Implied Volatility

FreeValueStandardPro

Get implied volatility snapshot for an option contract (from ThetaData server).

Returns implied volatilies calculated using the national best bid, mid, and ask price of the option respectively. The underlying price represents whatever the last underlying price was at the underlying_timestamp field. You can read more about how Theta Data calculates greeks here.

pub fn option_snapshot_greeks_implied_volatility(&self, symbol: &str, expiration: &str) -> OptionSnapshotGreeksImpliedVolatilityBuilder<'_>

Optional parameters chain on the builder: .strike(&str), .right(&str), .annual_dividend(f64), .rate_type(&str), .rate_value(f64), .stock_price(f64), .version(&str), .max_dte(i32), .strike_range(i32), .min_time(&str), .use_market_value(bool). Execute with .await → Result<Vec<IvTick>, Error>, or decode chunk-by-chunk with .stream(handler).

Example

let rows = tdx
    .option_snapshot_greeks_implied_volatility("SPY", "20250321")
    .strike("570")
    .right("C")
    .await?;
for t in &rows {
    println!("date={} implied_volatility={} iv_error={}", t.date, t.implied_volatility, t.iv_error);
}

ThetaDataDxClient.option_snapshot_greeks_implied_volatility(
    symbol, expiration,
    *,
    strike=None, right=None, annual_dividend=None, rate_type=None,
    rate_value=None, stock_price=None, version=None, max_dte=None,
    strike_range=None, min_time=None, use_market_value=None, timeout_ms=None,
) -> list[IvTick]

option_snapshot_greeks_implied_volatility_async(...) awaits the same call shape.

Example

rows = tdx.option_snapshot_greeks_implied_volatility(
    "SPY",
    "20250321",
    strike="570",
    right="C",
)
for t in rows:
    print(t.date, t.implied_volatility, t.iv_error)

optionSnapshotGreeksImpliedVolatility(
  symbol: string, expiration: string | Date, options?: { ... },
): Promise<Array<IvTick>>

Optional parameters ride in a single trailing options object: strike?: string, right?: string, annualDividend?: number, rateType?: string, rateValue?: number, stockPrice?: number, version?: string, maxDTE?: number, strikeRange?: number, minTime?: string | Date, useMarketValue?: boolean, timeoutMs?: number.

Example

const rows = await tdx.optionSnapshotGreeksImpliedVolatility('SPY', '20250321', { strike: '570', right: 'C' });
for (const t of rows) {
  console.log(t.date, t.impliedVolatility, t.iVError);
}

std::vector<IvTick> option_snapshot_greeks_implied_volatility(
    const std::string& symbol,
    const std::string& expiration,
    const EndpointRequestOptions& options = {}) const;

Optional parameters chain on EndpointRequestOptions: .with_strike(...), .with_right(...), .with_annual_dividend(...), .with_rate_type(...), .with_rate_value(...), .with_stock_price(...), .with_version(...), .with_max_dte(...), .with_strike_range(...), .with_min_time(...), .with_use_market_value(...). Throws tdx::Error on failure.

Example

auto rows = client.option_snapshot_greeks_implied_volatility("SPY", "20250321",
    tdx::EndpointRequestOptions{}.with_strike("570").with_right("C"));
for (const auto& t : rows) {
    std::cout << t.date << ' ' << t.implied_volatility << ' ' << t.iv_error << "\n";
}

GET http://127.0.0.1:25503/v3/option/snapshot/greeks/implied_volatility

Served by the bundled server binary; responses stream as JSON, CSV, or NDJSON via the format parameter.

Example

curl -G 'http://127.0.0.1:25503/v3/option/snapshot/greeks/implied_volatility' \
    --data-urlencode 'symbol=SPY' \
    --data-urlencode 'expiration=2025-03-21' \
    --data-urlencode 'strike=570' \
    --data-urlencode 'right=C'

Parameters

Name	Type	Required	Default	Description
symbol	string	yes	—	Ticker symbol (e.g. AAPL)
expiration	date	yes	—	Expiration date YYYYMMDD
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. Accepted values: call, put, both.
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.
stock_price	float	no	—	Underlying price in dollars used in the Greeks calculation, overriding the observed underlying when set.
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
min_time	string	no	—	Minimum time filter
use_market_value	bool	no	false	When true, calculate Greeks against the option market value (mid-price) instead of the NBBO bid/ask pair.
timeout_ms	int	no	—	Per-request deadline in milliseconds. 0 means no deadline.

Response

Rows of IvTick:

Field	Type	Description
ms_of_day	i32	Milliseconds since midnight Eastern Time.
bid	f64	Last NBBO bid price.
bid_implied_volatility	f64	Implied volatility solved at the bid price.
midpoint	f64	Midpoint of the bid and ask prices.
implied_volatility	f64	Implied volatility solved from the option price.
ask	f64	Last NBBO ask price.
ask_implied_volatility	f64	Implied volatility solved at the ask 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).