# Fees

* **Chain Execution Fee**
  * This is the cost (charged in IST) for Inter Protocol actions (PSM and Vaults) that involve on-chain JavaScript smart contract interactions.
  * Users accrue a 0.02 IST (approximately) fee for each interaction but it is only charged after it reaches 0.20 IST (i.e. every 10 interactions). This means every 10 interactions, you will be charged 0.20IST.
  * When you first provision a smart wallet - you receive 0.25 IST which covers your first few interactions.
  * Insufficient IST balance to cover this charge manifests itself with the following UI error:
    *  "Offer failed: Error: Broadcasting transaction failed with code 20 (codespace sdk). Log controller refused message admission: 0uist is smaller than 200000 uist: insufficient funds: mempool is full"
  * This fee is subject to BLD staker governance.
* **Stability Fee**
  * This is the annualized cost of debt or APR on your vault-minted IST amount. It is recorded hourly and accrued/charged daily. i.e. the interest you pay on the IST debt you are taking on
  * This fee is subject to [Economic Committee governance](https://community.agoric.com/c/inter-protocol/econ-committee/28) and therefore subject to change (i.e. not fixed) 
* **Minting Fee**
  * Accrued every time you vault-mint IST either when you create a new vault or mint additional IST against that vault
  * This serves to prevent users from minting IST, using it and paying it back before any interest (stability fee) gets charged.
  * This fee is subject to [Economic Committee governance](https://community.agoric.com/c/inter-protocol/econ-committee/28) and therefore subject to change (i.e. not fixed) 
* **Liquidation Penalty**
  * A penalty fee, charged in collateral type of a user's underlying vault, upon liquidation of your vault (when collateralization ratio = liquidation ratio). This fee is transferred to the reserve.
  * This fee is subject to [Economic Committee governance](https://community.agoric.com/c/inter-protocol/econ-committee/28) and therefore subject to change (i.e. not fixed) 


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