From Orats — Strikes Data¶

Looking for a second source of option Greeks alongside Orats, or an independent set of Greeks to compare against your Orats SMV? Lavender delivers independently computed Greeks through Orats' own wire format — no code changes required.

Already fetching option Greeks and volatility data from Orats? Swap the host — your existing code works unchanged.

Differences from Orats¶

Lavender matches Orats' wire format with a few specific differences worth knowing when migrating:

Market-data fields are zeroed. callBidPrice, callAskPrice, callVolume, callOpenInterest, and the put-side equivalents come back with 0 values. Lavender computes Greeks; it does not redistribute OPRA quotes.
Multi-symbol querying limited. Comma-delimited ticker= is accepted but only the first symbol is used; make one request per ticker.
token parameter / auth header accepted-but-ignored. Leave it or remove it.

For the modeling differences (American exercise, discrete dividends, calibrated borrow), see How Lavender's Greeks Differ below.

What Changes¶

Your current callSame call through Lavender

curl -H "Authorization: Bearer YOUR_Orats_TOKEN" \
     "https://api.orats.io/datav2/strikes?ticker=SPY&dte=0,30"
#      ^^^^^^^^^^^^^^^^^

curl "http://localhost:2112/datav2/strikes?ticker=SPY&dte=0,30"
#     ^^^^^^^^^^^^^^^^^^^^^^^^^^^

Swap the host. Your token parameter or auth header is accepted and ignored.

Try it in your browser¶

http://localhost:2112/datav2/strikes?ticker=SPY&dte=0,30&format=html

Paste this into any browser to see Orats-format Greeks rendered as an HTML table. No code needed.

Same Response Format¶

The JSON you get back has the same data array with one row per (expiration, strike) — both call and put data in the same row, just like Orats:

{
  "data": [
    {
      "ticker": "SPY",
      "tradeDate": "2026-03-14",
      "expirDate": "2026-12-18",
      "dte": 279,
      "strike": 570.0,
      "stockPrice": 567.41,
      "spotPrice": 567.41,
      "callVolume": 0,
      "callOpenInterest": 0,
      "callBidSize": 0,
      "callAskSize": 0,
      "callBidPrice": 0,
      "callAskPrice": 0,
      "callValue": 18.23,
      "callBidIv": 0.2100,
      "callMidIv": 0.2346,
      "callAskIv": 0.2592,
      "putVolume": 0,
      "putOpenInterest": 0,
      "putBidSize": 0,
      "putAskSize": 0,
      "putBidPrice": 0,
      "putAskPrice": 0,
      "putValue": 0.82,
      "putBidIv": 0.2150,
      "putMidIv": 0.2346,
      "putAskIv": 0.2542,
      "extCallValue": 18.23,
      "extPutValue": 0.82,
      "smvVol": 0.2346,
      "extSmvVol": 0.2346,
      "delta": 0.9512,
      "gamma": 0.0223,
      "theta": -0.0877,
      "vega": 0.2514,
      "rho": 0.3124,
      "phi": 0,
      "driftlessTheta": -0.0877,
      "residualRate": 0,
      "updatedAt": "2026-03-14T12:00:00Z",
      "snapShotDate": "2026-03-14",
      "quoteDate": "2026-03-14T12:00:00Z"
    }
  ]
}

Market data fields are zeroed

Fields like callBidPrice, callAskPrice, callVolume, callOpenInterest (and their put-side equivalents) are zeroed. The Greeks, IV, and model value fields contain Lavender's computed values.

Endpoint¶

GET /datav2/strikes
GET /datav2/strikes.json
GET /datav2/strikes.csv

The .json and .csv path extensions are accepted and used as the format hint when the format query parameter is absent.

Parameters¶

Parameter	Type	Required	Description
`ticker`	string	Yes	Underlying ticker (e.g., `SPY`). Comma-delimited supported; first symbol is used
`token`	string	No	API key — accepted and ignored
`dte`	string	No	DTE range filter as `min,max` (e.g., `0,30` for 0–30 days)
`delta`	string	No	Call-side delta range as `min,max` (e.g., `.20,.80`)

Response Fields¶

Row Structure¶

Each element in the data array represents a single (expiration, strike) pair. Both call and put data appear in the same row — this matches Orats convention and differs from per-contract vendors.

Identification¶

Field	Type	Description
`ticker`	string	Underlying symbol
`tradeDate`	string	Current date (`YYYY-MM-DD`)
`snapShotDate`	string	Trading date (`YYYY-MM-DD`). Same value as `tradeDate`.
`expirDate`	string	Expiration date (`YYYY-MM-DD`)
`dte`	integer	Calendar days to expiration
`strike`	number	Strike price
`stockPrice`	number	Current underlying price
`spotPrice`	number	Same as `stockPrice`

Model Values¶

Field	Type	Description
`callValue`	number	Theoretical call price
`putValue`	number	Theoretical put price
`extCallValue`	number	Same as `callValue`
`extPutValue`	number	Same as `putValue`

Implied Volatility¶

Field	Type	Description
`callBidIv`	number	Call IV at bid
`callMidIv`	number	Call IV at mid
`callAskIv`	number	Call IV at ask
`putBidIv`	number	Put IV at bid
`putMidIv`	number	Put IV at mid
`putAskIv`	number	Put IV at ask
`smvVol`	number	Smoothed model volatility
`extSmvVol`	number	Same as `smvVol`

Greeks¶

Greeks are call-side — delta ranges from 0 to 1. To get put delta, subtract 1 (put delta = delta − 1).

Field	Type	Description
`delta`	number	\(\partial V / \partial S\) — call-side (0 to 1)
`gamma`	number	\(\partial^2 V / \partial S^2\)
`theta`	number	\(\partial V / \partial t\) — per calendar day
`vega`	number	\(\partial V / \partial \sigma\)
`rho`	number	\(\partial V / \partial r\)
`phi`	number	Dividend rho (always `0`)
`driftlessTheta`	number	Theta excluding drift (same as `theta`)
`residualRate`	number	Always `0`
`updatedAt`	string	Timestamp (ISO 8601)
`quoteDate`	string	Timestamp (ISO 8601). Same value as `updatedAt`.

Greek Scaling¶

All Greeks are in natural units. Theta is returned per calendar day. All output values are rounded to 4 decimal places.

Call-side Greeks

Following Orats convention, delta is call delta (0 to 1). For put delta, compute delta - 1. Gamma, theta, vega, and rho are the same for both sides of a strike.

How Lavender's Greeks Differ¶

Running Lavender alongside Orats gives you a second, independently computed perspective on the same contracts:

Independent model — Lavender computes Greeks using different modeling assumptions. Where the two reports agree, you have confirmation. Where they diverge — particularly around ex-dates, deep ITM, or illiquid strikes — you have a signal worth investigating.
Two views of time decay — conventional theta (\(\partial V / \partial t\)) on this endpoint, plus a separate decay metric (expected change to next trading day, accounting for weekends and holidays) on the Lavender API. The difference between theta and decay is most visible over weekends and around market holidays.
Extended Greeks — access second and third-order Greeks via the Lavender API.

Migrating to the Lavender Native API¶

ORATS	Lavender API
`ticker`	`root`
`expirDate`	`expiry`
`smvVol`	`vol`
`callValue` / `putValue`	`theo`
`delta` (call-side only)	`delta` (per contract)

Error Responses¶

Status	Condition
`200`	Success
`400`	Missing `ticker` parameter
`502`	Upstream data unavailable

Error response body¶

Errors return a JSON envelope:

{
  "message": "Missing ticker"
}