Interacting with a smart contract

Prerequisites

Ensure Starkli and Scarb are installed correctly

Ensure that the below commands are working properly on your system.

starkli --version
scarb --version

If either of the above commands fail, see Setting up your environment.

Introduction

Starkli enables interaction with smart contracts via two primary methods:

call for read-only functions.
invoke for write functions that modify the state.

Calling a function

The call command allows querying a smart contract function without sending a transaction.

As an example you can use the get_owner function which doesn’t expect any arguments and returns the address of the current owner:

starkli call \
    0x014825acb37c36563d3b96c450afe363d2fdfa3cfbd618b323f95b68b55ebf7e \
    get_owner --network=sepolia

This will return the address that we passed to the constructor during deployment:

[
    "0x02cdab749380950e7a7c0deff5ea8edd716feb3a2952add4e5659655077b8510"
]

Invoking a function

To modify the state of the smart contract, use the invoke command. Unlike the call command, invoke submits a transaction to the network.

In this example, we’ll invoke the transfer_ownership function to transfer the ownership from our deployer address to a different smart wallet address:

starkli invoke \
    0x014825acb37c36563d3b96c450afe363d2fdfa3cfbd618b323f95b68b55ebf7e \
    transfer_ownership \
    0x011088d3cbe4289bc6750ee3a9cf35e52f4fa4e0ac9f42fb0b62e983139e135a \
    --network=sepolia

After the transaction is accepted on L2, you can confirm the state transition by calling the get_owner function again:

starkli call \
    0x014825acb37c36563d3b96c450afe363d2fdfa3cfbd618b323f95b68b55ebf7e \
    get_owner \
    --network=sepolia

The get_owner function now returns the new owner address, confirming the successful ownership transfer.