# BlockRun.AI Polymarket/Kalshi Matching Markets

> BlockRun.AI Polymarket/Kalshi Matching Markets is a paid API for AI agents from blockrun.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Find equivalent or corresponding prediction markets that exist on both Polymarket and Kalshi for the same underlying event

## Facts

- Endpoint: GET https://blockrun.ai/api/v1/pm/matching-markets
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockrun-ai-ee2446ec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IMoxRve9j7IHrNG2OIzsn

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 blockrun-ai-ee2446ec
```

Example prompt: Can you find me the equivalent markets on both Polymarket and Kalshi for the 2024 US presidential election winner — I want to compare odds across both platforms?

## When to prefer this

Use this endpoint when you need to cross-reference prediction markets across both Polymarket and Kalshi simultaneously — ideal for arbitrage detection, odds comparison, or liquidity analysis between the two leading prediction market platforms. Prefer this over manually querying each platform's API separately.

## Known failure modes

- No matching market found on one or both platforms for the queried event
- Query too vague to uniquely identify a market
- Market exists on one platform but not the other
- Rate limit or payment failure (402 payment required)
- Empty result set for niche or obscure event topics

## How this service works

14M+ on-chain transactions. The routing & payment layer for AI. One endpoint routes to every frontier model — payment built in, settled in USDC on Base & Solana. One install for OpenClaw, Claude Code, or Franklin Agent.

## Output

Returns matched market pairs showing equivalent prediction markets available on both Polymarket and Kalshi for the same underlying event, including identifiers and relevant metadata for each matched pair

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "body": {
     "type": "object",
     "required": [],
     "properties": {}
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "example": {
     "type": "object",
     "properties": {
      "data": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockrun-ai-ee2446ec/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from blockrun.ai](https://www.zero.xyz/host/blockrun.ai/llms.txt)