MakerDAO transferred $250 million from Coinbase to the DAI Peg Stabilization Module (PSM) to maintain the peg after the USDC reserve in DAI (which needs to exceed at least $200 million to be considered safe) approached dropping below $60 million earlier today. PSM is a collateral pool that allows users to mint DAI by exchanging USDC at a 1:1 ratio and arbitrage DAI back to being pegged to the dollar. If the PSM reserve is depleted, the price of DAI may be higher or lower than $1.