Calculate-min-fee

Developers Cardano Integration
1

Usin the CLI to compute-min-fee, I have:

cardano-cli transaction calculate-min-fee --tx-body-file /keys/tx.draft --tx-in-count 1 --tx-out-count 2 --witness-count 1 --byron-witness-count 0 --testnet-magic 1097911063 --protocol-params-file protocol.json
176721 Lovelace

My signed tx is 289 bytes and in the protocol.json file I have:

"txFeePerByte": 44,
"txFeeFixed": 155381

Therefore the fee computation that I would do is:

fee = 155381 + ( 289 * 44 ) = 168097 Lovelace.

How do you explain the over estimation of cardano cli?

1 Like
2

Interesting! A few weeks ago, there was also a case with inexplicably high fees (in Daedalus, but that uses cardano-node/cardano-cli internally):

Perhaps, we could look at the code if there is some bug in the minimal fee calculation.

3

Wow, indeed, if it is not unnecessary higher fees set by the user, then the code of cardano-cli has issues…

I am using:

cardano-cli --version
cardano-cli 1.30.1 - linux-x86_64 - ghc-8.10
git rev 0fb43f4e3da8b225f4f86557aed90a183981a64f
4

How are you calculating size of your tx? I grab the cbor string for my end and have to add 3 bytes each time as Im assuming the 3 extra bytes are added when you actually submit it.

Also noticing on adaex which is what I use sometimes to check roughly the size of the tx that their estimates are lower then what I actually have from my cbor for the signed tx

5

If you need a dependable tool to 1 3 random number generator, this is the one you should choose. Its algorithm of uniform distribution ensures a small margin of error, with each number appearing with the same probability.