Track interest rate changes for trading pairs.
| Parameter | Required | Description |
|---|
pair | Yes | Trading pair (e.g., "BTC_USDC") |
expiry | No | Expiry date (e.g., "31OCT25"). If omitted, returns updates for all expiries. |
{
"channel": "interest_rate",
"query": {
"pair": "BTC_USDC",
"expiry": "31OCT25"
}
}
{
"kind": "event",
"type": "interest_rate",
"timestamp_ms": 1677721600000,
"data": {
"sid": "INTEREST-BTC_USDC",
"v": 0.05,
"timestamp": 1677721600000
},
"subscription": {
"channel": "interest_rate",
"query": {
"pair": "BTC_USDC"
}
}
}
| Field | Type | Description |
|---|
data.sid | string | Stream identifier (e.g., "INTEREST-BTC_USDC") |
data.v | number | Interest rate value |
data.timestamp | number | Timestamp in milliseconds |
| Channel | Why |
|---|
| IV (SVI) | Vol surface and interest rate together define options theoretical prices. Rate changes shift the forward, which shifts the entire vol surface mapping. |
| Position | Options positions include mark_interest — the rate used in pricing. Rate changes affect rho exposure. |
| Index Price | Forward = spot * e^(r*T). Rate and index together define the forward price used in options models. |
