Here is proof of payment from one of my favorite paid to read sites Hits4Pay.
Hits4Pay is a site that pays you to read emails that advertisers send to you through your free Hits 4 Pay account. Once signed up you will earn $10 just for signing up for the free account! This gets you well on your way to the $25 cash out point which is sent right to your paypal address monthly.
You will earn .02 cents for every email that they send to your free account and you read. To earn money faster join their great affiliate program. For each person you sign up you'll receive .01 for every email they read..plus .01 for every email their referrals read. I know it doesn't sound like a lot..but it really does ad up over time.