How do I find the fee of a received transaction?

NielDLR

member

Activity: 95

Merit: 10

Quote from: Revalin on May 21, 2013, 11:17:11 PM

Total inputs - total outputs = fees

For example:
http://blockchain.info/tx/1c7179f134e553df60e5f5bc2f6484e7c10ae04d04373d63e2fc86cb0f978295

1.69788468 in
1.44 + 0.25688468 = 1.69688468 out

1.69788468 - 1.69688468 = 0.001 fee

Hi Revalin,

ah yes. I figured that out. But I was wondering how to programmatically determine that. But I've since figured it out.

I wasn't sure how to get the exact "input" amount from the getrawtransaction api call, because each 'vin' only had the txid. There were multiple outputs (addresses) for each input. Then after some deeper research I found that the 'vout' reference in each input was a reference to the output of that corresponding input.

Once I found that out, it was each to calculate the input total and then minus the outputs to get the fee!

Revalin

hero member

Activity: 728

Merit: 500

165YUuQUWhBz3d27iXKxRiazQnjEtJNG9g

Total inputs - total outputs = fees

For example:
http://blockchain.info/tx/1c7179f134e553df60e5f5bc2f6484e7c10ae04d04373d63e2fc86cb0f978295

1.69788468 in
1.44 + 0.25688468 = 1.69688468 out

1.69788468 - 1.69688468 = 0.001 fee

NielDLR

member

Activity: 95

Merit: 10

I'm currently developing a bitcoin service and to mitigate risk in zero-confirm transactions, I want to determine if a transaction has a miners fee attached to it or not.

How can I do this?

I know send transactions include the 'fee' in the details field in the gettransaction api call. But if I receive bitcoins how can I determine if it has a fee attached? Any help here would be appreciated.

I see Blockchain.info has this information, so I know it's possible.

Topic: How do I find the fee of a received transaction? (Read 717 times)