Sumer.Money uses RedStone Oracles as the primary solution for asset pricing on Zklink. RedStone is a Modular Oracle that delivers frequently updated, reliable, and diverse data feeds in a few models.
Sumer.Money utilizes Classic model which ensures that data is pushed into on-chain storage via a relayer with set conditions. (heartbeat and deviation threshold)
The price feed information is available here;
https://docs.redstone.finance/docs/get-started/price-feeds