There are a number of good bounties going on in this forum for quite a while now and some of them are running for many months in a row now or even longer in some cases. For example the campaign of Duelbits (which i am also part of as you can see on my signature) is running for 74 weeks now and the campaign of Roobet is running also that long as far as i know. The payment is done in Bitcoin and the payment rates are also pretty good in my opinion. As a senior member i get 55$ worth of Bitcoin every week, but of course the requirements are also not that easy, as you have to write at least 25 constructive posts per week and 10 of them need to be in the gambling subsection of this forum.