A decentralized finance (DeFi) network that powers the aUSD ecosystem, Acala launched a new notification feature on December 01, 2022. This feature brings push notifications for on-chain and off-chain events to Acala and Polkadot ecosystem developers and DeFi users.
Source: https://www.thecoinrepublic.com/2022/12/04/the-launch-of-push-notifications-to-polkadot-defi-users/