Cross-platform prediction market API coming soon. Kalshi + Polymarket in one call. Normalized data, arbitrage signals, regulatory status. Join the waitlist.
Last updated: April 2026
We’re building a unified API for Kalshi, Polymarket, and more — normalized market slugs, real-time prices, arbitrage signals, and state-by-state regulatory data. All editorially curated, not scraped.
Kalshi + Polymarket are core targets. No platform owns us. The goal is normalized data across major exchanges in one schema. Browse our platform directory to see the ecosystem we track.
Curated, not scraped. Cross-platform market matching with confidence scores. We flag mismatches so your data is clean.
Arbitrage opportunities, volume spikes, and whale activity. Not brokerage, custody, or order routing — market intelligence. See it in action on our live activity dashboard.
One API is a claim. Verify which layer a tool controls before you build on it, cite it, or connect it to an automated workflow.
Callable by an agent does not mean safe to trade. Official docs are the source of record for endpoint behavior; third-party packages are implementation layers.
Does an MCP or SDK mean the tool can safely trade for me?
No. Callable tools and SDKs can make data or actions easier to reach, but they do not settle custody, authorization, market rules, execution quality, or risk management. Keep read-only data separate from write or trade-capable permissions, log actions, and require human review before any trade-capable workflow.
GitHub repo vetting before integration
Before installing a wrapper or MCP server, classify source identity, permissions, maintenance, and execution claims. A repo can simplify API calls without proving trade safety.
Open repo-vetting checklistA wrapper can normalize data without controlling settlement, custody, or rule text. PredictionMarkets.US is not a broker, exchange, order router, or custody provider.
/api/v1/marketsList markets with cross-platform prices
/api/v1/markets/:slugSingle market — all platforms, spread, confidence
/api/v1/arbLive arbitrage opportunities
/api/v1/movers24h volume movers, cross-platform
/api/v1/regulatory-statusState-by-state legality matrix (all platforms)
/api/v1/markets/:slug/history30-day price history
Endpoints and parameters are subject to change before launch. This is a preview of the planned API structure.
Citation-ready data with source attribution. Cross-platform prices in one call. Visit our media resources for attribution guidelines and press access.
Normalized schema across platforms. Historical price data. Build dashboards, alerts, and analysis tools.
Real-time arbitrage detection. Volume spike alerts. Cross-platform spread analysis. Compare trading costs with our fee comparison guide.
Embed live prediction market data in your content. Automated market summaries and trend reports.
Built on official platform APIs and source links where available — not just web scraping. We plan to aggregate, normalize, and editorially curate data from major prediction market platforms.
Kalshi Trade API v2
Official venue documentation for market data and exchange-specific workflows. Check the official docs for current endpoint behavior, permissions, and trading boundaries.
Polymarket Gamma API + CLOB
Official documentation covers market data and CLOB workflows. Treat docs as the source of record for endpoint behavior, auth, permissions, and rule-source links.
ForecastEx (via Interactive Brokers API)
Broker-facing access depends on the underlying brokerage relationship, permissions, and product availability. PredictionMarkets.us does not provide brokerage access.
Crypto.com CDNA
Documentation and availability should be checked at the rail/source layer before treating any wrapper app as equivalent to the underlying venue.
PredictionMarkets.us is an independent aggregator with no platform affiliations.
Compare every major prediction market platform side by side.
API / Geoblock Access ChecksSeparate public reads, authenticated CLOB calls, and geoblock diagnostics before building.
Platform Architecture MapUnderstand exchanges, wrappers, routers, and intelligence layers before choosing an integration path.
Live Market ActivityReal-time movers, volume trends, and whale activity across Kalshi, Polymarket, and PredictIt.
Fee Comparison GuideUnderstand trading costs across Kalshi, Polymarket, and more.
Market Insights & AnalysisDeep dives, trend analysis, and editorial commentary on prediction markets.
Journalism Tools & APIInteractive API explorer, embeddable widgets, and data tools for reporters.
Press & Media ResourcesAttribution guidelines, data access, and press contact information.
Getting Started GuideNew to prediction markets? Start here for a complete overview.