query user($address: String) {

  exchanges(
    where:{
      from:$address
    }
  ) {
    id
  }
  

}

function(data) {
  if (data == null || data.exchanges == null) {
    return 0
  } else if (Array.isArray(data.exchanges) && data.exchanges.length == 0) {
    return 0
  }
  return 1
}