REST API Platform

Build with the EventGraph API

A single, powerful REST API to query normalized prediction market data, cross-venue analytics, and arbitrage opportunities.

Normalized Data Layer

Every prediction market venue uses different data schemas, market resolutions, and order book structures. EventGraph handles the messy integrations, offering you a clean, unified JSON schema.

Venue-Agnostic SetupQuery Polymarket, Kalshi, and Limitless with exactly the same parameters.
Structured JSONClean order books, trades, and liquidity metrics ready for ingestion.
Intelligence IncludedDirectly fetch consensus probability or arbitrage spreads, no local calculations needed.

json

// GET /v1/events/president-2028/cross-venue
{
  "id": "president-2028",
  "title": "Who will win the 2028 US Presidential Election?",
  "consensus_probability": {
    "democrat": 0.48,
    "republican": 0.52
  },
  "venues": {
    "polymarket": {
      "democrat": 0.49,
      "republican": 0.51,
      "liquidity": 12050000
    },
    "kalshi": {
      "democrat": 0.46,
      "republican": 0.54,
      "liquidity": 8500000
    }
  },
  "arbitrage_available": true,
  "max_spread": 0.03
}

Core Endpoints

The most powerful prediction market REST API ever built. Base URL: https://api.eventgraph.ai

GET/v1/events

List all active prediction events across all venues

GET/v1/markets

Get specific market order books and pricing

GET/v1/cross-venue

Get normalized price comparisons for specific events

GET/v1/arbitrage

Scan and fetch real-time arb opportunities

GET/v1/probabilities

Get consensus probability scores for outcomes