Staking, the present participle of stake, which means a wager, bet, or pledge. Tony is loaning Davey the money, but specifically to use as a wager, or stake, so

Staking, the present participle of stake, which means a wager, bet, or pledge. Tony is loaning Davey the money, but specifically to use as a wager, or stake, so it is Tony that is staking.