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

Full status page → · 4 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

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

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

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

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

Built by

PremiumApi

Related APIs

Other APIs with overlapping tags.

Crypto Order Flow & CVD API

Who is actually hitting the market — buyers or sellers — read live from Binance's aggregated trade tape, no key, nothing stored. Every trade carries a flag for which side was the aggressor: a taker buy lifts the ask, a taker sell hits the bid. Summing those over a window gives order flow — the net buying or selling pressure that price action follows — and its running total is the Cumulative Volume Delta (CVD), the metric order-flow traders watch to spot absorption and divergence. The flow endpoint scans the recent aggregated trades for a pair (up to 5,000) and returns the taker-buy and taker-sell volume in base and quote, the delta (buy minus sell), the CVD over the window, the buy/sell ratio, the share of volume that was buying, a net-pressure label and the time span covered. The large endpoint surfaces the big prints — single aggressive trades above a notional threshold — and tags each as a taker buy or sell, so you see the whale orders moving the tape, with the buy- and sell-side large-trade totals. The symbols endpoint lists tradable pairs. This is the trade-flow / CVD microstructure analytics cut for crypto — distinct from the raw recent-trades feed, the order-book depth and the price, ticker and slippage APIs in the catalogue. Pairs are Binance symbols (BTCUSDT) or a coin=BTC&quote=USDT form.

api.oanor.com/orderflow-api

Crypto Options Max Pain & Open Interest API

Where the crypto options market is positioned, and the strike toward which an expiry's open interest exerts the most "pain" — computed live from Deribit's public option book, no key, nothing stored. Max pain is the strike at which the total value of all open options is lowest at expiry: the price at which the greatest dollar amount of option open interest expires worthless and option writers keep the most premium. Traders watch it because price often gravitates toward max pain into a large expiry. The maxpain endpoint takes a currency (BTC, ETH, SOL, XRP) and an expiry and returns the max-pain strike, the spot/underlying, how far spot sits from max pain, and the call and put open-interest totals with the put/call OI ratio. The oi endpoint returns the full open-interest-by-strike distribution for an expiry — which strikes hold the most open interest, the magnets and walls (support & resistance) traders watch. The expiries endpoint lists every listed expiry with its aggregate open interest, contract count and call/put split. This is the aggregate options-positioning / max-pain analytics cut for crypto — distinct from the raw per-contract option chain (greeks/IV), from US equity options and from the crypto-volatility APIs in the catalogue. Currency is BTC, ETH, SOL or XRP; expiry is a Deribit code like 26JUN26.

api.oanor.com/maxpain-api

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

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.

Markets 3

Meta 1

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

GET /v1/events

Events (questions) grouping markets

Playground

Parameters

Custom headers

Language: Client:

GET /v1/markets

Contract directory

Playground

Parameters

Custom headers

Language: Client:

GET /v1/trades

Recent public trade tape with prices

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Spec

Playground

Custom headers

Language: Client:

Code snippets

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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Kalshi Event Markets API

API health

Pricing

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Related APIs

Crypto Order Flow & CVD API

Crypto Options Max Pain & Open Interest API

Crypto Slippage & Market Impact API

Trending Stocks API

Frequently asked questions

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