Here is a description of [multi-calls](https://www.newton.so/view/63761e63e41c0083c0f346ee#answer-6377beaa996bacadb518b50e).

Multi-calls can help reduce the amount communication required with the network, and also give the caller unique ways of invoking multiple contracts in one block(e.g. flash loans).

What are multi-calls in Account Abstraction? What will it bring to the UX?

Newton

Hello! I was wondering whether it was possible to check if a certain address has code in Cairo.
In Solidity, we do something like:

```
assembly {
  codeSize := extcodesize(contractAddress)
}
or just:
uint256 codeSize = contractAddress.code;
```
I was wondering if there was a way to check something like this in cairo? I checked the syscalls file but didn't find anything promising there.

Thank you in advance!

How to check if a contract has been deployed at a certain address in cairo?

hey guys - is there a cheatsheet somewhere will all the most usefull commands? Check logs, check latest version etc?

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

Is there a cheatsheet somewhere will all the most usefull commands

does anyone know how to import an account to ArgentX by private key?

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

Does anyone know how to import an account to ArgentX by private key?

Hello guys, does one know how to modify keccak.cairo and/or packed_keccak.cairo to compute a 512bits keccak hash instead of 256 bits?

I'm following a paper that needs 256 bits collision resistance so i need 512 bit keccak. 

There should only a few parameters to change but its quite hard to find them in the Cairo code 

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

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How to modify keccak.cairo and/or packed_keccak.cairo to compute a 512bits keccak hash instead of 256 bits?


Hi ! Is there something going on the testnet? The block time remains the same, but I have to wait several dozen minutes for my transactions to be accepted

And so, most of the time, the gas price changes a lot between the moment I send the transaction, and its execution, thus I'm getting the `Actual fee exceeded max fee` error quite often

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

Is there something going on the testnet StarkNet?

How do I interact with my Pathfinder node?

How to transpile multiple contracts at once using [Nethermind's warp](https://github.com/NethermindEth/warp)?

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What are multi-calls in Account Abstraction? What will it bring to the UX?

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