# Pass an arbitrary call data cross-chain through deBridge

This instruction shows how to send a message/call_data through deBridge protocol to perform a simple cross-chain swap into Kovan blockchain using Uniswap liquidity pool

### Create liquidity pool in Kovan network:

Bridge some asset (e.g. BNB) from BSC to Kovan through https://testnet.debridge.finance/ in order to receive wrapped asset (deWBNB) in Kovan network

Create liqudity pool at Uniswap for deWBNB/ETH pair in Kovan:


### Prepare call_data for the swap

Open regular swap widget and increase slippage tolerance parameter to make sure your transaction will not be reverted
https://app.uniswap.org/#/swap


Select deAsset pair where liquidity was added and specify amount to be swapped


Click **Swap** button and open transaction data in Metamask window that popped up


Copy Uniswap router address and transaction data.

You can also form transaction data manually based on the method of Uniswap contract:

> swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)

**deBrige UI**
Go to https://testswap.debridge.finance/ (version of deBridge UI for developers that also allows passing call_data)

Put in the following data:
- Network from: **BSC**
- Network to: **Kovan**
- Asset to be sent: **BNB**
- Fill in amount to be bridged so that **received amount** exceeds the amount from the formed Uniswap transaction
- Enable Bridge & Transfer option
- Specify Uniswap Router address and call_data that was formed before


Press confirm transfer and sign transaction


You can track status of your cross-chain transaction in [deBridge explorer](https://explorer.debridge.finance/). **Call data** field of transaction reflects passed transaction data that will be executed in the target chain.


Keeper will claim and execute your transaction in the target chain if specified execution fee covers execution gas costs. Once tx executed you can also find it in Etherscan

Example: https://kovan.etherscan.io/tx/0x8a79c7dec4998090c21d911077c46f9ef0181d775a310804a3c80311e5e28626


Feel free to reach out to deBridge team in case you will have any problems