Once your provider, contract, and account are connected, you can interact with the contract :

Interact with your contract :

• you can read the memory of the contract, without fees.
• you can write the memory, but you have to pay fees. On Mainnet, you have to pay fees with a bridged ETH token. On Testnet 1 & 2, you have to pay with a bridged Goerli ETH token. On devnet, you have to pay with a dummy ETH token. Your account shall be enough funded to pay fees (0.01 ETH should be enough to start).

Here we will interact with a test.cairo contract, already deployed in Testnet 1 and Tesnet 2, at addresses :

• testnet1 : 0x5f7cd1fd465baff2ba9d2d1501ad0a2eb5337d9a885be319366b5205a414fdd.
• testnet2 : 0x2367db6b0df07033d196dcd25961109d8fbc86227158343149742284c7582e.We will use Testnet1, so you need a funded wallet in this network.

This contract contains a storage memory called balance.

• It can be read with the @view function: get_balance()
• Balance can be modified with the @external function : increase_balance(amount1: felt, amount2: felt)

import { Provider, Contract, Account, ec, json } from "starknet";