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Any minimum value for the tokens? I mean, what should be the amount of tokens I need to give?

Only what you want! And it does not have to be the same prize every week. Most of the other sponsors give 1 HSBI share.

What's the monetary value of 1 HSBI? In $HIVE? Just I need an Idea :)

One HSBI share is 1 Hive. When you buy one for yourself you must give one to another user. So actually it's two hsbi for one Hive. https://www.hivesbi.com/

Okay. Thanks.