[im3w1l]

The code of an automated stable coin exists as a contract in the blockchain. That code can only directly measure and influence things on the blockchain. Thus it can only directly manage assets in the form of crypto.

The contract can indirectly learn about things that are off-blockchain, such as the $USD - $COIN exchange rate, but that requires someone to input that value into the blockchain, and use a complicated set of incentives, incentives stronger than the one to input a manipulated one. Performing off-blockchain actions, would require incentived agents, and be even more difficult or even impossible.