stable/freqtrade/templates/subtemplates/exchange_kraken.j2

"download_trades": true,
"exchange": {
    "name": "kraken",
    "key": "{{ exchange_key }}",
    "secret": "{{ exchange_secret }}",
    "ccxt_config": {"enableRateLimit": true},
    "ccxt_async_config": {
        "enableRateLimit": true,
        "rateLimit": 1000
        // Enable the below for downoading data.
        //"rateLimit": 3100
    },
    "pair_whitelist": [
    ],
    "pair_blacklist": [

    ]
}