---
title: "Option chain snapshot"
method: GET
path: "/v1/underlying/{ticker}/chain"
tags: ["Underlying"]
---

# Option chain snapshot

`GET /v1/underlying/{ticker}/chain`

Snapshot of the option chain for a single expiration on the
requested date — call & put volume, premium, OI, last IV, and
last trade price per strike, plus the underlying price.

## Path parameters

- `ticker` string, required

## Query parameters

- `expiration` string, date, required
- `min_volume` integer
- `date` string, date

## Response `200`

Chain snapshot.

- ChainSuccess
  - `data` ChainResponse, required
    - `ticker` string, required
    - `expiration` string, date, required
    - `underlyingPrice` number, double, required
    - `strikes` ChainItem[], required
      - `strike` number, double, required
      - `callVolume` integer, required
      - `callPremium` number, double, required
      - `callOi` integer, required
      - `callIv` number, double, nullable — Last call-side IV in the bucket. May be null when no quotes are available.
      - `callLastPrice` number, double, required
      - `putVolume` integer, required
      - `putPremium` number, double, required
      - `putOi` integer, required
      - `putIv` number, double, nullable
      - `putLastPrice` number, double, required
  - `meta` Meta, required
    - `timestamp` string, date-time, required — Server-side timestamp the response was generated at.
    - `requestId` string, required — Short opaque ID for log correlation.

## Other responses

- `400` — Request validation failed.
- `401` — Missing or invalid API key.
- `402` — The account's shared Skylit credit balance is lower than this route's cost. Top up to continue. Carries `X-Credits-Remaining: 0`.
- `404` — Unknown resource (ticker / sector / window with no data).
- `429` — Per-minute rate limit exceeded.

---

[API](https://skmtc.net/skylit/apis/flowseeker-skylit-public-api.md) · [All operations](https://skmtc.net/skylit/apis/flowseeker-skylit-public-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/skylit/flowseeker-skylit-public-api/revisions/3280190b1b24/schema)