When trying to swap certain tokens, you may experience an issue where the ‘Swap’ button greys out and does not trigger your wallet when you click it. Or perhaps you'll receive the message above, "Unexpected issue with estimating the gas. Please try again." If you find yourself unable to sell a token, you should first check to see if there is a sell tax on it.
If there is, you will need to increase slippage accordingly to accomodate for the tax. If the token you are selling has a 7% fee for example, you’ll want to use at least 8% at least which will also include DEX fees and price impact.
This also applies to removing liquidity. If a tax is levied upon removal, use the 1.0 UI to withdraw and increase slippage.
If you are still not able to swap out of your token, then take a moment to check the legitimacy of it. Is it a copycat coin of something else? If you search the address of it on a block explorer for the chain you're on (for example https://arbiscan.io/) you can inspect the contract. A sure sign is if the contract name is generic, particularly in our experience something like MOON, COIN, CoinToken, iGOLD, KING, and has nothing to do with the actual token. Search through the contract a bit, if you see a function by the label of killself() or selfdestruct(), or a piece of coding that disables trading without a granted role or whitelisting, that’s another sure sign of a scam.
Besides this, you’ll also would to do your due diligence in checking the website, socials, and documentation of your token – whether these exist or not, it is a good indication of legitimacy. When monitoring the buys and sells of it on an application like DexTools or DexScreener keep an eye on sells. If you see hyper inflated price growth where only one or two addresses selling while all others are buying, you'll know it's suspicious.
Look at the history of the token on the block explorer. How old is it? The market cap might be unrealistically large for being a fresh creation. Was it randomly airdropped into a large number of wallets on creation to give the illusion that it has many holders? Things like this are crucial to investigate before buying a unlisted token.
There are a number of tools online which can scan token contracts in advance to give safety reports on them, however scammers are getting craftier every single day in their methods of manuvering around detection. If you decide to gamble with an unlisted token - be careful.
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