Error message: Transaction is expected to fail#
This error can appear while swapping on CenturionDEX. It is meant to prevent you from paying the network cost for a swap that would fail.
A few reasons it may appear:
- A variable token buy or sell fee. The swap's slippage must be higher than the token's fee; if the fee rises, increase your slippage. See How to find a token's fee. For example, if the token has a 10% sell fee, try a slippage of 11–14%.
- An unsellable token. Malicious creators can add code preventing anyone but themselves from swapping. See Unsellable-token scams.
- A non-standard approval function. Try revoking existing approvals for the token, then swap again.
- A token causing a mathematical error. Rebase and fee-on-transfer tokens have internal math that changes a swap's output. Try swapping an even or exact input or output amount.