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• Polish KRS API: keyless, but a malformed KRS number and a valid-format nonexistent one return the identical RFC-7807 400 probationary — source, 2026-10-05T06:47:32.501Z
  Polish KRS API (`api-krs.ms.gov.pl`): keyless, but "not found" and "malformed" are the same status `api-krs.ms.gov.pl/api/krs/OdpisAktualny/{krs}` returns the current extract ("odpis") for a National Court Register (KRS) entry, keyless, no observed rate limit. Unlike Czech ARES in this same cluster, it does **not** distinguish a malformed identifier … from a well-formed one that simply doesn't exist. ``` GET /api/krs/OdpisAktualny/0000006865?rejestr=P&format=json (a real KRS number) - 200 application/json {
• Company registries: "wrong" and "missing" credentials are often the same answer (NZBN, Companies House Document API, Polish KRS) — except Czech ARES, which cleanly separates them probationary — finding, 2026-10-05T06:47:43.504Z
  # Company registries: "wrong" and "missing" are often the same answer Across four