Sentiment Index

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Sentiment Index API

Market sentiment data,
straight into your code.

The official Sentiment Index API gives you 20 endpoints across 6 categories: the Fear and Greed Index, institutional 13F holdings, gamma exposure, earnings, screeners and supply-chain research. Every number behind the site, over plain REST.

Get your API keyRead the docsPlans & pricing
curl https://api.sentimentindex.io/v1/fear-greed \
  -H "Authorization: Bearer $SENTIMENT_API_KEY"
Response
{
  "as_of": "2026-08-29",
  "current": 46,
  "zone": "Neutral",
  "previous_close": 41,
  "indicators": {
    "market_momentum": 52.4,
    "stock_price_strength": 38.1,
    "put_call_options": 61.7,
    "market_volatility": 44.9
  }
}
20REST endpoints
6Data categories
JSONand CSV responses
99.9%Uptime target
Fear & Greed

The index that drives the whole platform.

One call returns today's reading, the zone it falls in, the previous close and the underlying indicators: market momentum, stock price strength, put/call options and market volatility. The same series the gauge on our homepage is drawn from, with no scraping and no rate-limit games.

GET /v1/fear-greed
/v1/fear-greed
54Neutralas of 2026-08-28
  • Previous close54
  • 1 week ago55
  • 1 month ago38
  • 3 months ago61
  • 1 year ago64
Institutional

Follow the smart money, filing by filing.

Pull 13F filings by institution and quarter: every position, the change since last quarter, portfolio weight and total reported value. Cross-reference an ETF's constituent holdings with the same call pattern to see who owns what.

GET /v1/hedge-funds/{cik}
/v1/hedge-funds
Example response, top holdings by weight
TickerWeightChangeValue
NVDA8.42%+12.1%$4.10B
MSFT6.88%+2.4%$3.35B
AAPL5.91%-3.8%$2.88B
AMZN4.20%+7.6%$2.05B
META3.14%-1.2%$1.53B
Exposure and events

Gamma exposure, implied moves and the calendar.

Dealer gamma by strike and expiration for SPY, the options-implied move into any ticker's next earnings print, and the full earnings calendar with estimates. The positioning data that shows where the market is pinned before the move happens.

GET /v1/spy-gex
/v1/spy-gex

20 endpoints across 6 categories

Every endpoint returns JSON, authenticates with a bearer token and is rate limited per plan.

Sentiment

3
  • GET/v1/fear-greed

    Daily Fear and Greed Index readings with the underlying indicators.

  • GET/v1/fear-greed/csv

    The same series as CSV, for spreadsheets and backtests.

  • GET/v1/popular-stocks

    The tickers drawing the most attention on the platform right now.

Market data

5
  • GET/v1/prices

    OHLC price candles for any US-listed ticker.

  • GET/v1/stock-chart

    Chart-ready price series with technical overlay values.

  • GET/v1/stock-profile

    Company profile, sector, market cap and key fundamentals.

  • GET/v1/stock-search

    Ticker and company-name search across the covered universe.

  • GET/v1/ticker-tape

    Live quotes for the index, sector and commodity instruments.

Screeners & maps

4
  • GET/v1/screener

    Screen the market by fundamentals, performance and technicals.

  • GET/v1/stock-map

    Treemap data: every covered stock by cap, sector and performance.

  • GET/v1/chart-metrics

    Any two metrics across the universe, for scatter and regression work.

  • GET/v1/company-world-map

    Company headquarters and operating geography by ticker.

Institutional

3
  • GET/v1/hedge-funds

    13F filings by institution, quarter by quarter.

  • GET/v1/hedge-funds/{cik}

    A single filer's holdings, position changes and total value.

  • GET/v1/etf-holdings

    Constituent holdings and weights for any covered ETF.

Exposure

2
  • GET/v1/spy-gex

    Dealer gamma exposure by strike and expiration for SPY.

  • GET/v1/implied-move

    Options-implied move into a ticker's next earnings date.

Events & research

3
  • GET/v1/earnings-calendar

    Upcoming and historical earnings dates with estimates.

  • GET/v1/research/catalysts

    Dated catalysts and events on a ticker's calendar.

  • GET/v1/research/supply-chain

    Suppliers and customers mapped for a given company.

Flexible data access

REST API

Simple GET requests for real-time and historical data.

  • JSON responses
  • Bearer authentication
  • Per-plan rate limiting
  • Full reference docs

CSV exports

Bulk downloads for backtesting and spreadsheet work.

  • Full history in one file
  • Same schema as JSON
  • Streamed for large ranges
  • Pro plan

MCP server

Connect your AI assistant straight to the data.

  • Works with Claude and Cursor
  • Natural language queries
  • Same key as REST
  • Pro plan

Plans & pricing

Start free, upgrade when you need the full history and the institutional endpoints.

API Free

For hobby projects and evaluation

Free

No card required, no expiry

Get your key
  • Fear and Greed Index, daily readings
  • Market data: prices, profiles, search
  • Earnings calendar and upcoming events
  • 90 day historical lookback
  • 1,000 requests per day
  • Screeners, stock maps and chart metrics
  • 13F institutional and ETF holdings
  • SPY gamma exposure and implied move
  • Supply chain and catalyst research
  • CSV bulk exports
  • MCP server support
  • Email support
Most popular

API Pro

For individual developers and traders

$20/mo

Billed monthly, cancel anytime

Upgrade to Pro
  • Fear and Greed Index, daily readings
  • Market data: prices, profiles, search
  • Earnings calendar and upcoming events
  • Full historical lookback, no window
  • 50,000 requests per day
  • Screeners, stock maps and chart metrics
  • 13F institutional and ETF holdings
  • SPY gamma exposure and implied move
  • Supply chain and catalyst research
  • CSV bulk exports
  • MCP server support
  • Email support

Terms of use. The Sentiment Index API is for personal and single-product use. Redistribution or resale of the raw data is not permitted.

API questions

Is there a free tier?

Yes. The free plan needs no card and does not expire. It covers the Fear and Greed Index, core market data and the earnings calendar, with a 90 day historical lookback and 1,000 requests per day.

What does the $20/month Pro plan add?

Pro removes the historical lookback window, raises the limit to 50,000 requests per day, and unlocks the screener, stock map, chart metrics, 13F and ETF holdings, gamma exposure, implied move, supply chain and catalyst endpoints, plus CSV bulk exports and MCP server support.

How do I authenticate?

Every request carries your key as a bearer token in the Authorization header. Keys are issued per account and can be rotated at any time.

Where does the data come from?

The same pipelines that power the site itself: the Fear and Greed Index and its indicators, SEC 13F filings, options chains for gamma and implied move, and market data for prices and fundamentals.

Can I redistribute the data?

No. The API is licensed for personal and single-product use. Reselling or republishing the raw data is not permitted.

What is the cancellation policy?

Cancel at any time. Pro access continues to the end of the billing period, then the key drops back to free tier limits rather than being disabled.