{
  "$schema": "https://json-structure.org/draft/2020-12/schema",
  "name": "HistoricalRatesResponse",
  "type": "object",
  "properties": {
    "result": {"type": "string"},
    "documentation": {"type": "string"},
    "terms_of_use": {"type": "string"},
    "year": {"type": "integer"},
    "month": {"type": "integer"},
    "day": {"type": "integer"},
    "base_code": {"type": "string"},
    "requested_amount": {"type": "['number', 'null']"},
    "conversion_rates": {"type": "['object', 'null']"},
    "conversion_amounts": {"type": "['object', 'null']"}
  }
}