Each of the arithmetic operations takes one step in a cairo program. When running the bitwise and, or and xor I found that each of them took nine steps to run.


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_This answer was originally posted on [Triality](https://triality.org/question/1033)_

How expensive are each of the operations in terms of number of steps?


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/1033)_

How expensive are bitwise operations (and/or/xor) vs arithmetic in Cairo?

How to convert tokens on starknet? Any DEXs AMMs?

Something that isn't on testnet.

Am going through all these projects on the ecosystem page but am coming up with nothing.

Would be nice if there was a DEX/AMM section ... instead of making people go through all those projects one by one to see what they actually do.

I'm up to Magnety ...

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

How to convert tokens on starknet? Any DEXs AMMs?


Does AA support "Burner Accounts" so I can connect a new account to a new dApp without worrying about losing all my funds?

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Does Account Abstraction support "Burner Accounts"?

For an array in Cairo, since there is no inherent structure, removing an item from an array means all of the other items after the removed item must be moved, since this is on the blockchain that can be extremely costly. What is the best way to handle this? Should the removed item just be replaced with an empty placeholder? What is the right way to handle this?


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_This question was originally posted on [Triality](https://triality.org/question/224)_

Cairo Array Item Removal

I transferred USDC from Starknet to L1 via Starkgate.
In Starknet Explorer, it shows the assets received on L1, but I have no USDC received on L1. It’s been more than 12 hours. What could be the problem?!

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

Problem with transfering USDC via Starkgate. Can anyone help?


What kind of efficiency gains can one expect from writing the contracts directly in Cairo as opposed to transpiling with warp?

What are the efficiency gains of direct Cairo vs. transpiling with warp?

Hi all,

Am planning on starting a mainnet node and running it in a docker container as per these instructions:
https://github.com/eqlabs/pathfinder/#running-with-docker

My question:
I am already running a full Ethereum node on my server. I this case, can I set the  PATHFINDER_ETHEREUM_API_URL parameter to my node's endpoint, i.e. 127.0.0.1:[eth node rpc port]?

Thx.

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

I am already running a full Ethereum node on my server. Can I set the  PATHFINDER_ETHEREUM_API_URL parameter to my node's endpoint for pathfinder?

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)_

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How expensive are bitwise operations (and/or/xor) vs arithmetic in Cairo?

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