Multichain Value Transfer
This is an example contract that shows how you can send value across chains via the ZetaChain API.
From this rudimentary example, you could easily extend it to support arbitrary asset exchanges via a swap to/from ZETA on source and destination.
Multichain Value Transfer
In this tutorial we will create a contract that allows sending value from one chain to another using the Connector API.
Set up your environment
git clone https://github.com/zeta-chain/template
Install the dependencies:
yarn add --dev @openzeppelin/contracts
Create a new contract
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The contract's main functionality is implemented in the sendValue function.
The send function first checks if the destination chain ID is valid and if the
Zeta value and gas are not zero.
Next, it attempts to approve and transfer the specified amount of Zeta tokens from the sender's address to the contract's address.
Finally, the function calls the "send" function of a connector contract, providing the necessary inputs such as the destination chain ID, destination address, gas limit, and other parameters. The function encodes these inputs into a message and sends it to the connector contract for further processing.
The contract also uses a notion of "available chains". Before calling the send
function and transferring value between chains you need to call the
addAvailableChainId function on the source chain and add the destination chain
ID to the list of available chains. In this example this logic is implemented in
the deploy task.
Create a deployment task
The deploy task is fairly standard. It deploys the contract to two or more
chains and sets the interactors on each chain. Additionally, for this example,
the script also calls the addAvailableChainId function on each chain to add
the other chain to the list of available chains.
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Clear the cache and artifacts, then compile the contract:
npx hardhat compile --force
Run the following command to deploy the contract to two networks:
npx hardhat deploy --networks polygon-mumbai,bsc-testnet
Send a message
Create a new task to send tokens from one chain to another. The task accepts the following parameters: contract address, recipient address, amount, destination chain ID, and the source network name.
Send a message from Polygon Mumbai testnet to BSC testnet (chain ID: 97) using
the contract address (see the output of the deploy task). Make sure to submit
enough native tokens with --amount to pay for the transaction fees.
npx hardhat send --contract 0x042AF09ae20f924Ce18Dc3daBFa1866B114aFa89 --address 0xF5a522092F8E4041F038a6d30131192945478Af0 --amount 20 --destination 97 --network polygon-mumbai
🔑 Using account: 0x2cD3D070aE1BD365909dD859d29F387AA96911e1
✅ The transaction has been broadcasted to polygon-mumbai
📝 Transaction hash: 0x2748882492a565627e4726658744f443fb993943f25ba73f93dba42ae314e689
Please, refer to ZetaChain's explorer for updates on the progress of the cross-chain transaction.
🌍 Explorer: https://explorer.zetachain.com/address/0x042AF09ae20f924Ce18Dc3daBFa1866B114aFa89
Source Code
You can find the source code for the example in this tutorial here:
https://github.com/zeta-chain/example-contracts/blob/feat/import-toolkit/messaging/value