Get exchange rates.

Example response

{
  "status": "success",
  "message": "Exchange rates retrieved successfully",
  "data": {
    "USDAED": 2.634,
    "NGNUSD": 0.0006,
    "NGNSTN": 0.0511,
    "validUntil": "9/9/2024, 8:00:00 AM UTC",
    "expiresAt": "9/9/2024, 8:00:00 AM UTC",
    "expiresAtTimestamp": 1725868800000
  }
}