---
title: "Altcoin Cycle Signal"
method: GET
path: "/v1/metrics/signals/altcoin_index"
---

# Altcoin Cycle Signal

`GET /v1/metrics/signals/altcoin_index`

**Definition.** The Altcoin Cycle Signal measures whether the market favors bitcoin versus all altcoins. It is based on price data of the top 250 altcoins by market capitalization (excluding stablecoins) and is meant to be largely agnostic to which altcoins in particular an investor holds.\n\n**Technical.** The metric is updated daily at 10:15 UTC, providing the previous day's data point at this time.\n\n**Interpretation.** During Bitcoin Season, bitcoin is likely to outperform the basket of all altcoins, during Altcoin Season this dynamic inverts.\n\n**Notes.** For more information on its interpretation and methodology, see [this dashboard](https://studio.glassnode.com/dashboards/signals).\n

[View in Studio](https://studio.glassnode.com/charts/signals.AltcoinIndex?a=BTC)

## Query parameters

- `a` string, required
- `s` integer
- `u` integer
- `i` string
- `f` 'csv' | 'json'
- `timestamp_format` 'unix' | 'humanized'

## Response `200`

Successful response

- TimeSeriesDataPoint[]
  - `t` integer — Unix timestamp
  - `v` union — Metric value (can be number, object, or array depending on the metric)
    - number
    - object
  - `o` object — Object containing multiple metric values (when applicable)

## Other responses

- `400` — Bad Request - Invalid parameters or unsupported asset
- `401` — Unauthorized - Invalid or missing API key
- `429` — Too Many Requests - Rate limit exceeded

---

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