Transportation — entry 040 of 69
Transport for Denver, US
RTD Denver's original gtfs-developer-guide.shtml page is gone after a full site rebuild (now 404s); the transit agency's open-data offering now lives under open-records/open-spatial-information, split into static GTFS zip downloads (bus, light rail, commuter rail, plus the regional Bustang service) and three GTFS-Realtime protocol-buffer feeds (vehicle positions, trip updates, alerts). No API key is required, only acceptance of a redistribution license agreement.
AuthenticationNone requiredCall it straight away — no key, no signup.
HTTPSSupportedTraffic is encrypted in transit.
CORSDisabledBrowser calls need a server-side proxy.
PricingFreeNo paid tier — free for the documented use case.
FormatsGTFS, GTFS-RTResponses can be requested as GTFS or GTFS-RT.
GreatAPIs Score
Score94
Authentication25/25No authentication required
Pricing20/20Free to use
Docs14/20Documentation URL provided
Formats15/15Supports 2 response formats
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/transport-for-denver-us/"><img src="https://greatapis.com/badge/transport-for-denver-us.svg" alt="Scored 94 on greatapis.com"></a>Auth quickstart
- No key needed — call it now.
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.