# Kalshi Event Markets Data

> Kalshi Event Markets Data is a paid API for AI agents from x402-datashop-production.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Returns live Kalshi CFTC-regulated event market data including yes bid/ask prices, implied probabilities, 24h volume, and open interest, sorted by most-traded first

## Facts

- Endpoint: GET https://x402-datashop-production.up.railway.app/v1/predict/kalshi
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kalshi-event-markets-data-11c6fece
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qE56h0YvmUUGy98dqhM3h

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability kalshi-event-markets-data-11c6fece
```

Example prompt: Show me the top 10 most-traded Kalshi markets right now — I want to see the live yes bid/ask prices, implied probabilities, and 24h volume for the KXBTC series.

## When to prefer this

Use this endpoint when you need live, CFTC-regulated US event market prices from Kalshi — particularly for crypto (KXBTC), CPI (KXCPIYOY), or other macro series. Prefer this over Polymarket when you need regulated US exchange data or want to compare venue spreads via the cross-reference endpoint. Best for agents needing real-time implied probabilities and liquidity metrics from a compliant exchange.

## Known failure modes

- Invalid series_ticker returns empty results or 400 error
- limit out of range (below 1 or above 25) returns validation error
- Kalshi Trade API v2 upstream outage returns 502 or stale cached data
- Malformed query parameter type returns 400 bad request
- No markets found for given series returns empty array

## How this service works

Open markets on Kalshi, the CFTC-regulated US event exchange, most-traded first: ticker, title, live yes bid/ask (USD, 0-1), mid-quote implied probability, 24h volume, open interest and close time, from the public Trade API v2. Query: ?series=KXBTC (optional series_ticker filter, e.g. KXBTC, KXCPIYOY) &limit=1-25 (default 10). JSON, 5min cache. Cross-reference /v1/predict/polymarket for venue spreads.

## Output

A JSON array of up to 25 Kalshi event market objects (default 10), each containing: market ticker, title, live yes bid and ask prices in USD (0–1 scale), mid-quote implied probability, 24-hour trading volume, open interest, and contract close time. Results are sorted by most-traded first and cached for 5 minutes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "integer",
       "default": 10,
       "maximum": 25,
       "minimum": 1,
       "description": "Markets to return"
      },
      "series": {
       "type": "string",
       "description": "Kalshi series_ticker filter, e.g. KXBTC (optional)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kalshi-event-markets-data-11c6fece/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-datashop-production.up.railway.app](https://www.zero.xyz/host/x402-datashop-production.up.railway.app/llms.txt)