There is a `PENDING` status where you can see the tx on Voyager but it's not yet `ACCEPTED_ON_L2` meaning the block hasn't been created yet. Is that what you are looking for? `PENDING` status is supposed to mean it won't fail (even if I have seen txs fail in specific cases). Also, voyager is usually a bit behind. And rejected transactions don't appear in the block at all for now (should change with Sierra I think).

I experience it on mainnet, yes. See [https://www.cairo-lang.org/docs/hello_starknet/intro.html#interact-with-the-contract](https://www.cairo-lang.org/docs/hello_starknet/intro.html#interact-with-the-contract)

I think I don't experience it on testnet though… Not 100% sure

did you try this? [https://docs.starknet.io/docs/CLI/commands/#starknet-tx_status](https://docs.starknet.io/docs/CLI/commands/#starknet-tx_status) Specify the `--contract` param to see error locations and `--error_message` to focus on the error

(on a failed transaction)

also, please note => [https://docs.starknet.io/docs/Blocks/transaction-life-cycle#the-pending-block](https://www.notion.so/a-plan-to-get-better-visibility-when-a-transaction-got-received-but-not-placed-into-a-block-008e52e8c2cd4fa3a1c0c9c2b5c06cfb) that querying the "PENDING block" becomes obsolete with full nodes. But I think we will still know that the tx is pending

`pending` is available on testnet as well. It is also supported via the RPC API with `BlockID="pending"` kind of parameters, same as "latest".

The latest `pathfinder` caches pending replies locally every 5s (10s?). pending is meant as a bandaid while block times are high (i.e. mostly mainnet)

![img](https://sun9-13.userapi.com/impg/9YrwMdCKAVbgBRKmMdGysFrP3qhbHWBiTNgp3A/64s3EVNAEpE.jpg?size=1158x874&quality=96&sign=f55c859f079b65212bc744b47e7bb7af&type=album)
Is there a plan to get better visibility when a transaction got received but not placed into a block?
For the moment we only know that it is RECEIVED but have no clue if it’s been discarded because of missing constructor params or if it’s just late:

```python
{
	transaction_hash: '0x3d26af3d7a8f17ea28c2a71a250fd8c5dcd162b779051fd36a3bfcd9f130fab',
	actual_fee: undefined,
	status: 'RECEIVED',
	status_data: undefined,
	messages_sent: [],
	events: [],
	l1_origin_message: undefined
}
```

upd: I noticed we are notified when we make an error, but:

1. we don’t know what’s happening between `RECEIVED` and `REJECTED | ACCEPTED_ON_L2`, it’d be nice to be able to monitor a bit more preceisely where’s the transaction in the pipeline

2. the error message is often cryptic and not human readable, ex:

```python
Error: REJECTED: TRANSACTION_FAILED
Error at pc=0:1073:
An ASSERT_EQ instruction failed: 9:6 != 9:5.
```

Is there a way / tool to be able to debug this kind of failed transactions?

Newton

A plan to get better visibility when a transaction got received but not placed into a block?

Hello! This is day 10 of the 17 days of the Cairo Challenge. And I have no idea how to solve the [playground](https://www.cairo-lang.org/playground/) exercise “Bitwise operations”.  Perhaps you can help me?

```
// The bitwise builtin allows you to perform bitwise operations
// (and, or, xor) on integers up to 251 bits.
//
// The following code implements the function xor_last_hex_digits,
// which takes the two last hexadecimal digits and "xor"s them.
// For example, in 0x1234 the last two digits are 3 and 4,
// and their xor is 3^4=7.
//
// Fix the missing code and make sure it works.

%builtins bitwise

from starkware.cairo.common.bitwise import bitwise_and, bitwise_xor
from starkware.cairo.common.cairo_builtins import BitwiseBuiltin

// Returns the xor of the last two hexadecimal digits.
func xor_last_hex_digits{bitwise_ptr: BitwiseBuiltin*}(x: felt) -> (res: felt) {
    // Fix and uncomment the line below.
    // let (digit0) = ...

    let (shifted_digit1) = bitwise_and(x, 0xF0);
    tempvar digit1 = shifted_digit1 / 0x10;

    return bitwise_xor(digit0, digit1);
}

func main{bitwise_ptr: BitwiseBuiltin*}() {
    let (res) = xor_last_hex_digits(0x1234);
    assert res = 7;

    return ();
}
```

