Filter swaps in response body

Moralis General
#1

I created a stream to listen to a list of non-smart-contract addresses on all the EVM chains. I want somehow in the code determine what event happened. Is it a swap or just a transfer. I am struggling with swaps so much, becaause I dont know how to filter them out from just transfers. I need to know that wallet I am listening events from swapped tokens or transferred them or received them. Can someone help with it?

#2

Hi @cryptone3d

Can you please share more details on which endpoint you are currelty using to get the transfer and swap data?

#3

Hey @johnversus
I am not using an endpoint, I just exposed a webhook where response data posted from moralis it is basically this https://docs.moralis.io/streams-api/evm/response-body

#4

Ahh I see. In that case you can use the topic0 hash from the streams body to identify the transfer, swap event. Each event will have a unique topic0 hash which you can hard code in your code for comparison.

#5

Hm, I saw the logs, but it looks like there is always transfer, maybe I am warong have to check that, I made a swap on polygon network and I see several logs and it seems like it it a Trasnfer, because I see in the logs this hash 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef

#6

I believe every swap transaction will include the token transfer event as well as one will be followed by other.

#7

I found one, in the logs I see transfer and swap, I think I have to go through all of the logs and if see a Swap signature I may assume that swap happened, am I correct on this? And one more question, would swap signature differ from chain to chain or swap router?

#8

By swap signature if you mean swap token0 hash then yes you can use it.
It will be same on all chains but they can be be different with swap contracts / router.

#9

what do you mean by token0? I’ve seen this one when I made swap on polygon network Swap(string,address) 0xbeee1e6e7fe307ddcf84b0a16137a4430ad5e2480fc4f4a8e250ab56ccd7630d

#10

sry I meant to say topic0 hash.
Example for topic0 hash of transfer event:

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image2606×374 72.9 KB

#11

I see, I found this one in the logs Swap(string,address) is it gonna be different if I swap on metamask router or uniswap, or it always be the same? Or should I somehow find a database with all possible swap signatures?

#12

I believe it would be different if the underlying swap contract used for the swap is different. You will have to verify it by checking the popular swap contracts.

#13

I hope this would work :slight_smile: Thank you!