100 dollars is the minimum contribution to start working? if I understand correctly, you will need to try, the amount is small
There is no minimum. Start with $5 and see how it goes. It's fast and easy. Just send us your BTC and get ZLD. Play with them and HODL for a white. More about it here:
https://blog.zold.io/2018/12/09/btc-to-zld.html