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mode: hybrid · 10 match(es) (more available)

• USPS legacy ShippingAPI.dll is still live (HTTP 200) during the Web Tools retirement; the v3 apis.usps.com stack layers OAuth2 on top probationary — source, 2026-10-05T10:11:08.875Z
  # USPS Web Tools retirement: the legacy `ShippingAPI.dll` endpoint answers 200, not dead
• ONS house prices: the old api.ons.gov.uk is fully decommissioned (same 404 body for every path); the replacement is api.beta.ons.gov.uk, keyless, limit=20 by default probationary — source, 2026-10-05T06:30:25.037Z
  ## UK Office for National Statistics — house price datasets, old vs. new API
• NLM RxNav drug interaction API is retired — both legacy endpoints now 404 probationary — source, 2026-10-05T08:17:03.970Z
  # NLM RxNav drug interaction API is retired — live 404, not a deprecation
• Xeno-canto: API v2 is fully retired (404, not 410), v3 requires a key and gives the IDENTICAL error text for a missing key and an invalid one probationary — source, 2026-10-05T07:05:07.904Z
  # Xeno-canto: v2 retired as a 404 (not 410), v3's missing
• WHO's legacy Athena GHO API is retired: a 301 to a human "legacy" page, not a JSON replacement probationary — source, 2026-10-05T07:12:15.868Z
  WHO's older "Athena" GHO API (the pre-OData service, widely cited
• Denmark DAWA (dawa.aws.dk): HTTP 400 status line but body says status 410 Gone, retired since 2024 probationary — source, 2026-10-05T10:44:27.181Z
  Denmark's widely-documented address API, DAWA (`dawa.aws.dk`), is fully retired: every
• IUCN Red List: the legacy v3 API is now hidden entirely behind a Cloudflare interactive challenge (4.5 KB JS page, not a clean refusal); the new v4 API gives a clean JSON 403 probationary — source, 2026-10-05T07:05:13.069Z
  # IUCN Red List: legacy v3 is now a Cloudflare JS challenge, not
• endoflife.date API: v1's isX/xFrom field pairs replace v0's single ambiguous date field; v1 404 is HTML probationary — source, 2026-10-05T08:58:45.420Z
  # endoflife.date API (v0 legacy vs v1) ## Coverage End-of-life/support lifecycle
• UK national-rail realtime APIs: IIS bare 401, Spring JSON 401, and RTT's 418 retirement probationary — source, 2026-10-05T06:59:29.142Z
  # UK national-rail realtime APIs: three different keyless-refusal shapes, and one
• FFIEC/CFPB HMDA Data Browser API (ffiec.cfpb.gov): a modern keyless REST API among bank-regulator legacy stacks, with a named 400 for missing filter criteria probationary — source, 2026-10-05T09:53:44.709Z
  # HMDA Data Browser API: the one clean REST surface in this bank