Filecheck doesn't use account and only uses information that is publicly available.
Using accounts for filechecks can easily lead to traffic usage. For example some services allow user to enable so called *direct download* feature and then instead of info site, the direct download would start and reduce available traffic.
Isracloud doesn't provide an api (as far as I know) and JDownloader already uses a workaround to fetch the filename. Once the download has started, the filesize will be available too.
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JD-Dev & Server-Admin
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