> For the complete documentation index, see [llms.txt](https://docs.o3.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.o3.app/guides/swap/how-do-i-cross-chain-in-o3-cross-chain-wallet.md).

# How do I cross chain in O3 cross-chain wallet?

Before you start, please make sure your O3 cross-chain wallet is updated to the latest version (1.2.0).

Go to the wallet and find  \[Swap].

#### Step 1: Select the source chain, cross-chain assets, enter the number of assets, and select the wallet address.

![](https://3168938119-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FxbcwpDBZrmN41rFPXA2A%2Fuploads%2FMZSZ5tnThpkUxaE0LgKW%2F%E5%BE%AE%E4%BF%A1%E6%88%AA%E5%9B%BE_20220621183833.png?alt=media\&token=c3d275e5-ed21-4f08-aaef-c036fbc9db86)

{% hint style="info" %}
If you don't want to enter the quantity of cross-chain assets manually, you can choose from the quantity ratio menu provided at the bottom of the page.
{% endhint %}

#### Step 2: Select the target chain, the assets to be crossed, and the receiving address.

{% hint style="info" %}
O3 cross-chain wallet supports cross-chain exchange with ***different addresses*****,** i.e. the outgoing address and the receiving address can be different. So remember to backup the private keys of all addresses.
{% endhint %}

#### Step 3: Click \[RFQ] and double check the cross-chain information in the detail page. Click \[Confirm] after confirming it is correct.

![](https://3168938119-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FxbcwpDBZrmN41rFPXA2A%2Fuploads%2FmazPrApRtDWtaRKcM3fX%2F%E5%BE%AE%E4%BF%A1%E5%9B%BE%E7%89%87_20220621183050.png?alt=media\&token=bdecebaa-a778-4256-acd9-815d485dfb02)

If this is the first time your wallet address or token of your choice has engaged in cross-chain activity, you will need to "approve" and then click "confirm".

#### Step 4: Enter your wallet password to start cross chain transaction.

O3 cross-chain wallet ***supports biometric verification***, you can go to \[Detail] - \[Biometric Verification] on the wallet home page to enable Touch ID/ Face ID.

![](https://3168938119-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FxbcwpDBZrmN41rFPXA2A%2Fuploads%2Fs82WK1cf0Z21aZG6TzJR%2F%E5%9B%BE%E7%89%873.png?alt=media\&token=936b7fc1-8f42-4542-87d0-06928d6dacb8)

**Tip:** You will receive two message notifications from O3 cross-chain wallet after you initiate each cross-chain transaction, one notifying the network fee and the other informing the cross-chain success.