Pathfinder initially sends many queries to the Ethereum endpoint, but once it is in sync this lessens and can become so low that Alchemies dashboard shows it as zero requests. This is normal behaviour and is not a cause for alarm.

As a sanity check, the Alchemy dashboard underneath it should show some active recent requests (at least one every 15 minutes or so).



My Alchemy dashboard usage is low?

Hey, I want to concatenate two arrays with known sizes in Cairo lang.
Is there any simple way how to do it? Can you share some of your code?

Is there any simple way to concat two arrays with known sizes in Cairo?

Why should I run a Pathfinder node?

What will the bundler ecosystem look like in AA?

---

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What will the bundler ecosystem look like in Account Abstraction?

I'm implementing the new version and had a couple Q's:

- Is `useStarknetExecute` now the only transaction method (for multi and single calls).
- Do we update the transaction manager on our end? I seem to remember `useStarknetInvoke` also update this automatically

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

Questions about useStarknetExecute. Do we update the transaction manager on our end? [StarkNet/Cairo]

I have the following code:


`from starkware.cairo.common.uint256 import Uint256`


`﻿`


`func main():`


 `test()`


 `return()`


`end`


`﻿`


`func test() -> (res : felt):`


 `alloc_locals`



 `local a : Uint256 = Uint256(low=1, high=0)`


 `if 1 == 1:`


 `local a : Uint256 = Uint256(low=2, high=0)`


 `end`



 `return (res = a)`


`end`


`﻿`


But I keep getting Error: code:20:19: Reference 'a' was revoked.


 return (res = a)


 ^


What is a good pattern for solving this issue?


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/855)_

Cairo: How to reassign Uint256 in a conditional

Please make the function return the floor of the value so we are returned a felt


Test 1


Input(s): 4


Output(s): 2


Test 2


Input(s): 16


Output(s): 4


Test 3


Input(s): 127


Output(s): 6


Test 4


Input(s): 1099511600000


Output(s): 39


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/974)_

How do I write a log based 2 function in Cairo?

Hey folks, do you know how I could read a felt* from ap?

I want to do something like this:

```rs
    let (hello : felt*) = alloc();
    tempvar world : felt* = hello;
    let world_like : felt* = [ap-1];
```

when I do tempvar world = hello, I ensure I add hello (the pointer) to [ap] and then I increase ap so world_like = [ap-1] should be the same thing than world

But I get this error:

```
Cannot assign an expression of type 'felt' to a reference of type 'felt*'.
    let world_like : felt* = [ap-1];
```

When doing a similar code:

```rust
        let (func_pc: felt*) = get_label_location(storage_var);
        _prepare_call(pedersen_ptr, range_check_ptr, len_inputs, inputs + len_inputs);
        call abs ap[11 - 6 * 2];
```

I get ```
Cannot apply subscript-operator to non-pointer, non-tuple type 'felt'.
        call abs ap[11 - 6 * 2];  // removing alloc_locals by calling ap[11-6*2] ?
```

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

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