“Insufficient Balance” validation before donation → fails during processing

[maryjaf]

I have USDC balance (below pics), and when I tap on donate the insufficient balance isn't shown, but during processing donation I see a balance error.

Steps to Reproduce

1. Connect wallet (MetaMask)
2. Have balance in USD Coin (PoS) (e.g. ~25 USDC)
3. Go to QF cart
4. Select USDC.e as donation token
5. Enter donation amount (e.g. 0.00001)
6. Click Donate
7. Confirm transaction

Actual Result
No warning or validation is shown before transaction
Donation proceeds to processing state
Then fails with:
Error: ERC20: transfer amount exceeds balance
UI shows: Donation failed

Expected Result
Before transaction:
User should see “Insufficient balance” if they don’t have the selected token

Screenshots

[laurenluz]

I also just had this or a very similar issue trying to donate 0.01 USDC on optimism:

• signed approve, that went through: https://optimistic.etherscan.io/tx/0x3b190b59453890fc31a9e975f8b3208e41fe1df981e0d5ed4ddb6abcd5f4ea43
• Immediately said "donation failed

The error logs said 2 things that might be relevant:
"Wallet does not suport EIP-5782. Falling back the sequential transactions."
"Donation failed: TransactionError: InsuffientAllowance"

[maryjaf]

The error logs said 2 things that might be relevant: "Wallet does not suport EIP-5782. Falling back the sequential transactions." "Donation failed: TransactionError: InsuffientAllowance"

Thanks @laurenluz yeah for this error on op
I’ve created an issue

#204