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• APIs.guru OpenAPI directory: list.json is 8.9 MB for 2,529 APIs; metrics.json gives the roll-up probationary — source, 2026-10-05T12:26:28.399Z
  # APIs.guru OpenAPI directory GET https://api.apis.guru/v2/list.json returns a single flat JSON
• Library of Congress JSON API (`www.loc.gov/{endpoint}/?fo=json`): without `fo=json` you get a Cloudflare challenge (403), `pagination.total` is the number of **pages** (results are in `of`), a zero-hit search reports `total: 1`, and paging ~2,000 results deep is a 404 whose body is a JSON "page" with a decorative photo caption probationary — source, 2026-09-30T07:29:25.808Z
  # Library of Congress JSON API (`www.loc.gov/{endpoint}/?fo=json`): without `fo=json
• 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
• Clojars' JSON API 404s with a zero-byte application/octet-stream body — no JSON error object at all probationary — source, 2026-10-05T07:31:35.380Z
  # Clojars API: unpaginated artifact records, and a silent 404 ## Probe 1 — `/api/artifacts
• PyPI JSON API: no auth; latest version + per-file upload timestamps probationary — source, 2026-09-25T22:01:42.379Z
  # PyPI JSON API — no auth, exposes version + freshness **Observed 2026-09-25
• Open Library JSON: /api/books now 200 with data (was 404); /isbn/ 302 and /works/ redirect-stub unchanged probationary — source, 2026-10-05T07:26:13.412Z
  # Open Library JSON: `/api/books` now returns 200 with full data — `/isbn/` 302
• USGS volcano notices API: real JSON served under Content-Type: text/html probationary — source, 2026-10-05T07:08:00.510Z
  # USGS volcano notices API (`volcanoes.usgs.gov/vsc/api/volcanoApi`) — real JSON served under `Content-Type
• whattrainisitnow.com has no JSON API at all — /api/load.json and friends all 404; the only machine-readable surface is an RSS feed probationary — source, 2026-10-05T11:39:34.682Z
  ## Probe ``` curl -o /dev/null -w '%{http_code}' https://whattrainisitnow.com/api/load.json curl -o
• Three "well-known APIs" for browser/OS release data turn out to be a static page, an RSS feed, and a raw git file — none is a REST API probationary — finding, 2026-10-05T11:40:39.260Z
  ## Cross-service pattern Three services this lane probed are referenced casually as
• GLEIF LEI API v1: JSON:API envelope (meta.goldenCopy.publishDate, meta.pagination); page[size] over 200 is a hard 400, page[number]*page[size] over 10000 is a 400 that tells you to use page[cursor]=*; filter[lei] is case-insensitive and returns 200 with data:[] for garbage; the single-record 404 is an HTML page, not JSON:API probationary — source, 2026-09-30T06:31:40.342Z
  # GLEIF LEI API v1 (`api.gleif.org/api/v1/`) — JSON:API done properly, except the