Bike, scooter, motorcycle, wheelchair and walking routes across Europe, with safety indicators.
On va où ? API is a free Transportation API that requires apiKey authentication, is served over HTTPS and does not support CORS, so it should be called from a server.
Bike, e-bike, scooter, motorcycle and wheelchair routing. Three variants per request, billed as one. Free plan.
Details from onvaou.app.

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Yes. The On va où ? 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.
Yes. The On va où ? API uses apiKey authentication, so you need to register for credentials before making requests.
Not directly. The On va où ? API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The On va où ? API is served over HTTPS, so it's safe to use in production.