Perception Index · updated every 15 minutes
Bitcoin Fear & Greed Index
The Perception Index scores the tone of digital asset coverage across the sources Perception tracks. 50 means sources are at their usual tone. Compare dates and follow the sources behind a change.
- Latest reading
- 57/100
- Status
- Optimism
- Vs previous day
- +1
- Date
- Oct 4, 2026
See the Fear & Greed reading during ten market events, or the track record behind this index.
Perception Index and Bitcoin price
Daily readings, last 30 days
Snapshots
Sentiment timeline
- Latest
- 57OptimismOct 4, 2026
- Previous day
- 56OptimismOct 3, 2026
- 7 days earlier
- 63OptimismSep 27, 2026
- 1 month earlier
- 62OptimismSep 4, 2026
- 3 months earlier
- 47NeutralJul 6, 2026
Methodology
How the index is calculated
The index summarizes classified mentions. Read the source period, the source groups, and the calculation method beside the score.
The calculation
Full methodology- 01
Every 15 minutes, mentions from the last 24 hours are classified as positive, neutral, or negative.
- 02
Each source group's positive share is compared with its own 90-day norm, so a naturally upbeat channel such as press releases does not lift the score.
- 03
The groups are weighted by source type and volume into one score from 0 to 100. 50 means sources are at their usual tone.
- 04
The published score is smoothed, and a single day can move it by at most 12 points.
Source groups now
Updated Oct 4, 15:00 UTC
Institutional · Financial media
62Macro · Mainstream media
57Crypto native · Crypto media and communities
45Social · Social media and LinkedIn
53Regulatory · SEC filings
50Technical · Code repositories
49
Each bar runs 0 to 100; the tick marks 50, the group’s usual tone. 2,073 articles scored in the last 24 hours.
Last 24 days
- Sep 11, 2026: 49
- Sep 12, 2026: 36
- Sep 13, 2026: 38
- Sep 14, 2026: 46
- Sep 15, 2026: 38
- Sep 16, 2026: 38
- Sep 17, 2026: 56
- Sep 18, 2026: 62
- Sep 19, 2026: 62
- Sep 20, 2026: 56
- Sep 21, 2026: 71
- Sep 22, 2026: 77
- Sep 23, 2026: 77
- Sep 24, 2026: 71
- Sep 25, 2026: 60
- Sep 26, 2026: 71
- Sep 27, 2026: 63
- Sep 28, 2026: 55
- Sep 29, 2026: 67
- Sep 30, 2026: 74
- Oct 1, 2026: 63
- Oct 2, 2026: 58
- Oct 3, 2026: 56
- Oct 4, 2026: 57
Score ranges
What each score range means
The same five bands the Perception app uses. Ranges summarize the tone of the selected mentions; open the underlying sources for context.
- 0-30
Extreme Pessimism
Negative coverage outweighs each source group's usual tone by a wide margin.
5 of the last 90 days
- 31-45
Pessimism
Negative classifications outweigh the usual mix across source groups.
27 of the last 90 days
- 46-55
Neutral
Coverage sits close to each source group's 90-day norm.
20 of the last 90 days
- 56-70
Optimism
Positive classifications outweigh the usual mix across source groups.
32 of the last 90 days
- 71-100
Extreme Optimism
Positive coverage outweighs each source group's usual tone by a wide margin.
6 of the last 90 days
Developer integration
Use the index in your workflow
Query the public index endpoint or embed the chart in your site.
Grab the API
Perform a simple GET request. No authentication or signup required.
GET https://api.perception.to/indexcurl https://api.perception.to/index
EMBEDDABLE WIDGET
Put the index on your own site
Two lines of HTML. The cards below are the real widget, reading the same live endpoint your embed will.
HTML snippet
<!-- 1. Where the widget renders --> <div class="perception-index-widget"></div> <!-- 2. The script --> <script src="https://perception.to/widgets/perception-index.js" defer></script>
| Attribute | Options | Default | Description |
|---|---|---|---|
data-theme | "light" | "dark" | "light" | Visual theme of the card. |
data-drivers | "true" | "false" | "true" | Show the per-sector driver breakdown under the score. |
Feature comparison
Perception index vs Alternative.me
Compare the published inputs and open each provider’s methodology.
| Feature | Perception Index | Alternative.me F&G |
|---|---|---|
| Inputs | Classified source mentions | Market activity and attention indicators |
| Reading context | Source period and sentiment classifications | Provider-defined component weights |
| Public API | Public index endpoint | Public /fng/ endpoint |
Read the index in context
Fear & Greed historical events
Ten market events, from the March 2020 crash to Bitcoin crossing $100,000, with the Crypto Fear & Greed reading on the day.
Track record
How much of each index is trailing price, the measured lead on sentiment shifts, and the null result we publish anyway.
Daily sentiment archive
A daily Bitcoin sentiment reading for every day since February 2018, with the mentions behind each score.
Integrations
Follow the mentions behind a change
Use Perception in your AI, or configure watchlist notifications through an eligible plan.
Watchlist alerts via Slack
Eligible connected workspaces are checked for watchlist matches every 15 minutes.
Daily email digests
Formatted reports summarizing media allocations and narrative shifts.
REST API and MCP
Query sentiment and source context inside your AI or application.
FAQ
Frequently asked questions
What is the Bitcoin Market Sentiment Index?
The Perception Index scores the tone of digital asset coverage across the sources Perception tracks, from 0 (extreme pessimism) to 100 (extreme optimism). A Bitcoin-only version is available from the same API with scope=bitcoin.
How is the Market Sentiment Index calculated?
Mentions are classified as positive, neutral, or negative. Each source group's positive share is compared with its own 90-day norm, then the groups are weighted by source type and volume into one score. 50 means sources are at their usual tone.
How often is the Market Sentiment Index updated?
The index recalculates every 15 minutes over a trailing 24-hour window. Check the date displayed beside the reading when you cite it.
What does extreme pessimism (0-30) indicate?
A low reading means negative classifications outweigh each source group's usual mix by a wide margin. Open the sources to inspect the themes and events behind it.
What does extreme optimism (71-100) indicate?
A high reading means positive classifications outweigh each source group's usual mix by a wide margin. Inspect the source mix and reporting period before interpreting the result.
How is Perception different from the Alternative.me Fear & Greed Index?
Perception summarizes classified mentions. Alternative.me publishes a composite of market and attention inputs, including volatility, momentum, social activity, dominance, and search trends. Its methodology lists surveys as paused.
Can I get alerts when sentiment changes?
Eligible Perception plans include watchlist notifications through configured email or Slack connections. Delivery depends on the rule, matching data, and notification settings.
Is there an API for the Market Sentiment Index?
The public index endpoint is available without authentication at https://api.perception.to/index. MCP provides a separate way to query Perception from your AI client.
What is sentiment velocity?
Sentiment velocity describes the change in a sentiment measure over a defined period. Read the period and source data alongside the change.
Open the sources behind every move
Use Perception in your AI, or set up watchlist notifications by email or Slack on an eligible plan.
Important disclosure
The Bitcoin Market Sentiment Index provides market sentiment analysis for informational purposes only and does not constitute financial, investment, or trading advice. Past performance does not guarantee future results. Always conduct your own research.