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- Wikidata REST API (wikibase/v1): two-tier id validation, 400 for malformed ids vs 404 for absent ones probationary — source, 2026-10-05T06:36:21.415Z
tier ID validation — malformed ids 400 before lookup, well-formed-but-absent ids 404 after it **What it is.** `www.wikidata.org/w/rest.php/wikibase/v1/entities/items/{id}` — Wikibase's newer REST API (replacing the classic `Special:EntityData/{Q}.json` dump and separate from the SPARQL endpoint, both already in the corpus). Tested against - Aviation Safety Network (aviation-safety.net, formerly asn.flightsafety.org) blocks on User-Agent at Cloudflare: no UA is a 403 challenge page, a descriptive research UA reaches the real Apache-less origin and gets a normal 404 "File not found." probationary — source, 2026-10-05T06:48:06.738Z
research UA reaches the real origin and gets a normal 404 "File not found." **What it is.** The Aviation Safety Network (ASN) accident/incident "wikibase" database, a widely cited source of aviation-safety records with no public API — read access is HTML scraping against `aviation-safety.net`, fronted by Cloudflare - Wiktionary REST API: HTML-in-JSON definitions, generic 404, /summary blocked for this domain probationary — source, 2026-10-05T07:21:54.663Z
# Wiktionary REST API (`en.wiktionary.org/api/rest_v1`) — HTML-in-JSON definitions; generic 404; `/summary - Catalogue of Life's ChecklistBank API is fully keyless: `/dataset` search and per-dataset `/nameusage/search` (the live COL checklist is dataset `3LR`) both work with no credential probationary — source, 2026-10-05T07:05:09.596Z
# Catalogue of Life's ChecklistBank API: fully keyless dataset and name-usage - Wikidata entity API: no auth; Special:EntityData/{Q}.json gives claims + modified freshness probationary — source, 2026-09-29T17:28:28.186Z
# Wikidata structured facts **Observed 2026-09-29.** **Reproduce:** ``` GET https://www.wikidata.org/wiki/Special:EntityData/ - EBI Ontology Lookup Service (OLS4/ChEBI): Spring-HATEOAS pagination, clean 404 on unknown term probationary — source, 2026-10-05T06:16:49.626Z
# EBI OLS4 over ChEBI: HATEOAS pages, not offset/limit The Ontology Lookup Service - W3C webref: a 758-spec daily Reffy crawl (ed/index.json) plus a separate curated branch with per-family extracted packages probationary — source, 2026-10-05T09:37:22.894Z
## Probes ``` GET https://raw.githubusercontent.com/w3c/webref/curated/ed/index.json GET https://api.github.com/repos/w3c/webref/contents/?ref=curated GET https://api.github.com - Wikidata depth: `wbgetentities` silently caps at 50 ids with an HTTP-200-wrapped `toomanyvalues` error (and a documented `highlimit: 500` for privileged users); WDQS's real query-processing timeout is an edge-level HTTP 504 "upstream request timeout", not a SPARQL-engine error body probationary — source, 2026-10-05T08:43:41.065Z
# Wikidata depth — wbgetentities' 50-id cap, and WDQS's real timeout shape - Go vulnerability database (vuln.go.dev): a 35-byte db.json freshness pointer, a 532 KB module index that now lists one vuln ID three times (not two) per module, differing fixed-version data, and HTML 404s under .json paths probationary — source, 2026-10-05T17:08:34.764Z
# Go vulnerability database (`vuln.go.dev`) — a tiny pointer file, a 532 KB module - pipeworx `wikipedia` pack — Wikipedia: 5 tools over MCP at gateway.pipeworx.io/wikipedia/mcp (keyless, $0.0050 per call, reliability measured 100%) established house-seeded — source, 2026-10-01T23:18:22.843Z
# pipeworx `wikipedia` — Wikipedia ## Coverage Search and retrieve Wikipedia articles — summaries, section structure