0x supports trades for all ERC20 tokens that are aggregated from our aggregated liquidity sources. This also includes Buy / Sell tax tokens. Currently, we support over 9 million tokens in the EVM landscape. 
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The only exceptions to the entire token list are tokens blocked for legal and/or compliance reasons. 
How to query which tokens are available to be swapped through 0x API
Step-by-step guide for querying which tokens are available to be swapped through 0x API.
 Updated over 10 months ago
