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Base URL

https://api.predexon.com
All endpoints return JSON and authenticate via the x-api-key header. Get your free API key →

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Endpoint Categories

Polymarket

Markets, prices, candlesticks, orderbooks, trades, wallet analytics, and smart money.

Cross-Platform Matching

Find equivalent markets across Polymarket and Kalshi.

Kalshi · Dflow · Binance

Markets, trades, orderbooks, and tick data across platforms.

All Endpoints

Complete directory of all 38 Data API + 11 Trading API endpoints.

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Pagination

Most list endpoints support one of two methods:
ParameterTypeDefaultDescription
limitinteger20–100Number of items to return
offsetinteger0Items to skip
{
  "pagination": {
    "limit": 20, "offset": 0, "total": 1234, "has_more": true
  }
}

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Time Parameters

Time-based endpoints accept Unix timestamps in seconds:
ParameterTypeDescription
start_timeintegerStart of time range
end_timeintegerEnd of time range
Some endpoints (like orderbooks) use milliseconds. Check individual endpoint docs.

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Response Format

{
  "markets": [...],
  "pagination": {...}
}

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Health Check

curl https://api.predexon.com/health
# {"status": "healthy"}

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Rate Limits & Free Endpoints

Most endpoints are free. Core market data, trades, orderbooks, and pricing endpoints are free and unlimited on all plans.
TierRate LimitMonthly RequestsOveragePrice
Free1 req/sec1,000—$0/month
Dev20 req/sec1,000,000$5 / 100K$49/month
Pro100 req/sec5,000,000$2.50 / 100K$249/month
EnterpriseCustomUnlimited—$499+/month

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Free Endpoints (All Plans)

  • /v2/polymarket/markets — List markets
  • /v2/polymarket/events — List events
  • /v2/polymarket/crypto-updown — Crypto up/down markets
  • /v2/polymarket/market-price/{token_id} — Market price
  • /v2/polymarket/candlesticks/{condition_id} — Candlesticks
  • /v2/polymarket/volume-chart/{condition_id} — Volume chart
  • /v2/polymarket/orderbooks — Orderbook history
  • /v2/polymarket/trades — Trades history
  • /v2/polymarket/activity — Wallet activity
  • /v2/polymarket/markets/{token_id}/volume — Volume time series
  • /v2/polymarket/markets/{condition_id}/open_interest — Open interest
  • /v2/polymarket/positions — All positions
  • /v2/kalshi/markets — List markets
  • /v2/kalshi/trades — Trades history
  • /v2/kalshi/orderbooks — Orderbook history
  • /v2/dflow/trades — Trades history

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Gated Endpoints (Dev+)

  • Cross-Platform Matching — /v2/matching-markets/*
  • Smart Money & Analytics — Leaderboards, cohort stats, wallet profiles, smart activity
  • Binance Data — /v2/binance/*
See predexon.com/pricing for full plan comparison.

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Global Constraints

ConstraintValue
Max search length100 characters (minimum 3)
Max array filter items50 items
Offset has no upper limit. Individual endpoint limits vary — see each endpoint for specific limit ranges.

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OpenAPI Specification

OpenAPI Specification

Download the OpenAPI 3.0 JSON specification for generating client SDKs.