# Bridge

### **What is Optopia Bridge?**

Optopia Bridge is a tool that helps you transfer tokens between different networks. You can use Optopia Bridge to send ETH and OPAI tokens from mainnet or testnets Optopia.

Bridge URL: <https://bridge-testnet.optopia.ai/>

### **How much does it cost to bridge?**

Bridging tokens and coins require paying fees and there is the defined minimal L2 Gas limit, which may increase the defined by user Gas value.

### How long does it take to transfer from Ethereum mainnet to Optopia?

The transfer from Ethereum to Optopia typically only requires a few minutes.

### How long does it take to transfer from Optopia to Ethereum mainnet?

It takes about 14 days to transfer from Optopia to Ethereum. This duration is implemented as a security measure to enhance the security of Optopia.

{% hint style="info" %}
For more details about deposit and withdrawal, you can refer to the official documentation of Optimism for these two parts:

<https://docs.optimism.io/stack/protocol/deposit-flow>

<https://docs.optimism.io/stack/protocol/withdrawal-flow>

<https://blog.oplabs.co/two-step-withdrawals>
{% endhint %}

## How to withdraw from Optopia <a href="#how-to-withdraw-from-blast" id="how-to-withdraw-from-blast"></a>

Withdrawals from Optopia require multiple steps. The process is similar to withdrawing from Optimism. Withdrawals take approximately 7 days to complete.&#x20;


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