Trade Implied Volatility

FreeValueStandardPro

Fetch implied volatility on each trade for an option contract.

• Returns implied volatilies calculated using the trade reported by OPRA.
• The underlying price represents whatever the last underlying price was at the timestamp field. You can read more about how Theta Data calculates greeks here.
• Multi-day requests are limited to 1 month of data, and must specify an expiration.

SPY · 20250321

Client

Auth

Style

symbolstring*

expirationdate*

strikestring

rightstring

datedate

start_timestring

end_timestring

annual_dividendfloat

rate_typestring

rate_valuefloat

versionstring

max_dteint

strike_rangeint

start_datedate

end_datedate

from thetadatadx import Client

client = Client.from_env()

rows = client.market_data.option_history_trade_greeks_implied_volatility(
    "SPY", "20250321",
    strike="570", right="C",
)
for t in rows:
    print(t.ms_of_day, t.price, t.implied_volatility)

Sample response · JSON

[
  {
    "condition": 130,
    "exchange": 22,
    "ext_condition1": 255,
    "ext_condition2": 255,
    "ext_condition3": 255,
    "ext_condition4": 255,
    "implied_vol": 0.3598,
    "iv_error": 0.0002,
    "price": 3.9,
    "sequence": 18902138,
    "size": 2,
    "timestamp": "2024-11-04T09:30:00.471",
    "underlying_price": 221,
    "underlying_timestamp": "2024-11-04T09:30:00"
  },
  {
    "condition": 130,
    "exchange": 6,
    "ext_condition1": 255,
    "ext_condition2": 255,
    "ext_condition3": 255,
    "ext_condition4": 255,
    "implied_vol": 0.3876,
    "iv_error": 0,
    "price": 4.25,
    "sequence": 19368856,
    "size": 1,
    "timestamp": "2024-11-04T09:30:01.626",
    "underlying_price": 221.17,
    "underlying_timestamp": "2024-11-04T09:30:01"
  },
  {
    "condition": 130,
    "exchange": 6,
    "ext_condition1": 255,
    "ext_condition2": 255,
    "ext_condition3": 255,
    "ext_condition4": 255,
    "implied_vol": 0.3842,
    "iv_error": -0.0002,
    "price": 4.22,
    "sequence": 19403970,
    "size": 1,
    "timestamp": "2024-11-04T09:30:01.698",
    "underlying_price": 221.17,
    "underlying_timestamp": "2024-11-04T09:30:01"
  }
]

Parameters

Name	Type	Required	Default	Description
symbol	string	yes	—	Ticker symbol (e.g. AAPL)
expiration	date	yes	—	Expiration date YYYYMMDD. Pass * to select all expirations for the underlying (chain-wide; query one date at a time).
strike	string	no	*	Strike price in dollars as a string (e.g. 500 or 17.5). Use * for wildcard selection.
right	string	no	both	Option side. Use both or * (alias) for calls and puts. Accepted values: call, put, both, *.
date	date	no	—	Single date YYYYMMDD. Supply this for a single-day pull, or supply start_date/end_date for a range. When present, date takes precedence over the range.
start_time	string	no	09:30:00	Start time filter
end_time	string	no	16:00:00	End time filter
annual_dividend	float	no	—	Annualized expected dividend amount, in dollars per share, used in the Greeks calculation (e.g. 2.5 is $2.50 per share per year).
rate_type	string	no	sofr	Risk-free-rate source used in the Greeks calculation. Accepted values: sofr, treasury_m1, treasury_m3, treasury_m6, treasury_y1, treasury_y2, treasury_y3, treasury_y5, treasury_y7, treasury_y10, treasury_y20, treasury_y30.
rate_value	float	no	—	Interest rate as a percent (4.36 means 4.36%, matching the InterestRateTick.rate convention) used in the Greeks calculation. Applied when rate_type selects a manual rate.
version	string	no	latest	Greeks model version. Accepted values: latest, 1.
max_dte	int	no	—	Maximum days to expiration
strike_range	int	no	—	Strike range filter
start_date	date	no	—	Start date YYYYMMDD
end_date	date	no	—	End date YYYYMMDD
timeout_ms	int	no	—	Per-request deadline in milliseconds. 0 means no deadline.

Response

Rows of TradeGreeksImpliedVolatilityTick:

Field	Type	Description
ms_of_day	i32	Milliseconds since midnight Eastern Time.
sequence	i32	Exchange-assigned trade sequence number.
ext_condition1	i32	Additional trade condition code.
ext_condition2	i32	Additional trade condition code.
ext_condition3	i32	Additional trade condition code.
ext_condition4	i32	Additional trade condition code.
condition	i32	Trade condition code.
size	i32	Number of contracts or shares traded.
exchange	i32	Exchange code where the trade executed.
price	f64	Trade price.
implied_volatility	f64	Implied volatility solved from the option price.
iv_error	f64	Residual pricing error of the implied-volatility solve.
underlying_ms_of_day	i32	Timestamp of the underlying price, milliseconds since midnight ET.
underlying_price	f64	Underlying price used in the calculation (midpoint of the underlying).
date	i32	Trading date as a YYYYMMDD integer.

Wildcard requests additionally populate expiration (YYYYMMDD), strike (dollars), and right ("C" / "P") on every row to identify the contract; on single-contract requests these are absent (None / null / undefined; the Rust and C rows carry the documented 0 / 0.0 / '\0' fills).