4

I have two transaction, the first from MetaMask (everything is fine)

https://etherscan.io/tx/0x1ab684f4875f8cc28043d9f3c3536a5e4f8a565cadda7a29bc6a96db5f1d0f8f

the second using web3.py (it seems to be identical but fails)

https://etherscan.io/tx/0xc019007895cb7340f65c3bd80df5561c1b1a98d8eac6dc2babf776ab000de067

Here is my part of the code: (I hope it is clear what is going on - it is copied from a class) 

# same as in the working one
abidata = '0x338b5dea000000000000000000000000e41d2489571d322189246dafa5ebde1f4699f49800000000000000000000000000000000000000000000000000002d79883d2000'
trans = {
                        'to': self.address,
                        'from': self.ethapi.address,
                        'data': abidata,
                        'value': 0,
                        'chainId': 1}
# transaction gas data [pseudocode]
trans_new = trans.copy()
nonce = w3.eth.getTransactionCount(self.address)
gas_price = self.get_gas_price()
gas_price_wei = self.w3.toWei(gas_price,"Gwei")
trans_new["gas"] = 250000
trans_new["nonce"] = nonce
trans_new["gasPrice"] = gas_price_wei
signed_transaction = account.signTransaction(trans)
w3.eth.sendRawTransaction(signed_transaction.rawTransaction)

Thanks for any hint!

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6
  • 1
    From the vmtrace it is failing in the token contract. Did you call approve() to allow ED to make a transfer from your address?
    – Ismael ♦
    Commented Feb 13, 2018 at 20:13
  • Actually not. I approved to radarrelay.com. Was playing around. Maybe that is the reason. It's just strange that it seems to work with MetaMask, so I guess there is some kind of difference in both transactions.
    – MichaelRazum
    Commented Feb 13, 2018 at 20:49
  • I removed the approve but still getting the same message: etherscan.io/tx/…
    – MichaelRazum
    Commented Feb 13, 2018 at 21:14
  • You need to send ZrxToken an approval for EtherDelta to make a transfer from your account. If you want to make a deposit to EtherDelta you need to make two transactions 1) ZrxToken.approve(EtherDelta.address, amount, { from: "YourAccount" }), 2) EtherDelta.depositToken(ZrxToken.address, amount, { from: "YourAccount" }).
    – Ismael ♦
    Commented Feb 13, 2018 at 22:56
  • Thanks a lot! I will try it out and post! Its just strange that with MetaMask I see only one transaction that was send from my account.
    – MichaelRazum
    Commented Feb 14, 2018 at 9:12

1 Answer 1

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2

As suggested by Ismael in the comments above, my mistake was that MetaMask did two transactions. So the first one was an approval that was missing.

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