Transportation — entry 065 of 69
Transport for Washington, US
WMATA's developer portal runs on Microsoft Azure API Management, and despite the marketing language, access is gated by a free subscription key rather than an OAuth flow — requests carry the key as an api_key header or query parameter against api.wmata.com, and requests without one are rejected by the APIM gateway before reaching the backend. All rail and bus data (positions, predictions, incidents, station info) is free after registering for the default tier.
AuthenticationAPI KeySign up with the provider to obtain credentials.
HTTPSSupportedTraffic is encrypted in transit.
CORSEnabledCallable directly from browser JavaScript.
PricingFreeNo paid tier — free for the documented use case.
FormatsJSON, XMLResponses can be requested as JSON or XML.
GreatAPIs Score
Score70
Authentication15/25API key required
Pricing20/20Free to use
Docs0/20No docs or spec available
Formats15/15Supports 2 response formats
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/transport-for-washington-us/"><img src="https://greatapis.com/badge/transport-for-washington-us.svg" alt="Scored 70 on greatapis.com"></a>Auth quickstart
- Sign up with the provider to get an API key.
- Send it on every request as a header
Authorization: <key> - The exact header isn't documented — Authorization is a common default; confirm in the provider's docs.
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.