espocrm-base/application/Espo/Metadata/fields/currency.json

{
   "params":[
      {
         "name":"required",
         "type":"bool",
         "default":false
      },
      {
         "name":"min",
         "type":"float"
      },
      {
         "name":"max",
         "type":"float"
      }
   ],
   "actualFields":[
      "currency",
      ""
   ],
   "search":{
      "basic":false,
      "advanced":true
   }
}