# Polymarket vs Kalshi Cross-Platform Prediction Market Gap Finder

> Polymarket vs Kalshi Cross-Platform Prediction Market Gap Finder is a paid API for AI agents from clinkagent.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-02).

Returns the biggest probability disagreements between Polymarket and Kalshi on the same prediction market question, including prices, gap sizes, volumes, close dates, and match confidence.

## Facts

- Endpoint: GET https://clinkagent.com/pm/gaps?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarket-vs-kalshi-cross-platform-prediction-market-gap-finder-21f12f11
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KFl18JkUHjlEbP92Xb73R

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 polymarket-vs-kalshi-cross-platform-prediction-market-gap-finder-21f12f11
```

Example prompt: Show me the top 10 biggest probability gaps between Polymarket and Kalshi right now — only gaps larger than 5 points — and filter by anything related to the US election.

## When to prefer this

Use this endpoint when you need to compare the same prediction market event across Polymarket and Kalshi simultaneously, especially for arbitrage research, cross-venue price validation, or identifying where the two platforms diverge most in their implied probabilities. Prefer this over querying each platform separately when you want pre-matched, gap-ranked results in a single call. Not suitable for real-time execution — prices are from a snapshot refreshed every 30 minutes.

## Known failure modes

- limit parameter out of range (must be 1-50) returns error or empty result
- min_gap set too high returns empty result set with no matches
- q keyword too niche yields no matched questions
- snapshot may be up to 30 minutes stale — real-time prices may differ
- two questions matched with low confidence may not actually resolve on the same terms

## How this service works

Prediction market cross-platform gaps - biggest disagreements between Polymarket and Kalshi on the SAME question: both questions and probabilities, the gap in points, volumes, close dates, urls, match_confidence. Arbitrage research, sanity-checking a price against a second venue, event-risk divergence. From a background snapshot rebuilt every 30 min. ?limit=1-50&min_gap=<pts, default 0>&q=<optional topic>. Check both resolve on the same terms.

## Output

A ranked list of matched prediction market questions appearing on both Polymarket and Kalshi, ordered by probability gap. Each entry includes: the question text from both platforms, their respective probabilities, the gap in percentage points, trading volumes, market close dates, direct URLs to each market, and a match confidence score indicating how reliably the two questions refer to the same event.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "q": {
       "type": "string"
      },
      "limit": {
       "type": "string"
      },
      "min_gap": {
       "type": "string"
      }
     }
    }
   },
   "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/polymarket-vs-kalshi-cross-platform-prediction-market-gap-finder-21f12f11/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clinkagent.com](https://www.zero.xyz/host/clinkagent.com/llms.txt)