Both UTG and BTN are running roughly 50/5 over 100 hands. BTN is quite aggressive post-flop, but I don't know if he's min-bet before. I figured I had quite a lot of fold equity with the check-raise.

Poker Stars No-Limit Hold'em, $0.02 BB (7 handed) - Poker Stars Converter Tool from Play Online Poker, Site Reviews & Poker Forum | FlopTurnRiver.com

saw flop

MP1 ($2.96)
MP2 ($1.58)
CO ($0.68)
Button ($4.42)
SB ($3.59)
Hero (BB) ($3.24)
UTG ($1.24)

Preflop: Hero is BB with 8, 5
UTG calls $0.02, 3 folds, Button calls $0.02, 1 fold, Hero checks

Flop: ($0.07) 6, 7, Q (3 players)
Hero checks, UTG checks, Button bets $0.02, Hero raises $0.12, 1 fold, Button raises $0.22, Hero calls $0.12

Turn: ($0.55) 6 (2 players)
Hero bets $0.39, Button calls $0.39

River: ($1.33) 8 (2 players)
Hero?