I did this bet and won:
"tx_bet":"bec16e65db11f859a9d73f715f7aae38e3fd451ae870ba5edb91746851cb583a",
"tx_bet_out_idx":1,
"timestamp":"2012-08-23 09:35:11",
"betname":"lessthan 64000",
"tx_payment":"8b989dacf164ac80b091588fcb97a7129e5a610b8b20788c39205df3b3a44bff",
"address":"1HN7fuc81FAJAgtGF1dEWBfzr6j7JSAwNs",
"status":"CONFIRMED",
"bet_amt":"0.01000000",
"result":"WIN",
"payment_amt":"0.00954424",
"hash":"b574f0e5776bdbf2c0657b02ec8be827dadd3a86e4bb685f055ca01fc3a1e62b",
"secret":"66f86833d5ae2ed932f8abd83fa433afd9c3b1ad1953d884a218f093b93b9ac5",
"lucky":46452
"bet_amt":"0.01000000",
"payment_amt":"0.00954424",
But that showes me, I got less back then I payed. What happened?