▫️Introduction

The easiest experience for creating WebGchain apps (WebGApps) is provided by WebGlide.

Building a WebGApp requires only two straightforward steps:

• Implement Receive in the destination chain contract. This is the function that receives the payload you pass across chains.

• Call call on the origin chain, passing in your payload and relayer fees.

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Important Concepts

Fast Path vs. Slow Path

Review the Transaction Lifecycle for a moment. The terms "fast path" and "slow path" (authenticated) transfers are introduced here. Any cross-chain project has to grasp the distinction. Then test it out using our instructions to authentication.

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Quickstart

Quickstart (Greeter)

This quickstart will show you how to move money and data between chains using the cross-chain communication primitive known as WebGcall.

We will construct a cross-chain Greeter in this tutorial. The updateGreeting function of the DestinationGreeter contract on the destination chain modifies a greeting variable that is saved. For updateGreeting, the SourceGreeter contract on the origin chain utilises WebGcall to provide calldata that has been encoded.

The update shows how to combine an asset transfer with any call in a single WebGcall.Payment is necessary for the greeting feature to update the greeting. In this case, any sum larger than zero is acceptable according to the contract.

There are no security checks to ascertain who is calling the function because updateGreeting is implemented as an unauthenticated call. As a result, this kind of WebGcall will follow the "Fast Path".

Our app-starter package is compatible with Hardhat and Foundry and comes with a complete example of this quickstart (plus more) if you'd rather fork a repo than follow this step-by-step tutorial.