According to Foresight News, smart contract wallet Argent has announced that the ArgentX account is now live on the Cairo 1 contract. Users can upgrade their ArgentX accounts to the new Cairo 1 contract, which requires a transaction, so ETH should be prepared in advance in the account.
Argent stated that the Cairo 1 contract has been audited by Consensys Diligence. The Cairo 1 contract offers many improvements for developers on Starknet, such as better syntax, optimized code, and a new compiler.