An attacker compromised the Amps contract 12 hours ago, stealing ~$6,700 USDC from 112 Amps users. 

@phil and the Amps team fixed the issue and refunded users. @horsefacts and the Farcaster team have been assisting. Farcaster wallets are safe and unaffected.

Who was affected?

Users who gave Amps an allowance to withdraw USDC from their wallet to purchase likes and recasts were affected.

Users who simply used Amps to receive funds for likes and recasts are unaffected. Users who did not use Amps are unaffected.

What happened?

The Amps team will publish a detailed report soon.  In short, their contract had a vulnerability and the attacker was able to withdraw USDC that the users have given Amps permission to withdraw. 

Some users gave Amps the permission to withdraw all USDC from their wallet, and the attacker was able to withdraw all USDC. 

Are Farcaster wallets unsafe?

No, Farcaster wallets remain safe to use. The exploit is entirely within the Amps contract and only affects users who explicitly gave Amps the permission to access their USDC.

What should I do to be safe?

Never give permissions to withdraw unlimited funds (as a user) and never ask for these permissions (as a dev). It is safer to ask user to transfer in a fixed amount (e.g. 100 USDC), and top up as needed.

随着mini app的越来越多，作为用户在授权给mini app的tokne的使用额度的时候，一定一定要限制好，最好就10USDC就够了。

不要为了懒，而使用了默认无限的额度，一定会有开发者或者团队，为了你能长期使用而鼓励你使用无限的额度。

安全意识一定要有。