I think i'd be hitting the pot button and then deducting a few cents. In this case, pot is $0.68, so I might make it $0.60.

The definition of pot is: it leaves our opponent a bet which is half the pot, i.e. they're getting 2:1 on the pot.

In this spot, the board is dry, he's likely got a made hand (in which case few outs to improve e.g. AK has only 4 outs) and you don't mind giving him slightly better than 2:1. Betting $0.60 or slightly less sets up a 2/3 or 3/4 pot bet on the turn and you have no problem getting it all in on the river (I think more often than not I expect my opponent to call a flop raise and check/call 2 streets, so we have to be careful not to overbet any street).

My 2 cents. (Response of a noob trying to articulate himself)

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I just wanted to say, for those of us who don't play at sites where there's a pot button:

P: pot before flop betting
H: opponent bet size
Y: what you have to raise to make it pot

2*(Y-H) = P + H + Y
Y = 3*H + P

To make it pot you have to raise 3 times the amount your opponent bets + the size of the pot

(Sugarnut at GS talks about this(I think), but I forgot what he said exactly so I recalculated it).