Pricing

Pay per usage

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

Computes the Altcoin Season Index: what % of top-50 coins outperformed BTC over 90 days. Returns per-coin comparison, beat/miss flag, and aggregate score. Score ≥75 = altcoin season, ≤25 = BTC season. No API key required.

Pricing

Pay per usage

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Hojun Lee

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Altcoin Season Index

Track the Altcoin Season Index — what percentage of the top 50 cryptocurrencies outperformed Bitcoin over the last 90 days. The definitive indicator for crypto market cycle positioning. No API key required.

What Is Altcoin Season?

If 75% or more of the top 50 coins have outperformed Bitcoin over the last 90 days → Altcoin Season 🔥
If 25% or fewer have → Bitcoin Season ₿
Everything in between → Neutral/Mixed

This metric (popularized by blockchaincenter.net) is one of the most-watched cycle indicators in crypto trading.

What You Get

Per coin (dataset rows):

rank — market cap rank
symbol, name
change_90d_pct — 90-day price change (%)
btc_change_90d_pct — BTC's 90d change (the baseline)
beat_btc — true/false
outperformance_pct — how much the coin beat/missed BTC
market_cap_usd, current_price_usd

SUMMARY (key-value store):

altcoin_season_score — 0 to 100
season_label — altcoin_season / bitcoin_season / neutral
altcoins_beating_btc / altcoins_analyzed
top_5_outperformers — best performing altcoins vs BTC
bottom_5_underperformers — worst performing vs BTC

Sample Output

Dataset row:

{
  "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
}

SUMMARY:

{
  "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}
  ]
}

Input Parameters

Parameter	Type	Default	Description
`topN`	Integer	50	Number of top coins to analyze (10–250)
`excludeStablecoins`	Boolean	true	Remove USDT, USDC, DAI etc.
`excludeBtcWbtc`	Boolean	true	Exclude BTC and WBTC from altcoin set

Pricing

Pay-Per-Event: $0.003 per run

Each execution costs $0.003 regardless of how many coins you analyze.

No API Key Required

Data from CoinGecko's public API — free, no authentication required.

Use Cases

Cycle timing — rotate from BTC into alts when altcoin season starts
Portfolio allocation — increase altcoin exposure when score > 75
Market reports — track weekly altcoin season score over time
Trading bots — adjust strategy based on current market regime
Alerts — schedule this actor to detect season transitions

Technical Details

Runtime: Python 3.12 on Apify
Data source: CoinGecko /coins/markets (free tier)
Typical run time: ~10 seconds for top 50

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