Function mint 

pub fn mint<T: Config>(
    internal_asset: T::AssetId,
    external_asset: T::AssetId,
    external_amount: <<T as Config>::Fungibles as FungiblesInspect<<T as Config>::AccountId>>::Balance,
    max_fee: Permill,
)

Swap external asset for internal on a specific PSM instance.

Dispatch Origin

Must be Signed by the user performing the swap.

Details

Transfers external_amount of external_asset from the caller to the internal_asset’s PSM reserve account, then mints internal_asset to the caller minus the minting fee. The fee is calculated using ceiling rounding (mul_ceil), ensuring the protocol never undercharges. The fee is transferred to PsmInfo::fee_destination of the targeted instance.

Parameters

• internal_asset: The internal stablecoin that identifies the PSM instance.
• external_asset: The external asset to deposit (must be approved on internal_asset).
• external_amount: Amount of external asset to deposit.
• max_fee: Maximum minting fee rate accepted by the caller.

Errors

• Error::PsmNotFound: If no PSM is registered for internal_asset.
• Error::UnsupportedAsset: If external_asset is not approved on this PSM.
• Error::MintingStopped: If the per-external circuit breaker is at MintingDisabled or higher.
• Error::BelowMinimumSwap: If the internal-equivalent of external_amount is below the instance’s min_swap_amount.
• Error::FeeTooHigh: If the configured minting fee exceeds max_fee.
• Error::ExceedsMaxPsmDebt: If minting would exceed this PSM’s debt ceiling (aggregate or per-asset).
• Error::DecimalsMismatch: If live decimals diverged from the snapshot taken at registration.
• Error::AmountTooSmallAfterConversion: If the conversion to the counter-asset rounds to zero; swap would transfer nothing.

Events

• Event::Minted: Emitted on successful mint.

Warning: Doc-Only

This function is an automatically generated, and is doc-only, uncallable stub. See the real version in Pallet::mint.