The `google_travel_time` sensor provides travel time from the [Google Distance Matrix API](https://developers.google.com/maps/documentation/distance-matrix/).

You need to register for an API key by following the instructions [here](https://github.com/googlemaps/google-maps-services-python#api-keys). You only need to turn on the Distance Matrix API.

[Google now requires billing](https://mapsplatform.googleblog.com/2018/05/introducing-google-maps-platform.html) to be enabled (and a valid credit card loaded) to access Google Maps APIs. The Distance Matrix API is billed at US$10 per 1000 requests, however, a US$200 per month credit is applied (20,000 requests). The sensor will update the travel time every 5 minutes, making approximately 288 calls per day. Note that at this rate, more than 2 sensors will likely exceed the free credit amount. While this call frequency can not be decreased, you may have a use case which requires the data to be updated more often, to do this you may update on-demand (see automation example below).

A quota can be set against the API to avoid exceeding the free credit amount. Set the 'Elements per day' to a limit of 645 or less. Details on how to configure a quota can be found [here](https://developers.google.com/maps/documentation/distance-matrix/usage-and-billing#set-caps)

**Starting March 2025** Google will change the pricing scheme from the US$200 per month credit to 10,000 free requests. You should adjust your limit to 322 or less. You can find more information on the pricing changes in the [Google developer documentation](https://developers.google.com/maps/billing-and-pricing/faq#pricing-sheet).