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This stream provides option contract definitions with live mark price, implied volatility, and Greeks. It is scoped by underlying and expiration date. Subscribe with the optionsContracts subscription. Live optionsContractUpdate messages stream price, IV, and Greek changes per contract, and you can request a full snapshot with emitOptionsContracts. Upon subscription to this stream, you immediately begin receiving optionsContractUpdate messages as each contract’s price, IV, and Greeks change: 
{
  "resultType": "optionsContractUpdate",
  "market": "BTC-10JUL26-55000-C",
  "data": {
    "contractName": "BTC-10JUL26-55000-C",
    "underlying": "BTC-USDT",
    "strike": "55000",
    "optionType": "C",
    "expiryDate": "2026-07-10",
    "markPrice": "8810.9085883",
    "markIV": "0.6571",
    "indexPrice": "63794.6796692",
    "delta": "0.9889426",
    "gamma": "0.0000069",
    "vega": "185.7490523",
    "theta": "-16.6912762",
    "rho": "-88.2604965"
  }
}
FieldTypeRequiredDescription
resultTypestringYesoptionsContractUpdate
marketstringYesContract name
data.contractNamestringYesContract name
data.underlyingstringYesUnderlying market, e.g. BTC-USDT
data.strikestringYesStrike price
data.optionTypestringYesC (call) or P (put)
data.expiryDatestringYesExpiry date (YYYY-MM-DD)
data.markPricestringYesMark price
data.markIVstringYesMark implied volatility
data.indexPricestringYesUnderlying index price
data.delta / gamma / vega / theta / rhostringYesGreeks — see Pricing & Greeks

​
Contracts Snapshot Request

Request the full set of contracts for an underlying and expiration with emitOptionsContracts, which returns an optionsContracts message. Use it to enumerate what’s tradable before processing updates.

​
Request

{
  "message": "emitOptionsContracts",
  "content": {
    "clientRequestId": "ec5e9e21-e4dd-47dd-af9b-345b2b3ea976",
    "underlying": "BTC",
    "expirationDate": "2026-07-10"
  }
}
FieldTypeRequiredDescription
messagestringYesemitOptionsContracts
content.clientRequestIdstringNoClient-generated UUID for correlation
content.underlyingstringYesUnderlying asset, e.g. BTC
content.expirationDatestringYesExpiration date, YYYY-MM-DD
content.pageSizenumberNoPage size for paginated results
content.pageTokenstringNoCursor for the next page

​
Response

{
  "resultType": "optionsContracts",
  "market": "BTC",
  "data": {
    "clientRequestId": "ec5e9e21-e4dd-47dd-af9b-345b2b3ea976",
    "contracts": [
      {
        "contractName": "BTC-10JUL26-63000-C",
        "underlying": "BTC-USDT",
        "strike": "63000",
        "optionType": "C",
        "expiryDate": "2026-07-10",
        "markPrice": "1334.5252004",
        "bidPrice": "749.89",
        "askPrice": "751.71",
        "bidSize": "8",
        "askSize": "4",
        "markIV": "0.3899",
        "bidIV": "0.4178",
        "askIV": "0.4185",
        "indexPrice": "63654.9041377805",
        "delta": "0.6089291",
        "gamma": "0.0001548",
        "vega": "2443.5719736",
        "theta": "-130.4974464",
        "rho": "-13.346896",
        "openInterest": "0",
        "volume24h": "0"
      },
      {
        "contractName": "BTC-10JUL26-63000-P",
        "underlying": "BTC-USDT",
        "strike": "63000",
        "optionType": "P",
        "expiryDate": "2026-07-10",
        "markPrice": "699.9441769",
        "bidPrice": "1626.58",
        "askPrice": "1627.55",
        "bidSize": "4",
        "askSize": "4",
        "markIV": "0.3899",
        "bidIV": "0.5033",
        "askIV": "0.5037",
        "indexPrice": "63654.9041377805",
        "delta": "-0.3910709",
        "gamma": "0.0001548",
        "vega": "2443.5719736",
        "theta": "-130.4974464",
        "rho": "-7.000304",
        "openInterest": "2",
        "volume24h": "0"
      },
      {
        "contractName": "BTC-10JUL26-66000-C",
        "underlying": "BTC-USDT",
        "strike": "66000",
        "optionType": "C",
        "expiryDate": "2026-07-10",
        "markPrice": "189.4994388",
        "bidPrice": "108.89",
        "askPrice": "109.11",
        "bidSize": "4",
        "askSize": "8",
        "markIV": "0.3597",
        "bidIV": "0.4191",
        "askIV": "0.4193",
        "indexPrice": "63654.9041377805",
        "delta": "0.159895",
        "gamma": "0.0001062",
        "vega": "1547.8386699",
        "theta": "-76.258031",
        "rho": "-1.8952461",
        "openInterest": "0",
        "volume24h": "0"
      }
    ],
    "statusCode": 200
  }
}
FieldTypeRequiredDescription
resultTypestringYesoptionsContracts
marketstringYesUnderlying asset (echoes the request underlying)
data.clientRequestIdstringNoClient-generated UUID for correlation
data.contractsarrayYesContract definitions
data.contracts[].contractNamestringYesContract name
data.contracts[].underlyingstringYesUnderlying market, e.g. BTC-USDT
data.contracts[].strikestringYesStrike price
data.contracts[].optionTypestringYesC (call) or P (put)
data.contracts[].expiryDatestringYesExpiry date
data.contracts[].markPricestringYesMark price
data.contracts[].bidPrice / askPricestringYesBest bid / ask price
data.contracts[].bidSize / askSizestringYesBest bid / ask size
data.contracts[].markIV / bidIV / askIVstringYesMark / bid / ask implied volatility (bidIV / askIV may be empty when a side has no firm quote)
data.contracts[].indexPricestringYesUnderlying index price
data.contracts[].delta / gamma / vega / theta / rhostringYesGreeks — see Pricing & Greeks
data.contracts[].openIntereststringYesOpen interest
data.contracts[].volume24hstringYes24h traded volume
data.statusCodenumberYes200