request(
    "GET",
    "/v1/custody/mpc/get_supported_chains/", {},
    api_key, api_secret, host
)

coboFetch('GET', '/v1/custody/mpc/get_supported_chains/', {}, 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_supported_chains/", map[string]string{})

{
  "success": true,
  "result":{
      "chain_codes": [
        "BSC_BNB",
        "ETH",
        "GETH",
        "TBSC_BNB",
        "MATIC",
        "ARBITRUM_ETH"
      ]
  }
}