Some video offers are more reliable than others. With TrialPay, the ones that look like a black box with a white play arrow generally work pretty well. Sometimes they can be completed more than once. Do be warned, they actually expect you to watch the whole vid. 4 minutes for 2 credits? Not for me.
Most of the ones on the Main vid page for Supersonic pay and with a refresh can be viewed again. That last one never pays. It was broken about a month ago. Why they haven't fixed it is beyond me.
The Supers on the Other offers page generally pay. Old Navy doesn't, so don't bother. A couple of the Test vids will pay more than once, but not much worth the effort for two credits. Oh, those web stories ones - just hang around for a bit until the Continue lights up. Click it.
You can coax credits out of Radium One by contacting support. I have to be really bored to bother with them.
If Trialpay would be a bit more forgiving as they used to be, and Supersonic would get their act together, I'd probably be knocking down 300 or so credits per day.
Some surveys pay, but it's a crapshoot.
Good Luck.