Polymarket Kalshi Arbitrage

Scans for arbitrage between Polymarket and Kalshi prediction markets.

Overview

Scans for arbitrage between Polymarket and Kalshi prediction markets. Pulls active markets from both venues, fuzzy-matches by title (Jaccard token overlap), and reports pairs whose implied YES probabilities diverge beyond a configurable threshold. Output is data-only: spread metrics, no trade execution. Useful for cross-market sentiment timing and signal triangulation. Use it as a cross-venue spread scanner, event price arbitrage detector, or Polymarket vs Kalshi comparison.

Endpoint

Method	Endpoint	Price	Description
POST	/v1/marketplace/api/polymarket-kalshi-arbitrage	$0.023	Invoke Polymarket Kalshi Arbitrage (Blockchain) and return the upstream response.

How to call it

Requests are paid per call over the x402 protocol. Call the endpoint, receive a 402 Payment Required quote, then repeat the request with the signed payment header. The SDKs do both steps for you.

# 1. Ask for a quote
curl -i -X POST https://api.jarvisclaw.ai/v1/marketplace/api/polymarket-kalshi-arbitrage \
  -H 'Content-Type: application/json' \
  -d '{}'

# 2. Pay it (the SDK signs and retries for you)
curl -X POST https://api.jarvisclaw.ai/v1/marketplace/api/polymarket-kalshi-arbitrage \
  -H 'Content-Type: application/json' \
  -H 'X-PAYMENT: <signed-payload>' \
  -d '{}'

Open in the marketplace