My wife, who is out of work, is providing emergency childcare to some friends of ours for $20/hr. People are really desperate for this and I'm sure she could make more if she wasn't just doing it as a favor for our friends.
$20 seems to be above-market everywhere for one kid, and everywhere except SF and NY for two kids. But it wouldn't surprise me if there's finer-grained variation - sitters probably cost more in the richer parts of a metro area than in the poorer parts of the same metro area.
I pay the people who house sit and watch my pets, I still consider it a favor in addition to paying them.