Is it possible yet to use mint tokens supporting both transfer fees and confidential transfers?

Question

I can see in the documentation that Token-2022's transfer fees and confidential transfers are supported (or intended to be supported) when used together. However, when I attempt to mint a token with both, like this:

spl-token --program-id TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb create-token --enable-confidential-transfers auto --transfer-fee 50 0

I receive the error message Program log: Mint or account is initialized to an invalid combination of extensions.

Looking at the source code for program-2022, I see that it checks to ensure that the ConfidentialTransferFeeConfig extension is loaded when confidential transfers and transfer fees are used together, but I don't see in the documentation or the CLI code how I could set the config expected at mint.

Am I overlooking something, or is this still incomplete?

Answer 1

You found a bug! We're not automatically initializing the confidential transfer fee extension if the confidential transfer and transfer fee are provided.

If it lands, this will get fixed with https://github.com/solana-labs/solana-program-library/pull/5862, so if you pull from master and create a mint with a transfer fee and confidential transfers, it will properly work, ie:

$ spl-token create-token --transfer-fee 100 1000000 --enable-confidential-transfers auto

Answer 2

It is not yet possible, you can find it here in the future work section: https://spl.solana.com/token-2022/status

"Due to the transaction size limit, it is not possible to do confidential transfers with a fee. We plan to include that capability with Solana 1.18."