One page per live API: where the data comes from, how often it is refreshed, which checks a release must pass before it is published, and what it does not cover. The coverage page summarises the same sources in one table.
Sources, refresh schedule, validation checks and known limits of the US Geographic & Demographics API: Census ACS 5-year estimates for ZCTAs and counties, the 2020 ZCTA-to-county relationship file and NCES public schools.
Sources, nightly refresh, XBRL concept mapping, restatement handling, validation checks and known limits of the US SEC Filings & Financial Data API.
Sources, refresh schedule, matching rules, validation checks and known limits of the US Sales Tax Rates API, built from the Streamlined Sales Tax rate and boundary files.
Sources, weekly refresh, file discovery, supplier grouping, validation checks and known limits of the UK Council Spending API, built from the spending files English councils publish under the Local Government Transparency Code 2015.