> For the complete documentation index, see [llms.txt](https://sosovalue.gitbook.io/sosovalue-indices/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sosovalue.gitbook.io/sosovalue-indices/tutorial/tutorial-guidance-on-usdc-and-gas-fee-eth.md).

# Tutorial Guidance on USDC and Gas fee(ETH)

## Overview

If you are having trouble purchasing our SSI tokens, please refer to this document, which addresses common issues you may encounter.

**You must have USDC in your Base Mainnet wallet to be able to purchase SSI tokens.**

**You must have ETH in your Base Mainnet wallet to cover gas fees.**

## **How to get USDC on Base Mainnet to purchase SSI tokens**

### **USDC Cross-Network Transfer (via DEX)**

1. Use tools such as Uniswap to connect wallets.
2. Select your current USDC-holding network and set Base Mainnet as the destination network.
3. Enter the amount of USDC to transfer.
4. Complete the process.

{% embed url="<https://youtu.be/E2tWKdCHfzg>" %}

### **Transferring USDC from a CEX to an On-Chain Wallet**

1. Select **Withdraw** on the exchange platform.
2. Copy your Base Mainnet on-chain wallet address into the designated wallet address field.
3. Choose **Base Mainnet** as the chain type.
4. Specify the amount of USDC to withdraw and complete the verification process.

{% embed url="<https://youtu.be/JZyKjEgcrjc>" %}

### Converting USDC from Other Coins (on a CEX)

1. Select **Convert** on the exchange platform.
2. Choose your current holding coins and select **USDC** as the target currency.
3. Enter the amount of your current coins to be converted.
4. Complete the process.

{% embed url="<https://youtu.be/3gDZO9ggccc>" %}

## **How to get ETH on Base Mainnet to cover gas fee**

### **ETH Cross-Network Transfer (via DEX):**

1. Use tools such as Uniswap to connect wallets.
2. Select your current ETH-holding network and set Base Mainnet as the destination network.
3. Enter the amount of ETH to transfer.
4. Complete the process.

{% embed url="<https://youtu.be/osPMVSA7vh4>" %}

### **Transferring ETH from a CEX to an On-Chain Wallet:**

1. Select **Withdraw** on the exchange platform.
2. Copy your Base Mainnet on-chain wallet address into the designated wallet address field.
3. Choose **Base Mainnet** as the chain type.
4. Specify the amount of ETH to withdraw and complete the verification process.

{% embed url="<https://youtu.be/LQkZw2r3X1M>" %}