When will the PredictionMarkets.us API launch?

The API is currently in development with no confirmed launch date. Join the waitlist to be notified when it becomes available.

What data will the API provide?

The API will offer normalized cross-platform prediction market data from Kalshi, Polymarket, and other exchanges, including real-time prices, arbitrage signals, and regulatory status.

Pricing has not been announced. Join the waitlist for early access and pricing details.

Which platforms is the API expected to cover?

The API is expected to aggregate data from major prediction market platforms into a single normalized schema. Final platform coverage has not been announced.

Guide

April 20268 min read

Cross-platform prediction market data. One API.

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

COMING SOONPredictionMarkets.us API

Cross-platform prediction market data. One API.

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.

What We’re Building

Platform-Neutral

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.

Editorial Quality

Curated, not scraped. Cross-platform market matching with confidence scores. We flag mismatches so your data is clean.

Real-Time Signals

Arbitrage opportunities, volume spikes, and whale activity. Not brokerage, custody, or order routing — market intelligence. See it in action on our live activity dashboard.

Developer trust layer

API + agent-tool trust checklist

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 checklist

Before you trust a data/API/tool layer

Source URL and source type are visible.

Read-only vs write/trade-capable permissions are separated.

Auth, custody, and private-key boundaries are explicit.

Quote timestamp and venue label travel with displayed data.

The page states that PredictionMarkets.US is not a broker, exchange, order router, or custody provider.

A wrapper can normalize data without controlling settlement, custody, or rule text. PredictionMarkets.US is not a broker, exchange, order router, or custody provider.

Next checks

API and analysis tools map Platform architecture map Bot execution reality checklist

Planned Endpoints

PREVIEW

GET/api/v1/markets

List markets with cross-platform prices

GET/api/v1/markets/:slug

Single market — all platforms, spread, confidence

GET/api/v1/arb

Live arbitrage opportunities

GET/api/v1/movers

24h volume movers, cross-platform

GET/api/v1/regulatory-status

State-by-state legality matrix (all platforms)

GET/api/v1/markets/:slug/history

30-day price history

Endpoints and parameters are subject to change before launch. This is a preview of the planned API structure.

Who It’s For

Journalists & Researchers

Citation-ready data with source attribution. Cross-platform prices in one call. Visit our media resources for attribution guidelines and press access.

Developers & Data Scientists

Normalized schema across platforms. Historical price data. Build dashboards, alerts, and analysis tools.

Traders & Analysts

Real-time arbitrage detection. Volume spike alerts. Cross-platform spread analysis. Compare trading costs with our fee comparison guide.

Content Creators

Embed live prediction market data in your content. Automated market summaries and trend reports.

Data Sources

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•Polymarket Gamma API + CLOB•ForecastEx (via IBKR API)•Crypto.com CDNA API•PredictIt API•CFTC Public Data

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.

Cross-platform prediction market data. One API.

Cross-platform prediction market data. One API.

What We’re Building

Platform-Neutral

Editorial Quality

Real-Time Signals

API + agent-tool trust checklist

Before you trust a data/API/tool layer

Next checks

Planned Endpoints

Who It’s For

Journalists & Researchers

Developers & Data Scientists

Traders & Analysts

Content Creators

Data Sources

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