You can do these quizes on coinbase wich will earn you a fairly decent amound of money in crypto wich you can then either sell of withdraw to a wallet

4 Open spots for Band protocol

https://coinbase.com/earn/band/invite/9kh0jx6p

1. Real world problems

2. Oracles

3. Earn crypto rewards

4 Open spots for COMP:

https://coinbase.com/earn/comp/invite/z5fpm6h7

Answers: 1. Earning interest on your crypto 2. Supply a crypto asset as a collateral 3. COMP token holders

4 open spots for XLM :

https://coinbase.com/earn/xlm/invite/8bhdzpk3

Answers: 1, A decentralized protocol that unites the world financial structure 

2. Facilitating low cost universal payments 

3. Transactions are fast, inexpensive and global 

4. To issue exchange, and transfer tokens quickly and efficiently 

5. It relies on cooperation of trusted nodes to confirm transaction