Altcoin Season Index — Top 50 vs BTC 90-Day Performance

Altcoin Season Index tracks what percentage of the top 50 cryptocurrencies have outperformed Bitcoin over the last 90 days — the definitive crypto market cycle indicator. Returns the altcoin season score (0–100), season label, per-coin BTC outperformance, top 5 outperformers, and bottom 5 underperformers. Data from CoinGecko public API. No API key required. $0.003/run.

If 75%+ of the top 50 beat BTC → Altcoin Season. If 25% or fewer beat BTC → Bitcoin Season. This metric (popularized by blockchaincenter.net) is one of the most-watched cycle indicators in crypto.

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Why use Altcoin Season Index?

1. Cycle timing and capital rotation — Rotate from BTC into alts when the altcoin season score crosses 75. Rotate back when it falls below 40. This single metric captures market regime more reliably than price action alone.
2. Portfolio allocation automation — Use the season_label field (altcoin_season / bitcoin_season / neutral) as a rule-based trigger for dynamic rebalancing between BTC and altcoin exposure.
3. Weekly trend reporting — Schedule daily runs to track how the altcoin season score moves over time. A rising score from 40 → 65 over two weeks is a significant momentum signal even before it hits the 75 threshold.
4. Trading bot regime detection — Feed season_label and alt_season_probability directly into automated strategies to adjust position sizing, leverage, and altcoin selection based on current market regime.
5. Per-coin opportunity scanning — The top_5_outperformers and per-coin outperformance_pct fields identify which sectors and assets are leading the cycle — essential for targeted altcoin selection during alt season.

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How to use

1. Open the actor on Apify Store and click Try for free.
2. Set topN to the number of top coins to analyze (default: 50, range: 10–250).
3. Toggle excludeStablecoins and excludeBtcWbtc (both default to true).
4. Click Start — completes in ~10 seconds.
5. Check the SUMMARY key-value store for altcoin_season_score and season_label.
6. Schedule daily runs to build a time-series of altcoin season transitions.

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Input

Parameter	Type	Default	Description
topN	integer	50	Number of top coins to analyze (10–250)
excludeStablecoins	boolean	true	Remove USDT, USDC, DAI, and other stablecoins
excludeBtcWbtc	boolean	true	Exclude BTC and WBTC from the altcoin set

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Output

Per coin (dataset rows):

{
  "rank": 5,
  "symbol": "SOL",
  "name": "Solana",
  "change_90d_pct": 62.4,
  "btc_change_90d_pct": 18.2,
  "beat_btc": true,
  "outperformance_pct": 44.2,
  "market_cap_usd": 78500000000,
  "current_price_usd": 165.40
}

SUMMARY (key-value store):

{
  "altcoin_season_score": 68,
  "season_label": "neutral",
  "btc_change_90d_pct": 18.2,
  "altcoins_beating_btc": 34,
  "altcoins_analyzed": 50,
  "top_5_outperformers": [
    {"symbol": "SUI", "outperformance_pct": 112.5},
    {"symbol": "TAO", "outperformance_pct": 89.3}
  ],
  "bottom_5_underperformers": [
    {"symbol": "XRP", "outperformance_pct": -24.1}
  ]
}

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Cost estimation

Flat $0.003 per run regardless of topN.

Schedule	Monthly cost
Daily	$0.09
Twice daily	$0.18
Every 6 hours	$0.36
Hourly	$2.16

A full year of daily altcoin season tracking costs under $1.

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FAQ

What is the "Altcoin Season" threshold? ≥ 75% of the top 50 outperforming BTC = Altcoin Season. ≤ 25% = Bitcoin Season. 26–74% = Neutral. This definition matches the standard used by blockchaincenter.net.

Is the 90-day window configurable? Not currently — the actor uses the standard 90-day window that defines the official Altcoin Season Index. A shorter window (e.g. 30 days) would give different, more volatile signals.

Does it work with the top 100 or 200 coins? Yes — set topN: 100 or topN: 200. Larger sets include more small-caps which can amplify the score in either direction. The standard index uses top 50.

Can I get the full coin-by-coin breakdown? Yes — each coin is a separate dataset row with beat_btc, outperformance_pct, and market data. Filter by beat_btc: true for the full list of outperformers.

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Related actors

• BTC Dominance Tracker — 15 dominance analytics including alt_season_probability to complement this index
• Altcoin BTC-Relative Performance — Deeper per-pair alt season signal (488+ pairs vs BTC) for portfolio construction
• CoinMarketCap Global Metrics — Total market cap + Fear & Greed for macro context alongside the altcoin season score

Feedback

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