Looking into api.advstatistics.com reveals a site that barely exists. It returns an HTTP 404 error and the only page content is a JSON message saying not found. For an API service, that would be like walking into a store that has no employees, no signs, and no products on the shelves.
Most legitimate API providers, even smaller ones, have a clear domain registration, some kind of contact channel, and at least a basic website showing what they offer. Here, the WHOIS record for the .com domain comes back empty — no registrant name, no organization, no dates. That alone is unusual enough to stop you from sharing any data with this site.
There's no privacy policy, no terms of service, and no way to reach a human. The site does have a valid SSL certificate and uses Cloudflare, so it's not entirely amateurish technically. But without knowing who is behind api.advstatistics.com or what it's supposed to do, there's no reason to trust it. If you're considering using this service, wait until the owners come forward with real contact details and a working site.