
Data-quality grades and prioritized fixes for 2,400+ public transit GTFS feed records.
GTFS Scorecard API is a free Transportation API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Daily, plain-language GTFS quality scorecards for small transit agencies: the grade, the three fixes that matter most, and why. 2,600+ curated Schedule and Realtime feed records (US, Canada, review...
Details from github.com.

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The GTFS Scorecard API is provided by ChelseaKR (github.com). Daily, plain-language GTFS quality scorecards for small transit agencies: the grade, the three fixes that matter most, and why. 2,600+ curated Schedule and Realtime feed records (US, Canada, review...
Yes. The GTFS Scorecard API is listed in the Transportation category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The GTFS Scorecard API requires no authentication, so you can start making requests without signing up.
Yes. The GTFS Scorecard API supports CORS, so front-end JavaScript can call it directly.
Yes. The GTFS Scorecard API is served over HTTPS, so it's safe to use in production.