# Swan Token 合约

**USDC** token is used to pay node operators for data storage and computing for smart contracts and also for deposits placed by node operators as required by contract creators.

**MATIC** token is used to pay gas fee while locking and unlocking funds through smart contract.

## Polygon Mumbai (MATIC) <a href="#polygon-matic" id="polygon-matic"></a>

### Mumbai Testnet <a href="#mumbai-testnet" id="mumbai-testnet"></a>

{% hint style="info" %}
If you have not set up your MetaMask wallet, please refer to [Beginner Walkthrough](https://docs-cn.filswan.com/multichain.storage/mcp-user-guide/setup-metamask) to set up your MetaMask wallet first.
{% endhint %}

{% hint style="success" %}
**Mumbai Faucet**

Testnet **USDC** and **MATIC** tokens are available from the [Swan USDC faucet](https://calibration-faucet.filswan.com).
{% endhint %}

<table><thead><tr><th width="241.23721958235222">Parameter</th><th>Value</th></tr></thead><tbody><tr><td><code>ETH_CHAIN_ID</code></td><td><code>80001</code></td></tr><tr><td>Token Contract Address</td><td>0xe11a86849d99f524cac3e7a0ec1241828e332c62</td></tr><tr><td>Name </td><td>USDC Token</td></tr><tr><td>Token Symbol</td><td>USDC</td></tr><tr><td>Token Decimals</td><td>18</td></tr></tbody></table>

To find out more information about how to **acquire these Testnet tokens,** please go to [here](https://docs-cn.filswan.com/kai-fa-zi-yuan/swan-token-contract/acquire-testnet-usdc-and-matic-tokens).