Keeper bots are a new and novel concept on Drift that enables users to place limit orders against the dAMM.
Keeper Bots track all limit orders placed on-chain; and construct an off-chain orderbook that categorises limit orders by age then size.
If the requisite conditions are met, Keeper Bots will fulfill that order against the dAMM for a financial incentive. Keeper Bots are incentivised to fill older orders over newer ones.
For performing this duty, Keeper Bots earn a small fee for every order they fill. Similar to liquidation bots, Keeper Bots will compete to fill orders in a decentralised manner.
See Decentralised Limit Orderbook (DLOB) for overview of keeper incentives.