Two transactions sit behind many Arbitrum swaps: the token approval, then the swap itself. I learned this after watching the first one confirm and assuming the trade was done. It was not. I had approved the token, but never checked the second transaction.
That is the easy mistake. The expensive one is approving the wrong token or using the wrong network before you notice.
My short path now
I start with the wallet, not the swap box. The network must say Arbitrum One. If it says Ethereum mainnet, another Arbitrum network, or nothing clear, I stop there. A familiar token name is not enough either. Scam tokens can copy a symbol and logo. I compare the contract address with the project’s own source before touching “Approve.”
- Connect the wallet and confirm the network.
- Check both token contract addresses, not just their names.
- Enter the amount and read the estimated output.
- Set slippage only as high as the trade needs. I do not use a huge default just to force it through.
- Approve the exact token amount when the wallet gives that option.
- Wait for approval to confirm. Then submit the swap as a separate action.
- Read the wallet confirmation again: token in, token out, recipient contract, gas.
The fourth step caught my second bad habit. When a swap failed, I used to raise slippage immediately. Sometimes that solved a price-movement problem. Sometimes it only hid a bad route or a stale quote. A failed transaction is information. I check the token, pool route, gas balance, and current quote before changing the tolerance.
I also leave a small amount of ETH on Arbitrum for gas. The swap token cannot pay that fee unless the setup specifically supports it. If the wallet shows no ETH, the trade can be perfectly configured and still stop before submission.
For a final check, I compare the expected output with the minimum received. Those are different numbers. The first is the quote. The second is the boundary that protects the transaction if the price moves while it is being confirmed.
When I want one place to inspect the route before deciding, I keep this arbitrum swap reference open. I still verify the wallet prompt myself. The page is a starting point for the route, not a substitute for checking what the transaction actually requests.
That habit removed the panic from swapping. Approval is not completion. A token symbol is not proof. And a green quote is not a reason to skip the confirmation screen.