> For the complete documentation index, see [llms.txt](https://docs.optopia.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.optopia.ai/tools/bridge.md).

# 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;