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.

Beta compatibility

This compatibility layer has automated test coverage but has not yet been validated against live Orats API traffic. If you encounter any inconsistencies with Orats' wire format, please contact support@lavender-ts.com.

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"
    }
  ]
}

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

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`)
`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)

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.

Migrating from Orats¶

One change:

Base URL — replace https://api.orats.io with http://localhost:2112

Your token parameter is accepted and ignored — leave it or remove it.

The endpoint path, query parameters, response shape, and field names are identical.

How Lavender's Greeks Compare¶

Orats is one of the most advanced option analytics platforms available — its SMV methodology, residual yield approach, and early exercise handling set the standard. If you're using Orats today, your Greeks already account for many effects that simpler models miss.

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`	`lav_vol`
`callValue` / `putValue`	`lav_theo`
`delta` (call-side only)	`delta` (per contract)

Error Responses¶

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