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API · /kalshi-api

Kalshi Event Markets API

healthy 3,640 Subscribers

Live market data from Kalshi, the CFTC-regulated US event-contract exchange, served from its public trade API. Kalshi lists yes/no contracts that settle on real-world outcomes — elections, economics, Federal Reserve decisions, weather, sports and world events — and the executed price is the market-implied probability of that outcome. The trades endpoint returns the recent public trade tape: the executed price (as cents and as a 0-1 probability), the size, the taker side and the time — the live pulse of what is actually trading. The events endpoint lists the events (the questions) that group markets, with their category and series. The markets endpoint is the contract directory — every tradable market with its ticker, the yes outcome it settles on, its status and open/close times — filterable by event, series or status. This is a regulated real-money event-contract venue — live implied probabilities and order flow — distinct from the play-money (Manifold), political (PredictIt) and crypto (Polymarket) prediction-market APIs in the catalogue. Live order-book snapshots are gated behind authentication upstream, so prices are sourced from the public trade tape. Live, no key on the upstream, nothing stored.

#kalshi #prediction-markets #event-contracts #trading #probabilities #forecasting #cftc #markets
api.oanor.com/kalshi-api
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Machine-readable spec so AI agents can integrate this API.

/api/kalshi-api/openapi.json
/api/kalshi-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
221 ms
Server probes · 24h
Subscribers
3,640
active
Total calls
0
last 7 days
status Full status page → · 4 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 21,000 calls / month
  • 5 requests / second
  • Hard cap (429 above quota, no overage)
  • 21,000 calls/month
  • 5 req/sec
  • Trade tape, events & directory
  • No credit card
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Starter

€8.15 /month

  • 245,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 245k calls/month
  • 15 req/sec
  • Full event coverage
  • Email support
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Pro

€24.40 /month

  • 1,050,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.05M calls/month
  • 40 req/sec
  • Forecasting & signal pipelines
  • Priority support
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Scale

€55.60 /month

  • 3,700,000 calls / month
  • 100 requests / second
  • Hard cap (429 above quota, no overage)
  • 3.7M calls/month
  • 100 req/sec
  • Desk / research scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Crypto Slippage & Market Impact API

What a crypto trade actually costs once it eats into the order book — computed live from Binance's full depth feed (up to 5000 levels per side), no key, nothing stored. Top-of-book price is a fiction for anything but the smallest order: a real market order walks down the book, filling progressively worse levels, and the gap between the quoted price and the realised average fill is slippage. The estimate endpoint takes a pair, a side (buy or sell) and a size — in quote currency (notional, e.g. $250,000) or in base coin (quantity) — walks the live book level by level and returns the average fill price, the slippage versus the mid and versus top-of-book, the price impact (how far the last filled level sits from mid), the number of levels consumed and whether the book even holds enough liquidity to fill. The depth endpoint returns a liquidity profile: top bid/ask, mid, spread and the cumulative bid- and ask-side liquidity sitting within ±0.1%, ±0.25%, ±0.5%, ±1% and ±2% of mid, plus the book imbalance — a one-glance read on how deep and how lopsided a market is. The symbols endpoint lists tradable pairs. This is the execution-cost / market-impact analytics cut for crypto — distinct from the raw exchange order-book feed, from VWAP-on-candles, and from the price, ticker and quote APIs in the catalogue. Pairs are Binance symbols (BTCUSDT) or a coin=BTC&quote=USDT form.

api.oanor.com/slippage-api

Trending Stocks API

The tickers people are actually searching for right now, served from Yahoo Finance's public trending feed. This is an attention and retail-interest signal, not a price-mover list: the trending endpoint returns the most-searched symbols in a region (US, UK, Germany, France, India, Brazil and more), and enriches each one with its live price, day change and exchange — so you see what is grabbing attention and how it is moving. The ticker endpoint answers the question "is this symbol trending right now, and where does it rank". The regions endpoint lists the supported markets. This is the search-attention / sentiment data-cut for stocks — what retail is watching — distinct from the price-based market-movers, the live-quote and the intraday-candle APIs in the catalogue. Trending reflects search interest and shifts through the trading day. Live, no key on the upstream, nothing stored.

api.oanor.com/trendingstocks-api

Put/Call Ratio & Options Sentiment API

Live (15-minute delayed) options put/call sentiment analytics for US stocks and indices, computed from CBOE's public delayed-quotes feed. The ratio endpoint aggregates the entire option chain into the headline sentiment gauges — the put/call ratio by volume and by open interest, the total put and call volume and open interest, the contract counts, and the underlying price with its 30-day implied volatility (IV30) — plus a plain-language sentiment lean. The expiries endpoint breaks the put/call ratio down by expiration date, giving the term structure of sentiment. The strikes endpoint maps call-versus-put volume and open interest across strikes for an expiration, showing where positioning sits. This is the computed options-sentiment and positioning view — ratios and skew, not a contract dump — distinct from the raw options-chain, the volatility-index and the options-pricing calculators in the catalogue. US index options use an underscore-prefixed symbol (_SPX, _VIX); a ratio above 1 means more puts than calls (defensive/bearish lean). Live, no key on the upstream, nothing stored.

api.oanor.com/putcallratio-api

Intraday Stock Candles API

Live intraday and historical OHLCV candles for stocks, indices, ETFs, crypto and FX, served from Yahoo Finance's public chart feed. The candles endpoint returns regular-session bars — open, high, low, close and volume — at a chosen interval (1m, 2m, 5m, 15m, 30m, 60m, 90m, 1h, 1d, 1wk, 1mo) over a range, each bar timestamped. The extended endpoint returns the pre-market and after-hours (extended-hours) bars, each labelled with its session. The latest endpoint returns an intraday snapshot — current price, day change and percent, the day open/high/low and volume, the 52-week range and the most recent bar. Symbols follow Yahoo conventions: US tickers (AAPL, MSFT), indices (^GSPC, ^IXIC), crypto (BTC-USD) and FX (EURUSD=X). This is the intraday candlestick / OHLCV view — per-minute to hourly bars plus extended hours — distinct from the daily price-history, the live-quote and the FX/rate APIs in the catalogue. Live, no key on the upstream, nothing stored.

api.oanor.com/intraday-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Kalshi Event Markets API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Kalshi Event Markets API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Kalshi Event Markets API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Kalshi Event Markets API cost?
Kalshi Event Markets API has a free tier with 100 calls / month. Paid plans start at €8.15 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Kalshi Event Markets API GDPR-compliant?
All requests to Kalshi Event Markets API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/kalshi-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/kalshi-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/kalshi-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/kalshi-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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