Paribus - Find out for free if online stores owe you a refund!
Paper.xyz - Paper provides commerce infrastructure for selling NFTs.
Lolli - Earn bitcoin when you shop online
GiveWell - GiveWell is a nonprofit dedicated to finding outstanding giving opportunities and publishing the full details of our analysis to help donors decide where to give.
Earny.co - Win prizes on Amazon purchases
Accept Crypto - Find out if a company or website accepts Cryptocurrency.