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I'm using ethers.js library, I have decoded TX, where I see logs, events, etc.

But is there any way how to check that this transaction contains incoming ETH?

When sending ETH, there is .value attribute, but I didn't find a way how to detect that some contract call caused ETH send.

I can detect token send via transfer event, or I can detect withdraw for WETH->ETH conversion, but I would need some universal way how to get amount of incoming ETH.

Is it possible in any way?

Thanks

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  • if you don't want to enable traces (because it is going to be dead slow) , you can just dump the value to the log at this line : github.com/ethereum/go-ethereum/blob/… add something like: log.Info("value_is","value",value.String(),"contract_addr",addr.String()) (just at the beginning of the function). You will also have to import "github.com/ethereum/go-ethereum/log" package. Then go build and run this custom geth node. Parse the log to extract all the data
    – Nulik
    Commented Jan 25, 2023 at 18:46
  • same for StaticCall() , DelegateCall() and all the call variations
    – Nulik
    Commented Jan 25, 2023 at 18:47
  • but this only will tell you that some contract at some depth receives eth, not that it is "incoming". To check increase in balances you must trace the state changes
    – Nulik
    Commented Jan 25, 2023 at 18:49
  • Unfortunately it's not my contract. I need to call some contracts from the automation script so the only way is probably the slow traces or depends on side-effect events (for example monitor withdraw from WETH if possible, etc). Commented Jan 25, 2023 at 22:02

2 Answers 2

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You need some RPC node provider, which supports traces, to get so-called "internal transactions". For example - debug_traceTransaction You'll get the internal call tree, and you look there for a CALL to the desired address with value > 0

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  • Thanks, I found also this solution but as mentioned above, it's a deadly slow. Obviously it would be much faster to write solution based on events if possible. Commented Jan 25, 2023 at 22:00
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I think there's nothing built-in. You should write a custom function for that in your smart contract.

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  • Unfortunately I need it for contract call from the script, not contract. In case of contract it would be much easier in this case. Commented Jan 25, 2023 at 22:00

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