# Kalshi Market Categories List

> Kalshi Market Categories List is a paid API for AI agents from polymarketeer.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Lists all Kalshi prediction market categories along with counts of active events in each category

## Facts

- Endpoint: POST https://polymarketeer.vercel.app/api/x402/kalshi/categories
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarketeer-vercel-app-6d7ff6b3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_C1L1snls3n7WzvYk0L7Hw

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 polymarketeer-vercel-app-6d7ff6b3 -d '<json body>'
```

Example prompt: Show me all the categories available on Kalshi prediction markets along with how many active events are in each one.

## When to prefer this

Use this endpoint when you need to browse or enumerate all top-level Kalshi prediction market categories, especially when building a navigation UI, filtering markets by topic, or helping a user discover what kinds of events are tradeable on Kalshi. Prefer this over search endpoints when you don't have a specific keyword and just want a high-level overview of available market types.

## Known failure modes

- Kalshi API unavailable or rate-limited — returns 5xx or timeout
- No categories found — empty list returned if Kalshi data is temporarily unavailable
- Payment not processed — 402 response if USDC payment via x402 protocol fails

## How this service works

List all Kalshi market categories with active event counts

## Output

A list of all Kalshi market categories, each with its name, identifier, and the count of currently active events within that category.

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "data"
 ],
 "properties": {
  "data": {},
  "error": {
   "type": "string"
  }
 },
 "additionalProperties": false
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polymarketeer-vercel-app-6d7ff6b3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from polymarketeer.vercel.app](https://www.zero.xyz/host/polymarketeer.vercel.app/llms.txt)