Return a historic rate for a currencies

{
  "type": "object",
  "properties": {
    "amount": {
      "type": "string"
    },
    "date": {
      "type": "string"
    },
    "decimal_places": {
      "type": "string"
    },
    "from": {
      "type": "string"
    },
    "to": {
      "type": "string"
    }
  },
  "required": [
    "date",
    "from",
    "to"
  ],
  "additionalProperties": false
}