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EVM To EVM GMP Example

info

In the following example, we will use the TESTNET environment to pass a generic message from Ethereum Sepolia to Ethereum Goerli. Specifically, the deposit method will be called on Sepolia, passing the details of the function to be called (the store function, or function signature 0xa271ced2) on a smart contract deployed on Goerli "0xdFA5621F95675D37248bAc9e536Aab4D86766663". The method will store the current UNIX timestamp in the destination chain and can be read by calling the retrieve function by querying the depositor address (derived by the private key).

EVM-to-EVM GMP Example​

This is an example script that demonstrates the functionality of the Sygma SDK and the wider Sygma ecosystem of bridges, fee handlers, and relayers. The script showcases a GMP example between two networks using the Sygma SDK. The complete example can be found in this repo.

Prerequisites​

Before running the script, ensure that you have the following:

  • Node.js installed on your machine
  • Yarn (version 3.4.1 or higher)
  • Access to an Ethereum provider
  • Sepolia ETH for gas
danger

We make use of the dotenv module to manage exported private keys with environment variables. Please note that accidentally committing a .env file containing private keys to a wallet with real funds, onto GitHub, could result in the complete loss of your funds. Never expose your private keys.

Getting Started​

  1. Clone the repository

Clone the sygma-sdk repository into a directory of your choice, and then cd into the folder:

git clone git@github.com:sygmaprotocol/sygma-sdk.git
cd sygma-sdk/
  1. Install dependencies

Install the project dependencies by running:

yarn install
  1. Build the SDK

Build the SDK by running the following command:

yarn sdk:build
  1. Usage

To call the function on the destination chain contract, cd into the example folder examples/evm-to-evm-fungible-transfer and run:

cd examples/evm-to-evm-generic-mesage-passing
yarn run transfer

The example will use ethers in conjunction with the sygma-sdk to call a function on a smart contract on Goerli by calling the Deposit method on Sepolia and passing the details of the function to be called.

Replace the placeholder values in the .env file with your own Ethereum wallet private key and provider URL.