You only need a pump.fun account to roll a hero — betting on the arena works with any Solana wallet. Two ways to get a pump.fun account:
Only the export route (step 3) touches a private key — never share it. PUMP.RPG never sees it; you connect with your own wallet.
It's pari-mutuel — you bet against other players, not the house. Every bet on a fight goes into one shared pool.
The odds shift live as people bet: the more SOL sitting on the other fighters, the bigger your payout. A 10% fee comes off the pool (5% to the winning hero's owner, 5% buys back $PUMPRPG) — winners always split the other 90%.
Nobody backed the actual winner? The highest-placed fighter that was backed pays out instead. If only one fighter got any bets all round, everyone's refunded.