> For the complete documentation index, see [llms.txt](https://dexx.gitbook.io/dexx-tutorial-book/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dexx.gitbook.io/dexx-tutorial-book/q-and-a/tokens-with-special-rules.md).

# Tokens with Special Rules

* Buy or Sell Limits Some tokens impose restrictions on the number of buy or sell transactions allowed within the same block.
* Blacklist Smart contracts can prevent specific addresses from transferring or selling tokens.
* Transaction Tax Certain token projects charge a transaction tax on each trade, which can be used for various purposes such as burning (destroying tokens), rewarding holders, providing liquidity, or supporting project development. There’s no maximum limit on these taxes; some tokens may set their tax rates very high to maintain liquidity.
* Decimal Restrictions Some tokens only allow purchases or sales in whole numbers or limit the number of decimal places.
* Balance Modification Certain tokens can directly alter a user’s token balance through the contract code.

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These are just a few examples of common special rules.With the rapid evolution of blockchain technology, new rules are constantly appearing. Please take the time to carefully assess the risks before investing. DEXX is not responsible for any losses resulting from these special rules.


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