> ## Documentation Index > Fetch the complete documentation index at: https://docs.amberdata.io/llms.txt > Use this file to discover all available pages before exploring further. # Volatility Index Decorated > This endpoint returns the value of the BTC (or other altcoin) VIX. Along with the volatility index we are also returned underlying volatility surface datapoints (such as skew) and underlying spot prices. ## OpenAPI ````yaml get /analytics/volatility/index-decorated openapi: 3.1.0 info: title: derivatives-api version: '2' servers: - url: https://api.amberdata.com/markets/derivatives security: - sec0: [] paths: /analytics/volatility/index-decorated: get: summary: Volatility Index Decorated description: >- This endpoint returns the value of the BTC (or other altcoin) VIX. Along with the volatility index we are also returned underlying volatility surface datapoints (such as skew) and underlying spot prices. operationId: derivatives-volatility-index-decorated parameters: - name: currency in: query description: >- **[Optional]** The underlying currency for which to retrieve the volatility index. **[Examples]** `BTC | SOL_USDC` Note: inverse options have underlying currencies formatted as (BTC, ETH) while linear option currency formats include the stable coin in the same (SOL_USDC) required: true schema: type: string default: BTC - name: exchange in: query description: >- **[Optional]** The exchange for which to retrieve the volatility index. **[Examples]** `deribit` schema: type: string default: deribit - name: startDate in: query description: >- **[Optional]** Payload only includes data after this date (inclusive). **[Formats]** `seconds | milliseconds | iso8601` **[Examples]** `1578531600 | 1578531600000 | 2020-09-01T01:00:00` schema: type: string format: date-time default: '2024-01-01' - name: endDate in: query description: >- **[Optional]** Payload only includes data before this date (exclusive). **[Formats]** `seconds | milliseconds | iso8601` **[Examples]** `1578531600 | 1578531600000 | 2020-09-01T01:00:00` schema: type: string format: date-time default: '2024-06-01' - name: timeInterval in: query description: >- **[Optional]** Time interval of data frequency for the selected date range. **[Examples]** `minute | hour | day` **[Note]** Due to the density of data historical date ranges are limited to 60x 1-minute or 24x 1 hour intervals, per call. schema: type: string default: day - name: timeFormat in: query description: >- **[Optional]** Time format of the timestamps in the return payload. **[Defaults]** `milliseconds | ms* | iso | iso8601 | hr | human_readable` schema: type: string responses: '200': description: '200' content: application/json: schema: type: object properties: status: type: integer example: 200 title: type: string example: OK description: type: string example: Successful request payload: type: object properties: data: type: array items: type: object properties: exchangeTimestamp: type: string example: '2024-06-06 19:00:00.0' description: >- The timestamp when the data was received from the exchange exchange: type: string example: deribit description: >- The exchange where the volatility index is calculated instrument: type: string example: DERIBIT_BTC_DVOL_INDEX description: >- The instrument identifier for the volatility index currency: type: string example: BTC description: The underlying currency for the volatility index indexPrice: type: number example: 71043.50828947368 description: The index price of the underlying asset underlyingPrice: type: number example: 71970.97051523329 description: The current price of the underlying asset close: type: number example: 52.83 description: The closing value of the volatility index atm: type: number example: 51.51823745869919 description: At The Money volatility delta50: type: number example: 51.69346060959675 description: 50% delta volatility deltaCall25: type: number example: 53.87852293010057 description: 25% delta call volatility deltaPut25: type: number example: 50.85645481877562 description: 25% delta put volatility delta25RrSkew: type: number example: 3.0220681113249555 description: 25% delta risk reversal skew (call25 - put25) daysAgo: type: integer example: 0 description: Number of days ago from the current date examples: Result: value: status: 200 title: OK description: Successful request payload: data: - exchangeTimestamp: '2024-06-06 19:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71043.50828947368 underlyingPrice: 71970.97051523329 close: 52.83 atm: 51.51823745869919 delta50: 51.69346060959675 deltaCall25: 53.87852293010057 deltaPut25: 50.85645481877562 delta25RrSkew: 