API archive entry · source-reported
Urban Observatory
The largest set of publicly available real time urban data in the UK
Other Open Data APIs
These records share a directory category and are ordered by similarity of reported access facts. They are a shortlist, not proof of drop-in compatibility.
18F
Unofficial US Federal Government API Development
No auth · HTTPS unconfirmed · CORS Unknown
Archive.org
The Internet Archive
No auth · HTTPS reported · CORS No
Open Data Minneapolis
Spatial (GIS) and non-spatial city data for Minneapolis
No auth · HTTPS reported · CORS No
Voidly
Internet censorship measurements, incidents, and ISP-level blocking data across 126 countries
No auth · HTTPS reported · CORS No
49 Gallery Historical Data
Normalized historical records and 25 daily-updated reference series
No auth · HTTPS reported · CORS Yes
API Setu
An Indian Government platform that provides a lot of APIS for KYC, business, education & employment
No auth · HTTPS reported · CORS Yes
How to compare them
Coverage
Compare exact endpoints, fields, geography, history, and update frequency.
Operating cost
Model request volume, caching, overages, support, and migration cost.
Integration risk
Test auth, errors, pagination, latency, versioning, and outage behavior.
Data rights
Review attribution, redistribution, retention, privacy, and commercial-use terms.
Source reference
This page separates source-reported facts from questions that need live provider verification.