Control IoT Devices from Blynk IoT Cloud.
Blynk-Cloud API is a free Development API that requires apiKey authentication, is only available over HTTP and has unconfirmed CORS support.

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Yes. The Blynk-Cloud API is listed in the Development 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 Blynk-Cloud API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Blynk-Cloud API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
No. The Blynk-Cloud API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.