---
title: "Precomputed IV surface + term structure for one underlier"
method: GET
path: "/api/v1/options/{symbol}/iv-surface"
tags: ["Options"]
---

# Precomputed IV surface + term structure for one underlier

`GET /api/v1/options/{symbol}/iv-surface`

Returns the precomputed implied-volatility surface (strike x expiry grid as call_iv_skew + put_iv_skew per expiry) and the ATM-IV term structure for the requested underlier. Computed during the ingest cycle and stored on the snapshot payload (saves API hot-path compute). Defaults to the latest cycle; pass ``?date=YYYY-MM-DD`` to read a historical surface. ``date`` must lie within the 90-day retention window.

## Path parameters

- `symbol` string, required — Underlier ticker.

## Query parameters

- `date` string, nullable — Optional snapshot date (YYYY-MM-DD). Defaults to the latest cycle.

## Response `200`

IV surface payload.

- EnvelopeOptionsIvSurfacePayload
  - `data` OptionsIvSurfacePayload, required — Response payload for ``/options/{symbol}/iv-surface``.
    - `symbol` string, required — Underlier ticker.
    - `snapshot_date` string, required — Snapshot date used for the surface.
    - `underlier_price` number, nullable — Underlier spot price.
    - `surface` IvSurfaceRow[] — Per-expiry IV surface rows.
      - `expiration_date` string, required — ISO expiration date.
      - `days_to_expiration` integer, nullable
      - `atm_iv` number, nullable — At-the-money implied volatility.
      - `atm_strike` number, nullable — Strike used for ATM IV reading.
      - `call_iv_skew` IvSkewRow[] — Call-side skew.
        - `strike` number, required — Strike price.
        - `iv` number, nullable — Implied volatility at this strike.
        - `moneyness` number, nullable — ln(K / S) or similar moneyness measure.
      - `put_iv_skew` IvSkewRow[] — Put-side skew.
        - `strike` number, required — Strike price.
        - `iv` number, nullable — Implied volatility at this strike.
        - `moneyness` number, nullable — ln(K / S) or similar moneyness measure.
    - `term_structure` TermStructureRow[] — ATM IV across expiries.
      - `days_to_expiration` integer, nullable
      - `atm_iv` number, nullable
    - `greeks_source` string, nullable — Greeks source for the underlying snapshot.
  - `meta` SugraMeta, required — Metadata attached to every /api/v1/* response envelope.
    - `endpoint` string, required — Requested endpoint path.
    - `data_time` string, required — ISO 8601 UTC timestamp of the source data, not of the request.
    - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced.
    - `provider` string, required — API name and version.
    - `source` string, nullable — Identifier of the primary upstream source used for this response.
    - `attribution` string, nullable — Human-readable attribution mandated by an upstream source (e.g. a securities regulator or self-regulatory organization). Present only on responses whose source requires the owner and source to be clearly identified. Do not remove or alter it when using the response.
    - `fallback_used` boolean, nullable — True when the primary source failed and a fallback produced the data.
    - `fallback_chain` string[], nullable — Ordered list of sources attempted, in the order they were tried.
    - `cached` boolean, nullable — True when this response was served from the internal cache.
    - `stale` boolean, nullable — True when the cached response was returned after the upstream rate-limited or errored. Clients can use this to detect degraded data.

## Other responses

- `401` — Missing or invalid `x-api-key` header.
- `422` — Validation Error
- `429` — Daily rate limit exceeded. Check `X-RateLimit-Reset` for the next window.
- `503` — Upstream source is temporarily unavailable. Retry after a short delay.

---

[API](https://skmtc.net/sugra/apis/sugra-api.md) · [All operations](https://skmtc.net/sugra/apis/sugra-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/sugra/sugra-api/versions/4e2740743eb4/schema)