request(
    "GET",
    "/v1/custody/mpc/get_max_send_amount/",
    {
        "coin": "ETH",
        "fee_rate": 43638776316,
        "to_address": "0x8a73abedb3053b17204b887af6231a8ac35fc2cc",
        "from_address": "0xa09ba917934c2415fbeb785ed5dc8eaf4f694973"
    },
    api_key, api_secret, host
)

coboFetch('GET', '/v1/custody/mpc/get_max_send_amount/', {
    "coin": "ETH",
    "fee_rate": 43638776316,
    "to_address": "0x8a73abedb3053b17204b887af6231a8ac35fc2cc",
    "from_address": "0xa09ba917934c2415fbeb785ed5dc8eaf4f694973"
}, api_key, api_secret, host)
    .then(res => {
        res.json().then((data)=>{
            console.log(JSON.stringify(data, null, 4));
        })
    }).catch(err => {
        console.log(err)
    });

Request("GET", "/v1/custody/mpc/get_max_send_amount/", map[string]string{
    "coin": "ETH",
    "fee_rate": 43638776316,
    "to_address": "0x8a73abedb3053b17204b887af6231a8ac35fc2cc",
    "from_address": "0xa09ba917934c2415fbeb785ed5dc8eaf4f694973"
})

{
  "success": true,
  "result": {
    "coin": "ETH",
    "coin_decimal": 18,
    "fee_coin": "ETH",
    "fee_decimal": 18,
    "max_send_value": 841165119243622,
    "fee_per_byte": 0,
    "fee_amount": 0,
    "gas_price": 43638776316,
    "gas_limit": 21000
  }
}