Okex is one of the oldest and most secure cryptocurrency exchanges in the world. Right now i have special for my followers where you can grab 10-200USD worth of crypto pretty much for free depending on what tasks you select to do.

Use this link to register (none other will work, you need to follow this one and click the REGISTER button) https://www.okex.com/promotion/DUWGDD

tldr;
- Deposit 100USD, buy and sell anything ie BTC (even loosing 1-5 USD) - get 10 USD.
- buy 100 USD of crypto get 10 USD
- deposit 100USD of crypto get 20usd trading rebate

and few others. Easy as hell, and free bitcoin/cryptocurrency to grab.