> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mpcvault.com/llms.txt
> Use this file to discover all available pages before exploring further.

# TON Wallet

> Understand TON wallet contracts, fees, and the Comment field for exchange deposits.

## How TON Wallets Work

On TON, every wallet is a smart contract. Your first transaction deploys this contract, requiring a small GRAM (prev. TON) payment. MPCVault displays addresses in "UQ" format.

## Transaction Fees

TON fees consist of multiple components:

| Fee Type    | Description                                    |
| ----------- | ---------------------------------------------- |
| Storage     | Cost for storing your wallet contract on-chain |
| Forward     | Fees for sending messages between contracts    |
| Action      | Fee for executing the transaction              |
| Computation | Cost for running contract code                 |

<Note>
  TON fees cannot be customized. MPCVault does not charge additional fees.
</Note>

## Usage Tips

* First transaction costs extra to deploy the wallet contract (one-time)
* Every transaction incurs storage fees
* When sending to exchanges, always include the required **Comment (memo/tag)**

## Comment vs Transaction Notes

| Field             | Visibility              | Purpose                                    |
| ----------------- | ----------------------- | ------------------------------------------ |
| Comment           | Public (on-chain)       | Required by exchanges to identify deposits |
| Transaction Notes | Private (MPCVault only) | Internal tracking for your team            |

<Warning>
  When depositing to an exchange, enter the memo/tag in the **Comment** field, not Transaction Notes. If you forget, contact the exchange support—your funds are safe as long as the address is correct.
</Warning>