3.0220681113249555 daysAgo: 0 - exchangeTimestamp: '2024-06-06 18:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71082.68947368421 underlyingPrice: 71991.85266862402 close: 53.41 atm: 51.84655133119005 delta50: 52.08967881730025 deltaCall25: 54.6118859256467 deltaPut25: 50.99467108317352 delta25RrSkew: 3.6172148424731816 daysAgo: 0 - exchangeTimestamp: '2024-06-06 17:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 70942.9730263158 underlyingPrice: 71829.62975556214 close: 53.98 atm: 52.295710475490786 delta50: 52.519859459978484 deltaCall25: 54.97627457056669 deltaPut25: 51.735387054397926 delta25RrSkew: 3.240887516168762 daysAgo: 0 - exchangeTimestamp: '2024-06-06 16:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71286.85078947368 underlyingPrice: 72181.80892269053 close: 53.77 atm: 52.407733011148984 delta50: 52.68940994786385 deltaCall25: 55.142702045236575 deltaPut25: 51.76170758437015 delta25RrSkew: 3.3809944608664253 daysAgo: 0 - exchangeTimestamp: '2024-06-06 15:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71447.76342105263 underlyingPrice: 72352.4542939263 close: 53.85 atm: 52.55276118850411 delta50: 52.797910334780966 deltaCall25: 55.07595206633709 deltaPut25: 51.84902165650667 delta25RrSkew: 3.226930409830416 daysAgo: 0 - exchangeTimestamp: '2024-06-06 14:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71099.5719736842 underlyingPrice: 72001.66591824421 close: 54.23 atm: 52.804515216361246 delta50: 53.046452812096526 deltaCall25: 55.20535397298803 deltaPut25: 52.139981889507794 delta25RrSkew: 3.0653720834802343 daysAgo: 0 - exchangeTimestamp: '2024-06-06 13:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71164.67631578947 underlyingPrice: 72070.29267796311 close: 54.37 atm: 52.93513315093241 delta50: 53.172765140955036 deltaCall25: 55.23797706426304 deltaPut25: 52.258711235453426 delta25RrSkew: 2.9792658288096163 daysAgo: 0 - exchangeTimestamp: '2024-06-06 12:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71158.46513157895 underlyingPrice: 72066.77844289514 close: 54.26 atm: 52.73245258295585 delta50: 52.91153814509892 deltaCall25: 54.437753047972116 deltaPut25: 52.31423199021567 delta25RrSkew: 2.1235210577564487 daysAgo: 0 - exchangeTimestamp: '2024-06-06 11:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 70995.26078947369 underlyingPrice: 71886.0726613873 close: 54.22 atm: 52.72682495035447 delta50: 52.843333071667374 deltaCall25: 54.51598575412658 deltaPut25: 52.429702737993075 delta25RrSkew: 2.086283016133507 daysAgo: 0 - exchangeTimestamp: '2024-06-06 10:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 70984.3569736842 underlyingPrice: 71858.46639831913 close: 54.42 atm: 52.8322947967893 delta50: 52.93831172675815 deltaCall25: 54.960893111757116 deltaPut25: 52.53978823598809 delta25RrSkew: 2.421104875769025 daysAgo: 0 - exchangeTimestamp: '2024-06-06 09:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 70924.06368421053 underlyingPrice: 71767.35366706343 close: 54.5 atm: 53.001041966737795 delta50: 53.12697739069145 deltaCall25: 55.14923407325927 deltaPut25: 52.70246052706958 delta25RrSkew: 2.4467735461896893 daysAgo: 0 - exchangeTimestamp: '2024-06-06 08:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71026.84 underlyingPrice: 71906.49270059494 close: 54.49 atm: 52.9329612640609 delta50: 53.12541169275627 deltaCall25: 55.29681698268398 deltaPut25: 52.413425375306225 delta25RrSkew: 2.883391607377753 daysAgo: 0 - exchangeTimestamp: '2024-06-06 07:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 70902.30483333333 underlyingPrice: 71752.4955656904 close: 54.67 atm: 53.08188974686868 delta50: 53.25575324970096 deltaCall25: 55.217421072111975 deltaPut25: 52.722240860339376 delta25RrSkew: 2.495180211772599 daysAgo: 0 - exchangeTimestamp: '2024-06-06 06:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 70898.44 underlyingPrice: 71757.93781441746 close: 55.04 atm: 53.598200059652605 delta50: 53.7886762535623 deltaCall25: 55.70634252840137 deltaPut25: 53.25274655714243 delta25RrSkew: 2.4535959712589417 daysAgo: 0 - exchangeTimestamp: '2024-06-06 05:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71066.32733333333 underlyingPrice: 71918.14497953827 close: 55.03 atm: 53.63457068741584 delta50: 53.83309517086581 deltaCall25: 55.627672947055224 deltaPut25: 53.257404554650144 delta25RrSkew: 2.3702683924050802 daysAgo: 0 - exchangeTimestamp: '2024-06-06 04:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71068.16166666667 underlyingPrice: 71894.56757070626 close: 55.09 atm: 53.72015029950521 delta50: 53.90733383778383 deltaCall25: 55.99887272025997 deltaPut25: 53.1503270208576 