Crypto Sentiment Aggregator

Aggregates current sentiment indicators for major cryptocurrencies, including the Crypto Fear & Greed Index, social mention volume, and price-action-derived signals. Data is sourced from public APIs and refreshed on a short cache interval.

Sentiment is a contrarian indicator for many traders: extreme fear historically correlates with local price bottoms, extreme greed with tops.

Market sentiment in cryptocurrency is measured through a basket of derived indicators rather than a single number. The Alternative.me Crypto Fear & Greed Index is the most widely referenced composite, published daily on a 0-100 scale. Components include 25% volatility (current vs. 30/90-day averages), 25% market momentum/volume, 15% social media mentions and sentiment, 15% Bitcoin dominance (rising dominance suggests fear, falling suggests altcoin speculation), 10% Google Trends searches, and 10% surveys. The composite below 25 is labeled 'extreme fear', 75-100 'extreme greed', with the center range neutral.

A worked example: during the early 2024 rally to $73K Bitcoin, the index reached 89 (extreme greed) for several weeks in March, then dropped to 36 (fear) during the May correction to $58K. The 2022 bear-market low (Bitcoin $15.5K in November after FTX collapse) corresponded to an index reading of 6, the lowest on record. Historically, sustained extreme readings (above 80 or below 25 for multiple weeks) have aligned with local market turning points, which is the basis for the contrarian-indicator interpretation: extreme greed warns of overheating, extreme fear of capitulation.

Limitations of sentiment as a trading signal are well documented. The index is a lagging-coincident composite of price action and crowd behavior, not a leading indicator. Reading 'extreme greed' tells you the market has already moved up significantly; it doesn't predict reversal timing. Combining sentiment with on-chain metrics (exchange flows, miner behavior, long-term holder behavior, MVRV ratios) and macro context (Fed policy, dollar strength, broader risk asset performance) produces more actionable signal than sentiment alone. Plenty of bull markets sustained 'extreme greed' readings for months without correcting; plenty of bear markets sustained 'extreme fear' before further declines.

The page caches API results for about 60 seconds to balance freshness against rate-limit constraints from upstream sources. Per-coin sentiment for smaller assets is noisier because mention volume is lower; the composite index covers Bitcoin and Ethereum primarily, with broader 'altcoin season' indicators tracking performance breadth across the top 50 by market cap. Real-time sentiment streams (LunarCrush, Santiment, Nansen) provide finer granularity at higher cost.

For most retail users, sentiment data is informational context rather than a standalone decision input. The single most important question to ask is 'what does my position look like at extreme readings on either end' rather than 'should I trade based on sentiment'.