---
title: "Classification band distribution over a lookback window"
method: GET
path: "/api/v1/crypto/fear-greed/classification-breakdown"
tags: ["Crypto"]
---

# Classification band distribution over a lookback window

`GET /api/v1/crypto/fear-greed/classification-breakdown`

Server-side aggregation over the last N days of Alternative.me Fear & Greed Index observations. Returns one count per classification band (Extreme Fear, Fear, Neutral, Greed, Extreme Greed), the arithmetic mean of the raw 0-100 value, and the inclusive period bounds. Useful for monitoring regime shifts without processing the full series.

## Query parameters

- `days` integer — Lookback window in days. Upstream provides one observation per UTC day, so `days` also equals the number of observations aggregated.

## Response `200`

Per-band counts, average value, and the inclusive period bounds.

- EnvelopeFearGreedBreakdownPayload
  - `data` FearGreedBreakdownPayload, required — Distribution of Fear & Greed classification bands over a lookback window.
    - `name` string — Upstream index label as published by Alternative.me.
    - `days` integer, required — Lookback window in days, as supplied by the caller.
    - `extreme_fear` integer, required — Number of observations in the `Extreme Fear` band (0-24) within the window.
    - `fear` integer, required — Number of observations in the `Fear` band (25-49) within the window.
    - `neutral` integer, required — Number of observations in the `Neutral` band (50-54) within the window.
    - `greed` integer, required — Number of observations in the `Greed` band (55-74) within the window.
    - `extreme_greed` integer, required — Number of observations in the `Extreme Greed` band (75-100) within the window.
    - `average_value` number, required — Arithmetic mean of the raw `value` across all observations in the window.
    - `period_start` string, required — ISO 8601 UTC timestamp of the oldest observation included in the aggregation (earliest midnight in the window).
    - `period_end` string, required — ISO 8601 UTC timestamp of the newest observation included in the aggregation (latest midnight in the window).
    - `count` integer, required — Total number of observations included in the aggregation (equal to the sum of all bands).
  - `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)