Subscription informs you of changes in the approximate rate for a given currency pair.
{
 "action": "subscribe-public",
 "module": "cantor_service",
 "path": "rates/{source_currency}/{destination_currrency}"
}{
  "action": "push",
  "topic": "cantor_service/rates/usd/eur",
  "message": {
    "rate": 1.164875,
    "rateCurrency": "USD"
  },
  "timestamp": "1576845911374",
  "seqNo": 4317604
}Response details:
| Key | Type | Description | 
|---|---|---|
| rate | decimal | Approximate rate. | 
| rateCurrency | string | Currency rate. | 
