# Kalshi Markets Listing API

> Kalshi Markets Listing API is a paid API for AI agents from agent402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-16).

Lists CFTC-regulated Kalshi event contract markets with filtering by status or event ticker, returning bid/ask, last price, volume, and open interest

## Facts

- Endpoint: POST https://agent402.tools/api/kalshi-markets
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kalshi-markets-listing-api-b4dd4c5b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_K9Y8vM_vsFJEPSRC4X_rU

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-markets-listing-api-b4dd4c5b -d '<json body>'
```

Example prompt: Show me up to 50 currently open Kalshi prediction markets — I want to see the yes/no bid and ask prices, last traded price, volume, and open interest for each one.

## When to prefer this

Use this endpoint when you need CFTC-regulated US prediction market data from Kalshi, especially when compliance with US regulations matters or when Polymarket is unavailable. Prefer this over Polymarket endpoints when operating in a US-regulated context or when you need official exchange-style bid/ask data with open interest metrics.

## Known failure modes

- Invalid status value not in [open, closed, settled, unopened] returns validation error
- Unknown or misspelled eventTicker returns empty results or 404
- Limit out of range (below 1 or above 100) returns validation error
- Payment of 0.002 USDC not fulfilled causes 402 Payment Required
- Kalshi API upstream downtime causes 503 or timeout

## How this service works

List Kalshi markets (CFTC-regulated US event contracts). Filter by status (open/closed/settled/unopened) or by event ticker. Returns yes/no bid/ask, last price, volume, open interest. Complement to Polymarket for US-regulated markets and Kalshi-only categories (weather, economic data).

## Output

A list of up to 100 Kalshi event contract markets (default 20), each containing yes/no bid and ask prices, last traded price, volume, and open interest, optionally filtered by market status (open, closed, settled, or unopened) or by a specific event ticker.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "number",
   "description": "Max markets (1-100, default 20)."
  },
  "status": {
   "type": "string",
   "description": "Filter by status: open, closed, settled, unopened."
  },
  "eventTicker": {
   "type": "string",
   "description": "Filter to a specific event ticker."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 1,
  "cursor": "next-page-token",
  "source": "kalshi",
  "markets": [
   {
    "noAsk": 0.55,
    "noBid": 0.53,
    "title": "Will the Democratic nominee win?",
    "venue": "kalshi",
    "status": "open",
    "ticker": "PRES-24-DEM",
    "volume": 12345,
    "yesAsk": 0.47,
    "yesBid": 0.45,
    "openTime": "2026-01-01T00:00:00Z",
    "subtitle": "2026 US Presidential election",
    "venueUrl": "https://kalshi.com/markets/pres-24-dem",
    "closeTime": "2026-11-03T23:59:00Z",
    "lastPrice": 0.46,
    "eventTicker": "PRES-24",
    "openInterest": 5678
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kalshi-markets-listing-api-b4dd4c5b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402.tools](https://www.zero.xyz/host/agent402.tools/llms.txt)