---

> Answers to this question are a part of the ✨ 17 days of Cairo Lang with Playground & Newton. ✨
> 

*Vote for your favorite answer - the best answer will win a $10 award. A new day – a new reward! During the next 17 days, our goal is to attract more developers to the Cairo language and to systematize the knowledge of Cairo lang. [Read rules](https://www.notion.so/17-days-of-Cairo-Lang-with-Newton-550dfcda6a2d449ca468be293c776578)*

How to make Bitwise operations in Cairo Lang using %builtins bitwise, bitwise_xor?

Hi everyone,

When i try to invoke my functions with arguments from my frontend app using starknetjs, i get error invalid character, which i presume is an issue from my function accepting felt, but i'm passing texts. Is there any way to convert to felts from the browser or does starknetjs do this by default?

Anyone knows how i can solve the error?

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

How to fix invalid character error while invoking starknetjs frontend app in Cairo?

hi, i used the starkgate bridge from stark to eth one hour ago. Withdrawal has not occurred yet. How many hours does the process take? My tx hash is: <address>cfa0c02d013658804505506

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

How long does starkgate bridge process?

There are a bunch of questions about key storage in a new "Account Abstraction" paradigm.
1. Can I recover my key if I lose it?
2. Can I have a key-less wallet?
3. Can I easily create new wallets like in Metamask "Add Account" with only 1 seed phrase?
---

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How will work an account abstaction wallet with the key?

Hey! I have a contract deployed on Testnet. Let's say its address is `0x1234`.

I want to get its ABI somehow, but I don't have the code of the contract, because it wasn't deployed by me.

I'm using StarkNet.py to interact with StarkNet.

Does anyone know the answer?

How to get the contract ABI using Starknet.Py?

Hello! This is day 9 of the 17 days of the Cairo Challenge. And I have no idea how to solve the [playground](https://www.cairo-lang.org/playground/) exercise “Field Elements 2”.  Perhaps you can help me?

```
// As you saw in the previous challenge, the operator '/' does not denote
// truncated (i.e., rounding down) integer division as in other programming
// languages. Instead, one can use library functions such as
// unsigned_div_rem().
//
// Note that unsigned_div_rem() does not work for negative numbers.

%builtins output range_check

// Import unsigned_div_rem() from the math module.
from starkware.cairo.common.math import unsigned_div_rem
from starkware.cairo.common.serialize import serialize_word

func main{output_ptr: felt*, range_check_ptr}() {
    let (q, r) = unsigned_div_rem(value=12, div=3);
    // Output the quotient (12 // 3).
    serialize_word(q);
    // Output the remainder (12 % 3).
    serialize_word(r);

    // Add code that outputs the quotient and remainder of 13 / 3 in addition to 12 / 3 here.

    return ();
}
```

---

> Answers to this question are a part of the ✨ 17 days of Cairo Lang with Playground & Newton. ✨
> 

*Vote for your favorite answer - the best answer will win a $10 award. A new day – a new reward! During the next 17 days, our goal is to attract more developers to the Cairo language and to systematize the knowledge of Cairo lang. [Read rules](https://www.notion.so/17-days-of-Cairo-Lang-with-Newton-550dfcda6a2d449ca468be293c776578)*

How to divide felt in Cairo Lang using unsigned_div_rem?

Does AA work on Mobile?

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A plan to get better visibility when a transaction got received but not placed into a block?

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