Real-time crypto market sentiment index with free public API. Binance-grade methodology. No signup required.
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Our crypto Fear & Greed Index uses a proprietary algorithm to analyze multiple market factors and generate a comprehensive sentiment score.
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.
The live index is updated approximately every minute. Historical data is aggregated into 5-minute and 1-hour intervals for trend analysis.
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.
Access real-time and historical crypto sentiment data through a simple REST API. No keys, no signup, no strict rate limits.
GET /v1/latestReturns the current Fear & Greed value, previous value, timestamp, and BTC price context.
Example response
{
"timestamp": "...",
"actual_value": 65.61,
"previous_value": 65.58,
"bitcoin_price_usd": 96735,
"previous_bitcoin_price_usd": 96741
}GET /v1/history/5min?hours=24Returns 5-minute aggregated index and BTC price data. The maximum value for hours is 192.
Example response
[
{
"interval_end_time": "...",
"open_actual_value": 56.12,
"avg_actual_value": 56.15,
"close_bitcoin_price_usd": 96735
}
]async function getLatestIndex() {
const response = await fetch('https://api.coinybubble.com/v1/latest');
if (!response.ok) {
throw new Error(`HTTP error ${response.status}`);
}
return response.json();
}Explore the OpenAPI specification or use the interactive Swagger UI to test endpoints and inspect response fields.
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.
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.
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.
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.
The live index data /v1/latest is typically updated every minute. The historical endpoints /v1/history/... reflect data aggregated over 5-minute or 1-hour intervals, based on these live updates.
In the history endpoints /5min and /1hour, OHLC stands for Open, High, Low, Close:
Check the API documentation for exact response fields. The chart uses the close or average index value and the close BTC price.
We value your feedback! Please send an email to [email protected]. We aim to continuously improve the service based on user input.
CoinyBubble Index exists because essential market sentiment data should be easy to inspect, cite, and build with. It gives traders, developers, and researchers a reliable Fear & Greed signal without account gates.
The methodology is designed to track the behavior of established crypto sentiment indices while keeping the data simple enough for dashboards, bots, and research workflows.
The public index and API stay free. Donations help cover infrastructure, monitoring, and new endpoints requested by the community.
Your support keeps the API fast, available, and open for builders who need sentiment data without procurement or signup friction.
Keep the API and index available for everyone.
Fund uptime monitoring and resilient hosting.
Add useful analytics and visualization endpoints.
Support attribution-friendly crypto sentiment data.
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