Get available exchange rates

[
  {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "base_currency": "<string>",
    "target_currency": "<string>",
    "rate": 123,
    "type": "BUY",
    "date": "2023-12-25",
    "source": "<string>"
  }
]