Select one contract by closest delta (no full-chain download)
Returns the single contract whose delta is CLOSEST to the requested target on the requested expiry - the 'which strike is the 25-delta call' answer as one small response instead of the ~256 KB full chain plus a client-side search. Delta is SIGNED: positive selects from calls, negative from puts; the optional right parameter must agree with the sign when given. Contracts whose implied volatility fails the shared plausibility gate (including the upstream's literal 0.0 no-data marker, API-1.8) or that carry no usable delta are EXCLUDED before selection and disclosed in the dropped_* counters, so a gated chain can never silently select an empty contract. Error codes match /snapshot: unknown_symbol, expiry_not_in_snapshot, snapshot_not_available.
Path parameters
Underlier ticker.
Underlier ticker.
Query parameters
Expiry to select from (YYYY-MM-DD). Required - delta targeting is per-expiry.
Expiry to select from (YYYY-MM-DD). Required - delta targeting is per-expiry.
Target delta, SIGNED: calls in (0, 1), puts in (-1, 0). 0.25 = the 25-delta call; -0.25 = the 25-delta put.
Target delta, SIGNED: calls in (0, 1), puts in (-1, 0). 0.25 = the 25-delta call; -0.25 = the 25-delta put.
Optional side. When given it must agree with the delta sign; when omitted the sign decides.
Optional side. When given it must agree with the delta sign; when omitted the sign decides.
Optional snapshot date (YYYY-MM-DD). Defaults to the latest cycle.
Optional snapshot date (YYYY-MM-DD). Defaults to the latest cycle.
Response
The closest-delta contract + selection disclosure.
Example response
{
"data": {
"symbol": "SPY",
"option_type": "C",
"target_delta": 0.25,
"contract": {
"strike": 180,
"last_price": 8.45,
"volume": 12450,
"open_interest": 45230,
"implied_volatility": 0.2412,
"contract_symbol": "AAPL260606C00180000",
"last_trade_date": "2026-05-19T20:00:00Z",
"option_type": "C",
"greeks_source": "yahoo_iv_bs_calc_zero_div"
}
},
"meta": {
"endpoint": "/api/v1/fred/us/cpi",
"data_time": "2026-04-16T14:30:00Z",
"response_time": "2026-04-16T14:30:12Z",
"provider": "Sugra API v1.0.1",
"source": "sugra_crypto",
"attribution": "Short interest and Reg SHO daily short volume data is owned by and sourced from FINRA (Financial Industry Regulatory Authority).",
"fallback_chain": [
"sugra_crypto",
"sugra_finance"
]
}
}