Your First Smart Contract

• You can find the chain details on the EVM Developers page

• You can find an example of a simple Counter contract and deployment instructions within the injective-foundry-example.

• You can also read our general-purpose Testnet Deployment guides.

Building and Deploying smart contracts on Injective should be quite simple. As your first example, we'll take a look at a simple Counter smart contract example.

1. We'll develop the smart contract,

2. Do a Testnet Deployment on the Injective's EVM Testnet,

3. Query the smart contract using Cast,

4. Send a transaction to change the smart contract state using Cast,

Requirements

You can request EVM testnet funds from the official Testnet faucet here.

1. The guide uses foundry for deployments. Install it by running:

curl -L https://foundry.paradigm.xyz | bash

To verify the installation:

forge --version

1. Add Injective EVM to your foundry.toml

[rpc_endpoints]
injectiveEvm = "https://k8s.testnet.json-rpc.injective.network/"

Development

We can build a simple Counter example and then do a transaction/query the smart contract state.

Smart Contract Code

This is just a simple Counter smart contract written in Solidity.

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.27;

contract Counter {
    uint256 public number;

    event ValueSet(address indexed sender, uint256 newValue);
    event UserRevert(address indexed sender, string reason);

    function setNumber(uint256 newNumber) public {
        number = newNumber;
        emit ValueSet(msg.sender, number);
    }

    function increment() public {
        number++;
        emit ValueSet(msg.sender, number);
    }

    function userRevert(string memory reason) public {
        emit UserRevert(msg.sender, reason);
        revert("user requested a revert; see event for details");
    }
}

Deployment

You can read more about the process of Testnet Deployment in the page referenced in the link.

Querying the Smart Contract

Using Injective

// WiP

Using Casttive

Let's query the smart contract state using Cast

cast sig "function number() returns (uint256)" 0x8381f58a

cast call --rpc-url injectiveEvm {SmartContractAddress} 0x8381f58a

Transactions against the Smart Contract

Using Injective

// WiP

Using Cast

Let's make a transaction and change the smart contract state using Cast

cast sig "function increment()" 0xd09de08a

cast send --legacy --rpc-url injectiveEvm --private-key {YourPrivateKey} {SmartContractAddress} 0xd09de08a

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