. The record is never deleted on dispute: if it was wrong, the correction is published with the same weight; if it was right, it stands. Operators who control the receiving address can also sign a dispute via POST /api/v1/observatory/disputes (API reference), which re-measures through the normal publication gate.