I am pulling a trace from a Parity node using the JSONRPC API. It looks like this:

    'action': {
        'callType': 'staticcall',
        'gas': '0x1ad02e',
        'input': '0x2f58b80d',
        'value': '0x0'
    'result': {'gasUsed': '0x501', 'output': '0x000000000000000000000000082b0ca59f2122c94e5f57db0085907fa9584ba6'},
    'subtraces': 0,
    'traceAddress': [0, 0],
    'type': 'call'

I can decode the input using the ABI from the to address, but this doesn't seem to work for the result.output field.

# this works
(<Function balanceOf(address)>, {'': '0xYYYYYYYYYYYYYYYYYYYYYYYY'})

# this does not
*** ValueError: Could not find any function with matching selector

Is the output encoded in a different way, maybe one that isn't tied to the ABI for the input?

I am not able to find documentation on how to decode it. I also tried using decode_function_input() for the ABI it calls, but that didn't seem to work either.

  • Any updates on this? @lollercoaster were you able to find any solutions for this?
    – pbsh
    Commented Jan 28, 2022 at 14:46

1 Answer 1


In your code for


Your contract object is of the token in question or of the router? E.g. on BSC (BinanceSmartChain), you need to use the PancakeSwapRouter Version2 address (I know because I am decoding transaction.input data there on daily basis).

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