metamask-extension/app/scripts/constants/contracts.js

export const SINGLE_CALL_BALANCES_ADDRESS =
  '0xb1f8e55c7f64d203c1400b9d8555d050f94adf39';
export const SINGLE_CALL_BALANCES_ADDRESS_RINKEBY =
  '0x9f510b19f1ad66f0dcf6e45559fab0d6752c1db7';
export const SINGLE_CALL_BALANCES_ADDRESS_ROPSTEN =
  '0xb8e671734ce5c8d7dfbbea5574fa4cf39f7a54a4';
export const SINGLE_CALL_BALANCES_ADDRESS_KOVAN =
  '0xb1d3fbb2f83aecd196f474c16ca5d9cffa0d0ffc';