Introduction
You can use Omni to call a contract on another chain. We call this an xcall.
omni.xcall(
destChainId, // desintation chain id, e.g. 1 for Ethereum mainnet
to, // contract address on the destination chain
data, // abi encoded calldata, ex abi.encodeWithSignature("foo()")
gasLimit // (optional) gas limit for the call on the destination chain
)
When receiving an xcall, you can read its context through the current xmsg given your contract implements the XApp helper contract.
xmsg.sourceChainId // where this xcall came from
xmsg.sender // who sent it (msg.sender of the source xcall)
omni is a reference to the OmniPortal contract. One portal is deployed on each supported chain. To make interacting with the portal easier, inherit from the XApp contract.
Omni is a cross-chain messaging protocol that allows contracts to send and receive messages across different chains. It is a simple and secure way to interact with contracts on other chains.
However, Omni is not a bridge for canonical or native tokens. If you need to move assets between chains, you will need to implement your own bridge (with a transfer token proxy and liquidity for source and destination rollups) or use an existing bridge.