8000 Support for additional Token22 extensions by Ikrk · Pull Request #3701 · solana-foundation/anchor · GitHub
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Support for additional Token22 extensions #3701

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Support for additional Token22 extensions #3701

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@Ikrk Ikrk commented May 10, 2025 •
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Hello,
this PR extends the original Token22 Extensions PR #2789 and adds support for additional token mint extensions, namely:

  • transfer fee
  • interest bearing
  • non-transferable
  • default account state

An example of initialization:

const BASIS_POINTS: u16 = 100;
const MAX_FEE: u64 = 10000;
const RATE: i16 = 100;

#[account(
    init,
    ...
    extensions::non_transferable,
    extensions::transfer_fee::config_authority = authority,
    extensions::transfer_fee::withheld_authority = authority,
    extensions::transfer_fee::basis_points = BASIS_POINTS,
    extensions::transfer_fee::max_fee = MAX_FEE,
    extensions::interest_bearing::authority = authority,
    extensions::interest_bearing::rate = RATE,
    extensions::default_account_state::state = AccountState::Frozen,
)]
pub mint: Box<InterfaceAccount<'info, Mint>>,

An example of constraints check:

#[account(
    extensions::non_transferable,
    extensions::transfer_fee::config_authority = authority,
    extensions::transfer_fee::withheld_authority = authority,
    extensions::interest_bearing::authority = authority,
    extensions::default_account_state::state = AccountState::Frozen,
)]
pub mint: Box<InterfaceAccount<'info, Mint>>,

Checking of constraints extensions::transfer_fee::basis_points, extensions::transfer_fee::max_fee and extensions::interest_bearing::rate is currently not supported.

Also I was wondering if it would not be better to have ex. extensions::non_transferable = false instead of only being able to check if the non-transferable extension is enabled?

Fixes #3088.

Let me know what you think. Thanks!

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How to define extensions non_transferable?
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@Ikrk
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