Overview

Kalshi is a CFTC-regulated prediction exchange where traders buy and sell event contracts with binary yes/no outcomes. Unlike Polymarket (which operates on-chain), Kalshi is a centralized, regulated US exchange. Contracts are priced in cents from 0 to 100, where the price represents both the cost of a YES contract and the market's implied probability.

Kwery ingests Kalshi's order book, trade, and pricing data and exposes it through a normalized time-series interface.

What we ingest

• YES/NO bid-ask prices in cents (0–100)
• Order book snapshots with depth on both sides
• Volume and open interest per contract
• Taker flow metrics including buy ratio and order imbalance

Currently tracked assets: BTC, ETH, SOL.

Data semantics

Available endpoints

List Kalshi markets

GET /v1/kalshi

Returns all tracked Kalshi event contracts and their metadata.

curl "https://kwery-api.com/v1/kalshi?api-key=YOUR_KEY&symbol=BTC&limit=5"

{
  "contracts": [
    {
      "symbol": "BTC",
      "ticker": "KXBTC-26MAR31-80000",
      "title": "Will BTC be above $80,000 on March 31?",
      "status": "active",
      "expiration": "2026-03-31T23:59:59Z",
      "strike": 80000
    }
  ],
  "total": 18,
  "limit": 5,
  "offset": 0
}

Get contract data

GET /v1/kalshi/{symbol}

Returns time-series data for a specific Kalshi contract.

curl "https://kwery-api.com/v1/kalshi/KXBTC-26MAR31-80000?api-key=YOUR_KEY&interval=1h&limit=2"

{
  "symbol": "KXBTC-26MAR31-80000",
  "source": "kalshi",
  "interval": "1h",
  "data": [
    {
      "timestamp": "2026-03-09T12:00:00Z",
      "yes_bid": 71,
      "yes_ask": 73,
      "no_bid": 27,
      "no_ask": 29,
      "mid_price": 72.0,
      "spread": 2,
      "volume": 4520,
      "open_interest": 18340,
      "taker_buy_ratio": 0.58,
      "imbalance": 0.12,
      "depth_metrics": {
        "yes_bid_depth_5": 12400,
        "yes_ask_depth_5": 10800,
        "no_bid_depth_5": 10800,
        "no_ask_depth_5": 12400
      },
      "order_book": {
        "yes_bids": [[71, 3200], [70, 5400], [69, 7800]],
        "no_bids": [[27, 2800], [26, 4600], [25, 6900]],
        "yes_asks": [[73, 2900], [74, 5100], [75, 7200]],
        "no_asks": [[29, 3200], [30, 5400], [31, 7800]]
      }
    },
    {
      "timestamp": "2026-03-09T11:00:00Z",
      "yes_bid": 70,
      "yes_ask": 72,
      "no_bid": 28,
      "no_ask": 30,
      "mid_price": 71.0,
      "spread": 2,
      "volume": 3810,
      "open_interest": 17920,
      "taker_buy_ratio": 0.53,
      "imbalance": 0.06,
      "depth_metrics": {
        "yes_bid_depth_5": 11800,
        "yes_ask_depth_5": 10200,
        "no_bid_depth_5": 10200,
        "no_ask_depth_5": 11800
      },
      "order_book": {
        "yes_bids": [[70, 3100], [69, 5200], [68, 7500]],
        "no_bids": [[28, 2700], [27, 4400], [26, 6700]],
        "yes_asks": [[72, 2800], [73, 5000], [74, 7100]],
        "no_asks": [[30, 3100], [31, 5200], [32, 7500]]
      }
    }
  ],
  "total": 720,
  "limit": 2,
  "offset": 0
}

Source-specific fields

Available intervals

Limitations & notes

• Prices are in cents, not dollars. A yes_bid of 72 means 72¢ ($0.72), not $72. This is the native Kalshi denomination.
• YES and NO are complementary. A YES bid at P¢ is economically equivalent to a NO ask at (100 − P)¢. Both sides of the book are provided for convenience.
• Order book requires Pro plan. The order_book field containing the full depth arrays is only returned on Pro, Business, and Enterprise plans. depth_metrics aggregates are available on all plans.
• Multiple contracts per asset. Like Polymarket, a single asset can have many active contracts at different strikes and expirations. Use GET /v1/kalshi to discover them.
• Regulated exchange hours. Kalshi operates under CFTC oversight. While markets are generally available 24/7, certain contracts may have restricted trading windows or halt during settlement.
• taker_buy_ratio and imbalance are interval-level metrics. They summarize order flow within the given interval, not cumulative values.