The easiest way to lose money on zkSync is to choose a token by its ticker symbol and assume you have the right asset. The mistake usually happens once: the swap looks normal, the amount is small enough to approve quickly, and only afterward do you notice that the token came from a different contract or bridge. The transaction may be cheap, but the recovery cost can be much larger than the fee—sometimes the funds are effectively unrecoverable, and sorting out what happened can take an evening.
This is why the first question in a zkSync swap should not be “What is the exchange rate?” It should be “Which exact token am I holding, and which exact token am I receiving?” Two assets can display similar names while behaving as completely different tokens. A wallet balance, a familiar logo, or a matching ticker is not enough evidence. The contract address is the useful detail.
Check the asset before checking the price
Before approving anything, compare the token’s contract address with the address supplied by the person, application, or documentation you trust. Check that the network is zkSync, check the number of decimals if the amount looks strange, and make sure the destination asset is the one you actually intend to use afterward. A ten-second pause here is worth more than trying to save a few cents in fees.
There is a second version of the same mistake: using the correct token but accepting a poor route because the first quoted result looks convenient. This is less catastrophic, but it can still turn a $500 trade into a $485 one once price impact and slippage are included. That difference is money, not merely a technical detail. For a small test swap, I would rather spend a little more and confirm the result than optimize a route I have not yet used.
So the sensible order is: identify the contract, confirm the network, inspect the expected output, then approve only the amount required. If the wallet asks for an unlimited allowance, stop and change it when a smaller approval is available. The goal is not to eliminate every risk; it is to avoid making an irreversible choice before you know what you are authorizing.
Once those checks are clear, the practical part of a zksync swap starts here: syncswap.dev. I would have the token address copied and the amount decided before opening it, because that removes the two rushed decisions most likely to cause the mistake.