# Aizamon Order Book — Prediction Market Prices

> Aizamon Order Book — Prediction Market Prices is a paid API for AI agents from aizamon.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-17).

Fetches top prediction market order book data from Kalshi and Polymarket, optionally filtered by topic, returning best bid/ask prices and 24-hour volume.

## Facts

- Endpoint: GET https://aizamon.com/x402/v1/book?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aizamon-order-book-prediction-market-prices-b62a2d31
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_L8iY7MwAmPGyaB6AkXpUf

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 aizamon-order-book-prediction-market-prices-b62a2d31
```

Example prompt: What are the current best bid and ask prices on Kalshi and Polymarket for markets about the US election? Show me the top markets by 24-hour volume.

## When to prefer this

Choose this endpoint when you need real-time prediction market order book data from both Kalshi and Polymarket in a single call, especially for comparing odds across platforms or finding the highest-volume markets on a given topic. Prefer it over scraping individual exchange UIs or using exchange-specific APIs when you want a unified cross-platform view with bid/ask and volume in one response.

## Known failure modes

- No markets returned for obscure or misspelled topic query — returns empty arrays
- Payment failure or 402 not resolved — endpoint not accessible
- Kalshi or Polymarket data source unavailable — partial or empty result
- Malformed query parameter — may return top markets as fallback or error
- Rate limiting if too many calls made in short succession

## How this service works

Aizamon is an operator-run Canadian shop: $5 emailed security summaries via Stripe, Tor tooling for Cursor, and redacted developer telemetry. Named support. Clear terms.

## Output

A JSON object with an 'ok' flag and a 'result.book' object containing separate arrays for Kalshi and Polymarket markets. Each market entry includes the question text, best bid price, best ask price, and 24-hour trading volume. Also includes a count of markets returned per platform and the x402 protocol identifier.

## 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"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "q": {
       "type": "string",
       "description": "Optional topic. Omit for the highest 24h-volume markets."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "sku": {
       "type": "string"
      },
      "result": {
       "type": "object"
      },
      "protocol": {
       "type": "string"
      }
     },
     "additionalProperties": true
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "sku": "SKU_AG_BOOK_01",
  "result": {
   "book": {
    "kalshi": {
     "count": 1,
     "markets": [
      {
       "yesAsk": 0.43,
       "yesBid": 0.4,
       "question": "example",
       "volume24hr": 500
      }
     ]
    },
    "polymarket": {
     "count": 1,
     "markets": [
      {
       "bestAsk": 0.42,
       "bestBid": 0.4,
       "question": "example",
       "volume24hr": 1000
      }
     ]
    }
   }
  },
  "protocol": "x402"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aizamon-order-book-prediction-market-prices-b62a2d31/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aizamon.com](https://www.zero.xyz/host/aizamon.com/llms.txt)