---
title: "Single-expiry IV smile"
method: GET
path: "/options/iv/smile"
tags: ["Options"]
---

# Single-expiry IV smile

`GET /options/iv/smile`

## Request

- Base URL: `https://docs.backquant.com/v2`
- URL: `https://docs.backquant.com/v2/options/iv/smile`
- Auth: API key in header `X-API-Key`

Implied volatility by strike for one expiry — the cheap path when you only need a single tenor. Pass `?expiry=` as a Deribit-style token (e.g. `28MAR25`); omit it to receive the default front-month smile from `iv:smile:{symbol}:default`. The lookup is case-insensitive on the token; if neither cased form exists, this returns 404 with the available tokens hinted in the error.

## Query parameters

- `symbol` 'BTCUSDT' | 'ETHUSDT' | 'SOLUSDT' | 'HYPEUSDT': Trading symbol: BTCUSDT, ETHUSDT, SOLUSDT, or HYPEUSDT.
- `expiry` string, nullable: Expiry token (e.g. `28MAR25`). Omit for the default front-month smile.

## Headers

- `X-API-Key` string, nullable

## Response `200`

Successful Response

- unknown

## Other responses

- `401`: Invalid or missing API key
- `404`: No data available for the requested resource
- `422`: Validation error on query parameters
- `429`: Rate limit exceeded

---

[API](https://skmtc.dev/backquant/apis/backquant-api-v2.md) · [All operations](https://skmtc.dev/backquant/apis/backquant-api-v2/llms.txt) · [OpenAPI document](https://skmtc.dev/backquant/apis/backquant-api-v2/revisions/3c1c96b3cc24?raw)