Delta-based 25-delta skew + ATM IV for one expiry

GET

/api/v1/options/{symbol}/skew

Last modified:2026-08-23 21:30:26

Maintainer:Not configured

OperationId:options_symbol_skew

25-delta skew computed IN DELTA SPACE from the snapshot's contract deltas: implied volatility is linearly interpolated at call delta +0.25 and put delta -0.25 between the adjacent bracketing contracts, and skew_25d = iv_put_25d - iv_call_25d (positive = downside protection priced over upside). The raw call_iv_skew/put_iv_skew strike rows of /iv-surface are the strike-space INPUT view; this endpoint answers in the delta convention practitioners quote. Contracts failing the shared IV plausibility gate (API-1.8) or missing a delta are excluded and counted - the literal-0.0 IV marker never enters the formula. A target outside the reliable chain's delta range yields null, never an extrapolated number. Defaults to the nearest expiry; error codes match /snapshot.

Request

Path Params

Query Params

Header Params

Request Code Samples

Shell

JavaScript

Java

Swift

PHP

Python

HTTP

Objective-C

Ruby

OCaml

Dart

curl --location 'https://sugra.ai/api/v1/options//skew?expiry=undefined&date=undefined' \
--header 'x-api-key:   ABCD314159'

Responses

🟢200OK

application/json

25d skew + ATM IV payload.

Bodyapplication/json

Example

{
    "data": {
        "symbol": "SPY",
        "snapshot_date": "string",
        "underlier_price": 0,
        "expiry": "string",
        "atm_iv": 0,
        "iv_call_25d": 0,
        "iv_put_25d": 0,
        "skew_25d": 0,
        "call_25d_source": "string",
        "put_25d_source": "string",
        "contracts_used_calls": 0,
        "contracts_used_puts": 0,
        "dropped_unreliable_iv": 0,
        "dropped_missing_delta": 0
    },
    "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": "string",
        "attribution": "string",
        "fallback_used": true,
        "fallback_chain": [
            "string"
        ],
        "cached": true,
        "stale": true
    }
}

🟠401Unauthorized

🟠422Parameter Error

🟠429

🔴503Service Unavailable

Modified at 2026-08-23 21:30:26

Select one contract by closest delta (no full-chain download)

IV rank + percentile of current ATM IV vs the snapshot history