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The sum of all the Steem Power of all your followers must be bigger than 500 Steem Power.

Is there any means to know it@fabien??

https://steemdb.com/api/accounts?account=username

search for "followers_mvest" if its over ~1,000,000 then you qualify.
1 mv is currently worth 486.386 steem.

Thanks @acidyo It helps.

Thanks @acidyo It helps. And why is it showing follower/following counts lesser than I actually have on my steemit?