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---
## National vehicle-registration and recall APIs split into open vs. gated, with no shared gate convention
- Five national vehicle-data APIs split cleanly: NHTSA vPIC (US) and RDW (Netherlands) are fully keyless with generous limits, while UK DVLA, UK MOT history, and Norway's Statens vegvesen are auth-gated — each with a different refusal mechanism [obj_01M45KH13YKJWYNN49MPFQH7D4].
- UK DVLA's Vehicle Enquiry Service answers a plain GET with an AWS API-Gateway 403 MissingAuthenticationTokenException, as if the GET route doesn't exist, because the real API is POST-only [obj_01M45KF9RCS7NN626M9RWK3BVF].
- UK's MOT history API sits behind a double CDN stack (CloudFront in front of Imperva) and refuses with a vendor-namespaced JSON error code (MOTH-UA-01), issuing Imperva tracking cookies even on the rejected request [obj_01M45KFB7VTS014MSXBRXS1F8J].
- Norway's Statens vegvesen refuses with a standards-based RFC 9728 WWW-Authenticate pointer to an OAuth discovery document requiring mTLS-bound tokens, not just a bearer token [obj_01M45KH0HJZN1M1JG794C8ZMEY].
- RDW (Netherlands) needs no app token and honors $limit up to at least 50,000 rows with no clamp, unlike many Socrata government datasets clamped at 1,000 [obj_01M45KFEA5EF0VYDN44P3E7RD6].
- NHTSA vPIC decodes wildcard VINs without requiring modelyear, exposes the same decode as two incompatible JSON shapes (DecodeVin vs DecodeVinValues), and reports multiple error codes as a comma-joined string inside an HTTP 200 [obj_01M45KF0F8Q8NGBT0HFXAQBTC2].

## Status code and body disagree about success, differently on the same host
- NHTSA recalls and complaints (same host) both return HTTP 400 for a no-match query while the body itself says "Message":"Results returned successfully" with Count:0 [obj_01M45KFNXEE5BB20XYFFFHGY4W][obj_01M45KF21SK5PVSK3DQ5SGKK23][obj_01M45KF3P5M121D51SC6R1XRR5].
- NHTSA SafetyRatings, on the exact same host, doesn't share that trap — an identical no-match query returns a genuine HTTP 200 with status and body in agreement [obj_01M45KF56CP8TGRCX4HX55VR4C].
- NHTSA complaints additionally truncates VINs to 11 of 17 characters as an undocumented privacy measure [obj_01M45KF3P5M121D51SC6R1XRR5].
- Transport Canada's recall API has an orthogonal trap: query-string filters are silently ignored and return a parameter schema, not data; only path-segment filters actually work [obj_01M45KFCTGXECN1FSZ58SV8BGY].

## Legacy content negotiation and dead hosts
- EPA fueleconomy.gov defaults to XML and only serves JSON via explicit Accept: application/json; cascading menu endpoints are the only documented path to the numeric vehicle id [obj_01M45KF6RHPG2Q2BAZDYF9BS7D].
- CarQuery API's DNS resolves to a live-looking AWS IP, but both TLS and plaintext ports time out on every attempt — a third distinct "dead API" failure mode, neither NXDOMAIN nor a clean refusal [obj_01M45KF878D3RPP4QSTG3DKE6Z].

## Disagreements and open questions
None recorded as of 2026-10-22.

## Possibly stale
None recorded as of 2026-10-22.

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