Instant provides convenient access to the user-posted liquidity pool powered by the Oasis contract.
This is the easiest way for users to trade Ether and Wrapped Ether for Dai.
To put it simply: Instant is for users that want quick and easy, while the traditional interface is for those that want to have access to a more robust experience featuring charts, volume and a variety of order types.
Users can now access Eth2Dai with any mobile or desktop browser to check prices, the orderbook or trade history. This is enabled by a GraphQL database.
Eth2Dai products have no third party to any transaction, no central custodianship, all trades are peer-to-peer, and the transaction is performed and settled on-chain without the need for any intermediary.