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Polymarket-Kalshi Arbitrage Opportunities Feed
x402
Polymarket-Kalshi Arbitrage Opportunities Feed is a paid API for AI agents from arb.axryl.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14).
Returns a JSON list of current arbitrage opportunities between Polymarket and Kalshi prediction markets, including profit percentages and pricing details for both legs.
Price / call$0.25
Success—
StatusUnknown
How this service works
JSON feed of arbitrage opportunities between Polymarket and Kalshi. Charged only when actionable opportunities are returned.
Output
A JSON object containing the minimum profit filter applied and an array of arbitrage opportunities, each with matched Polymarket and Kalshi market details (yes/no ask prices, liquidity, expiry dates, price source), total cost to enter both legs, profit percentage, which platform offers the cheaper no/yes side, and a match score indicating how confidently the two markets were paired.
Example use cases
Example prompt
“Show me up to 3 current arbitrage opportunities between Polymarket and Kalshi with at least a 1.5% profit margin.”
Technical details
Endpoint
POSThttps://arb.axryl.com/opportunities/jsonWhen to prefer
Use this endpoint when you need a ready-made, cross-platform arbitrage screener specifically for Polymarket and Kalshi prediction markets. Prefer this over building your own price comparison if you want fast, structured JSON output with profit calculations and market metadata already computed. Note that you are charged only when opportunities are actually returned, making it cost-efficient for polling workflows.
Side effects
- Empty opportunities array returned when no actionable arb exists at the requested min_profit threshold — still charges $0.25 USDC
- Markets move quickly; by the time a trade is placed, the opportunity may have closed
- Fuzzy-matched market pairs may not represent truly equivalent questions, leading to apparent arb that isn't real
- Price data may be from snapshot rather than live CLOB, introducing latency risk
- limit or min_profit values outside accepted ranges may cause errors or unexpected behavior
Tags
x402
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