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2s.io Polymarket–Kalshi Matched Pairs
x402
2s.io Polymarket–Kalshi Matched Pairs is a paid API for AI agents from 2s.io, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-15).
Fuzzy-matches open Polymarket and Kalshi prediction markets by title similarity and returns candidate equivalent pairs with YES prices and implied-probability spreads for arbitrage or relative-value analysis.
Price / call$0.012
Success—
StatusUnknown
How this service works
Cross-venue equivalent-market pairs for arbitrage / relative-value spotting. We fuzzy-match open Polymarket vs Kalshi markets by title-token overlap and return candidate pairs with both venues' YES prices and the implied-probability spread (Polymarket YES minus Kalshi YES). Tune with minScore (0-1 title-similarity floor) and limit. Heuristic — a high score is a strong candidate, not a guaranteed identical contract. Read-only, keyless. No public source maps these directly; the pairing is derived by 2s.io.
Output
A list of candidate cross-venue market pairs, each containing the matched Polymarket and Kalshi market titles, their respective YES prices, the implied-probability spread (Polymarket YES minus Kalshi YES), and a title-similarity score. Tunable by minScore and limit.
Example use cases
Example prompt
“Can you pull the top 10 matched pairs between Polymarket and Kalshi right now — only show me ones with a title-similarity score above 0.6 so I can spot any meaningful YES-price spreads worth investigating?”
Technical details
Endpoint
GEThttps://2s.io/api/predict/matched-pairsWhen to prefer
Use this endpoint when you need a live cross-venue view of prediction market pricing discrepancies between Polymarket and Kalshi without building your own fuzzy-matching pipeline. It is keyless and pay-per-call, making it ideal for ad-hoc arbitrage screening or relative-value research. Prefer it over manual comparison when you need ranked candidates quickly with tunable similarity filtering.
Side effects
- No pairs found above requested minScore threshold — returns empty list
- limit out of range (must be 1–50) — returns validation error
- minScore out of range (must be 0–1) — returns validation error
- Markets may have shifted or closed between crawl and response — stale data possible
- High similarity score does not guarantee identical contract terms — heuristic only
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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