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Is it FREE?

Yes. The service is free, but have some limits. For view current limits, go to profile page.

How to upgrade to PREMIUM without money?

You can use PREMIUM plan maximum 6 month free if you developer and can help project. Details...

Is it really secure?

Yes. All data transfer via HTTPS/TLS and with HMAC SHA-256 signature.

When i can use it?

Web-sites authorization or anywhere with API.

Is it really secure?

Yes. All data transfer via HTTPS/TLS and with HMAC SHA-256 signature.