feat: implement eth_get_balance

[enitrat]

Implement the method eth_get_balance of the EthRPC trait

kakarot-ssj/crates/contracts/src/kakarot_core/eth_rpc.cairo

Lines 124 to 126 in b1f7f8c

	fn eth_get_balance(self: @TContractState, address: EthAddress) -> u256 {
	panic!("unimplemented")
	}

Given an evm address, this will return the balance of this address.

Use this where required inside the codebase, e.g.

kakarot-ssj/crates/evm/src/backend/validation.cairo

Lines 52 to 56 in b1f7f8c

	// Validate balance
	let balance = IERC20CamelDispatcher {
	contract_address: kakarot_storage.Kakarot_native_token_address.read()
	}
	.balanceOf(starknet_caller_address);

kakarot-ssj/crates/evm/src/backend/starknet_backend.cairo

Lines 120 to 125 in b1f7f8c

	pub fn fetch_balance(self: @Address) -> u256 {
	let kakarot_state = KakarotCore::unsafe_new_contract_state();
	let native_token_address = kakarot_state.get_native_token();
	let native_token = IERC20CamelDispatcher { contract_address: native_token_address };
	native_token.balanceOf(*self.starknet)
	}

[stevencartavia]

Hi, I would like to work on this!

[onlydustapp]

Hey @stevencartavia!
Thanks for showing interest.
We've created an application for you to contribute to Kakarot zkEVM.
Go check it out on OnlyDust!

[enitrat]

Hi, this will be for the ODHack week

[bitfalt]

I am applying to this issue via OnlyDust platform.

My background and how it can be leveraged

Hii! My name is Daniel, I’m a Computer Science student and web3 developer. I’ve done some contributions, finished a Starknet Bootcamp, exercises on NodeGuardians, finished Starklings and I have participated in multiple Hackathons. I’m also a member of the Dojo Coding community.I’ve contributed to the project in the past.

How I plan on tackling this issue

I would approach this issue in the following way:

• Create the implementation for the eth_get_balance
• Refactor the code to import the EthRPC trait properly (i’ve already done it in the past contribution)
• Refactor the codebase to call eth_get_balance where it is necessary
• I would ask the maintainers if any questions come up during my implementation

[manlikeHB]

I am applying to this issue via OnlyDust platform.

My background and how it can be leveraged

Hi, I am Cairo dev with lots of experience contributing to Cairo projects, my OD profile is a witness to this. This feat is right within my comfort zone.

How I plan on tackling this issue

I would go through the code base and understand the functionality expected, after that I would write a robust test ensuring all test cases are covered and the feat behaves as expected.

[mahesh-dalle]

I am applying to this issue via OnlyDust platform.

My background and how it can be leveraged

I am a cairo developer , and have a thorough understanding of ethereum rpc endpoints

How I plan on tackling this issue

Read the codebase, try to implement the rpc endpoint , use the implementation where its needed.

[JoE11-y]

I am applying to this issue via OnlyDust platform.

My background and how it can be leveraged

With over four years in blockchain and backend development, I’ve worked across different ecosystems, handling everything from smart contract design to on-chain interactions and protocol integration. I focus on building secure, scalable, and reliable blockchain applications, managing both on-chain and off-chain infrastructure.

How I plan on tackling this issue

As this would be my first contribution. I'd start by reviewing Kakarot's architecture, then select the best possible way for implementing the eth_get_rpc. Once completed would proceed to test and integrate with the JSON rpc interface.

[saimeunt]

I am applying to this issue via OnlyDust platform.

My background and how it can be leveraged

I have some experience in Cairo, mostly porting Solidity ERCs to Cairo:
https://github.com/carbonable-labs/cairo-erc-7496
https://github.com/carbonable-labs/cairo-erc-7498

How I plan on tackling this issue

I will leverage kakarot_core address_registry function to map the given EthAddress to the corresponding Starknet ContractAddress, then I will query this address balance on the native_token.
I will search for all occurences in the codebase where accessing the eth balance is needed and refactor using the EthRPC dispatcher.

[onlydustapp]

The maintainer enitrat has assigned saimeunt to this issue via OnlyDust Platform.
Good luck!