It is a wallet built on StarkNet, btw mobile one is built on zkSync. If you want to build a simple web app built with vanilla HTML/CSS/JS, no react, you can find examples showing how to do it in the argent x community for professional support:https://discord.com/invite/GWSyrHg 

_This answer was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Newton

Guys, what`s ArgentX?

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

What is ArgentX?

How do I create OZ (Open Zeppelin) contract using starknetjs?

# Hello starknet fam!

I heard with the last release of protostar it is now possible to make multiple call to different contracts functions in one protostar invoke CLI.

Can someone show me a good exemple on how to use it?

Like multicall with approve and swap.

Thank you very much!

How to use multicall with protostar 0.9.0?

How can I send a Uint256 amount of ERC20 tokens from L1 to starknet?
I have "amount" as a uint256 on L1 but how should I build my payload for "`sendMessageToL2`" to match the Uint256 format of Cairo?

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How can I send a Uint256 amount of ERC20 tokens from L1 to starknet? And how should I build my payload for "sendMessageToL2" to match the Uint256 format of Cairo?

How can I use the meta-class of contract (starknetjs) for interaction?

How can I use meta-class of contract (starknetjs) for interaction?

How can I connect a predeployed StarkNet account in Starknet-devnet using starknetjs. Is there any difference with connect an existing account (in any network)?

How can I connect a StarkNet account using starknetjs?

Hi. I am seeing this error in my tests after upgrade.

```
(starknet-py) JediSwap % protostar test tests/test_deployment.cairo 
17:59:05 [INFO] Collected 1 suite, and 3 test cases (0.062 s)                                                                                                    
[UNEXPECTED_EXCEPTION] tests/test_deployment.cairo                                                                                                               
Traceback (most recent call last):
  File "protostar/commands/test/test_runner.py", line 98, in run_test_suite
  File "protostar/commands/test/test_runner.py", line 155, in _build_execution_state
  File "protostar/commands/test/environments/setup_execution_environment.py", line 38, in execute
  File "protostar/starknet/execution_environment.py", line 32, in perform_execute
  File "starkware/starknet/testing/contract.py", line 293, in execute
  File "starkware/starknet/testing/contract.py", line 303, in _execute_on_given_state
  File "protostar/starknet/cheatable_state.py", line 97, in execute_entry_point_raw
  File "starkware/starknet/testing/state.py", line 241, in add_messages_and_events
  File "starkware/starknet/business_logic/execution/objects.py", line 337, in get_sorted_events
IndexError: list assignment index out of range
```

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

StarkNet error while deploying: IndexError: list assignment index out of range. Can anyone help?

How do I access the address 0, ie 0x0 in Cairo? Like address(0) in solidity


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/656)_

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