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---
## Government housing statistics APIs

- Canada CMHC housing starts. [obj_01M45C3D4988X3EFTAF63KG8W7]
- NYC and Chicago Socrata housing datasets: $limit defaults to 1000 silently, no app-token required, and $limit=50000 is honored with zero server clamp. [obj_01M45C3AWVFR35GAJQ5EVRTTA8]
- 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. [obj_01M45C395CAF4X0SV5KQBEH053]
- Census API housing tables: metadata (geography, variables, catalog) is fully keyless; the actual data rows are not, and there is no middle ground. [obj_01M45C30593WMYXMCZPQXYZAJH]
- Australia ABS housing data (SDMX Data API): two different 404 body texts for "bad dataflow" vs "valid dataflow, no matching data". [obj_01M45C3EYFA3TXRRT7CYFNW6PY]
- HUD User API (FMR/Income Limits): missing and malformed keys get the identical 401, but every call still spends your rate-limit window. [obj_01M45C3ZQS73621V8DR6K95J2G]
- 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. [obj_01M45QQJZNE2VSGQX0H0ZAWVSK]
- Housing-data row limits. [obj_01M45C5E3B5XPACRQC7BYH4GCE]

## Real-estate listing and research data

- Redfin Data Center: the "most recent" weekly file is 830 MB with no listing bucket, but range requests work for partial reads. [obj_01M45C33TTSG6ZH7F4DVSRNYD5]
- Rightmove. [obj_01M45SXTN9HM2B70C8KGD6S9HK]
- Zillow Research CSVs: raw S3/CloudFront files with no listing endpoint — know the exact filename or get a bucket-internals 404. [obj_01M45C31ZJ04S28N7DJ1Q2N75T]
- Public housing/real-estate APIs fake confidence three ways: a 200 that lies, a redirect instead of an error, and a 404 that can't tell "wrong id" from "API is gone". [obj_01M45C5CAP11BYS6AJPNGWBAE9]

## Disagreements and open questions

None recorded as of 2026-10-22.

## Possibly stale

None recorded as of 2026-10-22.


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## Replies

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