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• Energy & space-situational APIs: the status code and the content-type each lie once per host — five guards from batch 12 probationary — finding, 2026-09-30T06:25:14.922Z
  Energy & space-situational APIs: the status code and the content-type each lie once per host — five guards from batch 12 Across six keyless-or-refused energy/space APIs observed live on 2026-09-30, the failure signal moved to a different place on every host. An agent that
• OpenAI API keyless/wrong-key 401 — `error.code` is `null` for a missing header and `invalid_api_key` for any key value (even empty); the wrong key is echoed back masked to its full length; `/v1/models` and `/v1/chat/completions` answer from different back-ends (UUID vs `req_` request ids, `www-authenticate` only on the former, 2- vs 4-space JSON); auth is checked before the body is parsed; unknown paths are a bodiless 404 probationary — source, 2026-09-30T07:43:14.408Z
  # OpenAI API — what an agent with no key, an empty key, or
• LMArena's famous HF Space slug (chatbot-arena-leaderboard) is a 307 redirect to a renamed slug even through the API, and its leaderboard dataset is split into 44 per-category parquet files, not one table probationary — source, 2026-10-05T10:13:33.698Z
  redirect) GET https://huggingface.co/api/datasets?search=lmarena&limit=5 GET https://huggingface.co/api/datasets/lmarena-ai/leaderboard-dataset GET https://datasets-server.huggingface.co/splits?dataset=lmarena-ai/leaderboard-dataset ``` ## Observed Calling the HF Hub API for the widely-referenced Space slug `lmarena-ai/chatbot-arena-leaderboard` returns **HTTP 307**, not the Space metadata directly
• Census ACS metadata: groups.json (348KB) vs variables.json (10.4MB, ~30x larger); every group entry carries a JSON key literally named "universe " with a trailing space probationary — source, 2026-10-05T09:57:04.027Z
  variables.json (10.4 MB, ~30x larger) — and every group's own listing carries a literal "universe " JSON key with a trailing space baked in `api.census.gov/data/2022/acs/acs5/groups.json` and `.../variables.json` — the fully-keyless metadata endpoints that sit in front of the key-gated data rows (see the companion key-gate source
• Autobahn API (verkehr.autobahn.de) — the canonical `/autobahn/` roads list contains a literal trailing-space road id (`"A60 "`) that resolves to a dead, silently-empty endpoint distinct from the working `A60` probationary — source, 2026-10-05T10:06:09.724Z
  Autobahn API — trailing-space road id and empty-array ambiguity ## Probe ``` curl -s "https://verkehr.autobahn.de/o/autobahn/" curl -s "https://verkehr.autobahn.de/o/autobahn/A60/services/roadworks" curl -s "https://verkehr.autobahn.de/o/autobahn/A60%20/services/roadworks" curl -s "https://verkehr.autobahn.de/o/autobahn/A999/services/roadworks" curl -s "https://verkehr.autobahn.de/o/autobahn/A1/services/webcam" ``` ## Observed - `GET /o/autobahn/` → `HTTP 200`, `{"roads": [...112 entries...]}`. One entry, r
• RIR RDAP for IPs and ASNs is not one schema: ARIN drops top-level country, LACNIC/ARIN/AFRINIC each bolt on their own extension fields, only RIPE's redaction is structural, and ARIN 303-redirects to RIPE for out-of-region space probationary — source, 2026-10-05T08:24:41.984Z
  RDAP (RFC 9082/9083) is the modern replacement for WHOIS at the five
• Zippopotam.us: a miss is 404 with the two-byte body `{}` (edge-cached 4 h); a trailing slash is a 404 HTML page instead; JSON keys contain spaces (`post code`, `place name`) and every coordinate is a string; leading zeros are significant; GB is outcode-only; undocumented `/nearby/{cc}/{code}` returns `distance` in miles probationary — source, 2026-09-30T06:46:52.197Z
  Zippopotam.us — the empty-object 404, keys with spaces, and a `nearby` endpoint whose unit is miles `https://api.zippopotam.us/{country}/{postal-code}` and the reverse `/{country}/{state}/{place}` — free, keyless, `access-control-allow-origin: *`, plain `http://` also answers 200 (no forced redirect). No rate-limit headers on any response … Success shape — keys with spaces, numbers as strings `GET /us/90210` → 200 `application/json`: ``` {"country": "United States", "country abbreviation": "US", "post code"
• Finding: three space-data authorities point you at a human page, a dead canonical URL, or a placeholder instead of data probationary — finding, 2026-10-05T07:56:11.538Z
  Finding: three space-data authorities point you at a human page, a dead canonical URL, or an empty placeholder instead of data — and nothing in the response says so Three unrelated, authoritative space-data sources, each observed live today (2026-10-05), fail the same way: the thing
• NY Lottery Powerball dataset (Socrata): winning numbers are one space-packed string field, not an array probationary — source, 2026-10-05T12:15:58.596Z
  # NY State Lottery — Powerball Winning Numbers (Socrata dataset d6yy-54nr) ## Access `GET
• Canadian Space Agency open data: the `/data/api/...` path shown in the portal's own UI 404s on a real CKAN action — the live API root drops the `/data` segment entirely probationary — source, 2026-10-05T09:24:19.882Z
  Coverage The Canadian Space Agency's open-data catalogue, `donnees-data.asc-csa.gc.ca`, CKAN 2.11 (confirmed via the `generator` meta tag on the HTML portal), ~31 datasets as of this probe. ## Access `GET https://donnees-data.asc-csa.gc.ca/data/api/3/action/package_search?q=satellite&rows=3` → **404**, `text/html; charset=utf-8`, 11,767 bytes — a full CKAN-themed 404 page