delta25RrSkew: 2.848545699402365 daysAgo: 0 - exchangeTimestamp: '2024-06-06 03:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71173.38233333334 underlyingPrice: 72029.09966284121 close: 55.3 atm: 53.967537997391844 delta50: 54.174395573944956 deltaCall25: 56.1118163353827 deltaPut25: 53.47254569798131 delta25RrSkew: 2.6392706374013883 daysAgo: 0 - exchangeTimestamp: '2024-06-06 02:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71140.54816666667 underlyingPrice: 71992.71789138885 close: 55.36 atm: 53.85043370431609 delta50: 54.07247739905966 deltaCall25: 56.138735532553135 deltaPut25: 53.50301771649843 delta25RrSkew: 2.635717816054708 daysAgo: 0 - exchangeTimestamp: '2024-06-06 01:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71026.21283333334 underlyingPrice: 71876.60197693041 close: 55.52 atm: 54.12098422741766 delta50: 54.368863372268386 deltaCall25: 56.526187794547276 deltaPut25: 53.522339075354196 delta25RrSkew: 3.00384871919308 daysAgo: 0 - exchangeTimestamp: '2024-06-06 00:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71118.75666666667 underlyingPrice: 71975.70021577465 close: 55.64 atm: 54.07249057342441 delta50: 54.30455606587215 deltaCall25: 56.31610733763884 deltaPut25: 53.7084854358118 delta25RrSkew: 2.607621901827038 daysAgo: 0 - exchangeTimestamp: '2024-06-05 23:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71154.62633333333 underlyingPrice: 72048.304821437 close: 55.82 atm: 54.29419242827043 delta50: 54.45745198936885 deltaCall25: 56.27758307903957 deltaPut25: 54.108429777844606 delta25RrSkew: 2.1691533011949673 daysAgo: 0 - exchangeTimestamp: '2024-06-05 22:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71156.08216666666 underlyingPrice: 72045.374582141 close: 56.16 atm: 54.81246301578333 delta50: 54.97828170974095 deltaCall25: 56.79550490379206 deltaPut25: 54.44413386048209 delta25RrSkew: 2.3513710433099675 daysAgo: 0 - exchangeTimestamp: '2024-06-05 21:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71212.97399999999 underlyingPrice: 72097.39678039736 close: 56.28 atm: 54.94573075050074 delta50: 55.18486513504689 deltaCall25: 57.35117215968467 deltaPut25: 54.36256606116892 delta25RrSkew: 2.9886060985157528 daysAgo: 0 - exchangeTimestamp: '2024-06-05 20:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71309.9465 underlyingPrice: 72156.7070441139 close: 56.39 atm: 54.970876704619776 delta50: 55.2046408641653 deltaCall25: 57.20324761796363 deltaPut25: 54.74140363215486 delta25RrSkew: 2.461843985808777 daysAgo: 0 - exchangeTimestamp: '2024-06-05 19:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71093.25466666667 underlyingPrice: 72002.53197370801 close: 56.26 atm: 55.08335782618 delta50: 55.330956178534784 deltaCall25: 57.55316565374264 deltaPut25: 54.350317611601 delta25RrSkew: 3.202848042141639 daysAgo: 1 - exchangeTimestamp: '2024-06-05 18:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71642.4225 underlyingPrice: 72572.31286339424 close: 56.63 atm: 55.585083251379366 delta50: 55.83004823344287 deltaCall25: 57.80566120086786 deltaPut25: 54.80447103901212 delta25RrSkew: 3.001190161855739 daysAgo: 1 - exchangeTimestamp: '2024-06-05 17:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71319.163 underlyingPrice: 72228.35193022514 close: 56.67 atm: 55.768841718112256 delta50: 56.05536656377461 deltaCall25: 58.02236449856287 deltaPut25: 54.92292351116763 delta25RrSkew: 3.0994409873952407 daysAgo: 1 - exchangeTimestamp: '2024-06-05 16:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 71605.79666666666 underlyingPrice: 72512.96521099427 close: 56.21 atm: 54.97759744236457 delta50: 55.23094249751539 deltaCall25: 57.26013726268294 deltaPut25: 54.380090746095405 delta25RrSkew: 2.8800465165875337 daysAgo: 1 - exchangeTimestamp: '2024-06-05 15:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 70882.53566666666 underlyingPrice: 71763.95365937233 close: 55.95 atm: 54.652055102615996 delta50: 54.86757901941423 deltaCall25: 57.002092499551104 deltaPut25: 54.04584155141366 delta25RrSkew: 2.956250948137445 daysAgo: 1 - exchangeTimestamp: '2024-06-05 14:00:00.0' exchange: deribit instrument: DERIBIT_BTC_DVOL_INDEX currency: BTC indexPrice: 70733.97516666666 underlyingPrice: 71584.58825913753 close: 55.74 atm: 54.48226136759716 delta50: 54.74012873530287 deltaCall25: 57.25799202519757 deltaPut25: 53.7777208838321 delta25RrSkew: 3.4802711413654634 daysAgo: 1 '400': description: '400' content: application/json: examples: Result: value: {} schema: type: object properties: {} deprecated: false security: - ApiKeyAuth: [] components: securitySchemes: ApiKeyAuth: type: apiKey in: header name: x-api-key ````