Quicknode alerts works for token activity also?

[akshaysoam8]

Hi team

I was checking out the quick alerts feature of Quicknode and tried it for USDC token on ETH mainnet (especially for receiver events).

I was receiving alerts for ETH deposits but not for tokens on ERC chain (like USDC).

Am I doing something wrongly ?

[sahil]

Hi @akshaysoam8,

Yes, you can track USDC deposits for a specific address using the below expression.

(tx_logs_address == '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48' && tx_logs_topic0 == '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef' && tx_logs_topic2 =~ 'ADDRESS_OF_RECEIVER_WITHOUT_0x')

In the above expression, we track three things to get the USDC deposit for a specific address.

1. The USDC Ethereum Mainnet contract address 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 in tx_logs_address.

2. The Transfer event of the smart contract, tx_logs_topic0 takes the hashed function signature of the Transfer event.

Function signature `Transfer(address,address,uint256)` 
⬇
Hashed function Signature `ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef`
⬇
Prefixed with 0x `0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef`

3. This will be the receiver’s address; tx_logs_topic2 takes the receiver’s address. There are a few things to note here; since the log topics are in 32 byte format and the Ethereum address is 20 byte we’ll have to use a regex comparator =~ to check for strings matching our address.
   We will have to replace ADDRESS_OF_RECEIVER_WITHOUT_0x with the receiver’s address without the 0x prefix, to check for 0xDAFEA492D9c6733ae3d56b7Ed1ADB60692c98Bc5 receiver address we’ll have to check for DAFEA492D9c6733ae3d56b7Ed1ADB60692c98Bc5

[akshaysoam8]

Thanks @sahil

I will try this out and then share the feedback.

[akshaysoam8]

Hi @sahil

What you had suggested, it had worked.

We are doing a POC with quicknode alerts functionality.

But if there are two txns from same block number, then it’s missing one event.
In total 4 deposits were done on this address and we were notified 3 times.

Following are the txns coming from same block number:

Txn 1: Amount 0.5 USDC
Txn 2: Amount 1 USDC

Screenshot of our quicknode dashboard, where we received 3 events. Block number 18393273 came only once.

[sahil]

Hey Akshay,

So for the transactions where they were in the same block, did you check that payload? it should have both transactions in the same payload.

[akshaysoam8]

Thanks @sahil

We forgot to check the full payload. Thanks it had worked.

[sahil]

thanks for confirming @akshaysoam8

[orig2g]

Seems to be working properly for me!