This is occurring on testnet. Trying to calculate a fee for a transaction that will include metada.

Here's the script:

cardano-cli transaction calculate-min-fee \
    --tx-body-file tx.draft \
    --tx-in-count 1 \
    --tx-out-count 1 \
    --witness-count 1 \
    --byron-witness-count 0 \
    --testnet-magic 1097911063 \
    --protocol-params-file testnet-shelley-genesis.json

The error:

Command failed: transaction calculate-min-fee Error: Error while decoding the protocol parameters at: "testnet-shelley-genesis.json" Error: "Error in $: key "protocolVersion" not found"

And the first part of the testnet-shelley-genesis.json file

  "activeSlotsCoeff": 0.05,
  "protocolParams": {
    "protocolVersion": {
      "minor": 0,
      "major": 2
    "decentralisationParam": 1,
    "eMax": 18,
    "extraEntropy": {
      "tag": "NeutralNonce"
    "maxTxSize": 16384,
    "maxBlockBodySize": 65536,
    "maxBlockHeaderSize": 1100,
    "minFeeA": 44,
    "minFeeB": 155381,
    "minUTxOValue": 1000000,
    "poolDeposit": 500000000,
    "minPoolCost": 340000000,
    "keyDeposit": 2000000,
    "nOpt": 150,
    "rho": 0.003,
    "tau": 0.20,
    "a0": 0.3

Checked byron and alonzo genesis files and they do not contain the protocolVersion element. Haven't made any updates to any of the genesis files.

Is there a different params file I should be using?

2 Answers 2


You're using the genesis file instead of the protocol-params-file.

Try using the protocol-params. You can get it using this command:

cardano-cli query protocol-parameters --testnet-magic 1097911063 > protocol-params.json

It works:

cardano-cli transaction calculate-min-fee \
--tx-body-file tx.draft \
--protocol-params-file protocol-params.json \
--testnet-magic 1097911063 \
--tx-in-count 1 \
--tx-out-count 1 \
--witness-count 1
  • 1
    Thanks for the help! The tutorial specifically said protocol-params.json, but since I couldn't find it from the download sites, I thought maybe the tutorial had it wrong, so I assumed one of the genesis files. That worked. Oct 28, 2021 at 0:08

Download the latest files from https://hydra.iohk.io/build/7654130/download/1/index.html

There was an update did you update your node? You should also get the latest config files

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