Crypto Fear & Greed Index
Real-time crypto market sentiment index with free public API. Binance-grade methodology. No signup required.
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How the Index Is Calculated
Our crypto Fear & Greed Index uses a proprietary algorithm to analyze multiple market factors and generate a comprehensive sentiment score.
Binance-Grade Methodology
Our index is calculated using a proprietary formula designed to be virtually identical to Binance's Fear & Greed index methodology, providing a highly accurate reflection of crypto market sentiment.
Key Factors Considered
- Market volatility analysis
- Trading volume analysis
- Social media sentiment
- Market momentum
- Bitcoin dominance
- Survey data (where applicable)
Data Aggregation & Updates
The live index is updated approximately every 1 minutes. Historical data is aggregated into 5-minute and 1-hour intervals for trend analysis.
Index Scale Explained (0-100)
Indicates widespread fear, potential oversold market, possible buying opportunity.
Suggests market uncertainty and caution among investors.
Shows growing market confidence, potential FOMO (Fear Of Missing Out).
Implies excessive optimism, market may be due for a correction.
Free Open API
Access real-time and historical crypto sentiment data via our simple RESTful API. No keys, no sign-up, no strict rate limits. Perfect for traders, developers, and researchers.
Get Latest Index Data
Returns the most recent F&G index value, its previous value, and corresponding BTC prices.
Example Response:
Get Historical Data
Returns 5-min aggregated data for index and BTC price. Max `hours` = 192 (8 days).
Example Response:
Code Example
// Fetch latest index data with JavaScript
async function getLatestIndex() {
try {
const response = await fetch('https://api.coinybubble.com/v1/latest');
if (!response.ok) throw new Error(`HTTP error ${response.status}`);
const data = await response.json();
return data;
} catch (error) {
console.error('Failed to fetch latest index:', error);
return null;
}
}API Documentation
Explore the complete OpenAPI specification or use the interactive Swagger UI documentation for detailed endpoint information and testing.
Frequently Asked Questions
Is this service really free?
Yes, absolutely! The CoinyBubble Index and its API are completely free to use. Our goal is to provide valuable crypto market sentiment data to traders and developers without any cost barriers.
Can I use this in my commercial project?
Yes, you are welcome to use our API data in any project, including commercial applications. We simply ask that you provide attribution to CoinyBubble (e.g., "Data provided by CoinyBubble.com") where feasible.
Are there any usage limits (rate limits)?
We currently do not enforce strict rate limits, but we monitor usage to ensure fair access for everyone. Please use the API responsibly. For high-volume applications, implement caching on your end to avoid excessive requests. If you anticipate very high usage, please contact us.
How accurate is the index compared to others?
Our index is calculated using a methodology designed to closely mirror Binance's Fear & Greed Index, a widely recognized benchmark. We continuously monitor and refine our calculations for accuracy and relevance in the current market.
How often is the data updated?
The live index data (`/v1/latest`) is typically updated every 1 minute. The historical endpoints (`/v1/history/...`) reflect data aggregated over 5-minute or 1-hour intervals, based on these live updates.
What do the OHLC values in the history represent?
In the history endpoints (`/5min`, `/1hour`), OHLC stands for Open, High, Low, Close:
- Open Value/Price: The index value or BTC price at the *start* of the interval (e.g., `open_actual_value`, `open_bitcoin_price_usd`).
- High Value/Price: The *highest* index value or BTC price recorded *during* the interval (e.g., `high_value` for index - if provided by API, `high_bitcoin_price_usd`).
- Low Value/Price: The *lowest* index value or BTC price recorded *during* the interval (e.g., `low_value` for index - if provided by API, `low_bitcoin_price_usd`).
- Close Value/Price: The index value or BTC price at the *end* of the interval (e.g., `close_actual_value`, `close_bitcoin_price_usd`).
- Avg Value: The average index value calculated over the interval (e.g., `avg_actual_value`).
Note: Field names like `high_value` and `low_value` for the index itself might not be present in all API responses; check the API documentation for specifics. The chart currently uses `avg_actual_value` or `close_actual_value` for the index line and `close_bitcoin_price_usd` for the price line.
How can I report issues or suggest improvements?
We value your feedback! Please send an email to [email protected]. We aim to continuously improve the service based on user input.
About & Support CoinyBubble
CoinyBubble Index was born from a passion for cryptocurrencies and the belief that essential market data should be freely accessible. Created by an independent developer, our mission is to provide a reliable, real-time, and easy-to-use crypto market sentiment index (Fear & Greed) for traders, developers, and enthusiasts.
We strive for accuracy by employing a methodology similar to established indices like Binance's, ensuring our data offers meaningful insights into market psychology.
This project is offered free of charge. We believe democratizing access to data like the Fear & Greed Index helps create a more informed and potentially more balanced trading environment for everyone. Your feedback and responsible usage help keep this service running.
Support the Project
CoinyBubble is committed to keeping this Fear & Greed Index and API free and open. Your donations help cover server costs, maintain high availability, and add new features based on community feedback.
Maintain Free Access
Keep the API and index tools free for everyone to use
High Availability
Ensure 24/7 uptime and fast response times
New Features
Develop advanced analytics and visualization tools
Support Community
Foster an open crypto data ecosystem
Donate Crypto
Bitcoin (BTC)
Ethereum (ETH + USDT)
Solana (SOL + USDT)
Start Using the Index Today
Integrate real-time crypto market sentiment into your trading strategy, application, or analysis workflow in minutes. It's free, open, and requires no signup.