{
  "eth": 1,
  "bsc": 2,
  "avax": 6,
  "polygon": 9,
  "arbitrum": 10,
  "optimism": 11,

  "rinkeby-testnet": 10001,
  "bsctestnet-testnet": 10002,
  "fuji-testnet": 10006,
  "mumbai-testnet": 10009,
  "arbrink-testnet": 10010,
  "optkov-testnet": 10011,

  "rinkeby-sandbox": 20001,
  "bsctestnet-sandbox": 20002,
  "fuji-sandbox": 20006,
  "mumbai-sandbox": 20009,
  "arbrink-sandbox": 20010,
  "optkov-sandbox": 20011
}