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Plans

FreeDevProEnterprise
Price$0/month$49/month$249/month$499+/month
Rate Limit1 req/sec20 req/sec100 req/secCustom
Monthly Requests1,0001,000,0005,000,000Unlimited
Overage—$5 / 100K$2.50 / 100K—
WebSocketNo access10 subs × 10 items100 subs × 500 itemsCustom
Wildcards——2 per channelCustom
Priority RoutingNoNoNoYes (dedicated node)
Sign up and get your API key at dashboard.predexon.com.

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Free Endpoints

The following endpoints are free and unlimited on all plans and do not count toward your monthly request limit. Polymarket
  • GET /v2/polymarket/markets — List markets
  • GET /v2/polymarket/events — List events
  • GET /v2/polymarket/crypto-updown — Crypto up/down markets
  • GET /v2/polymarket/market-price/{token_id} — Market price
  • GET /v2/polymarket/candlesticks/{condition_id} — Candlesticks
  • GET /v2/polymarket/volume-chart/{condition_id} — Volume chart
  • GET /v2/polymarket/orderbooks — Orderbook history
  • GET /v2/polymarket/trades — Trades history
  • GET /v2/polymarket/activity — Wallet activity
  • GET /v2/polymarket/markets/{token_id}/volume — Volume time series
  • GET /v2/polymarket/markets/{condition_id}/open_interest — Open interest
  • GET /v2/polymarket/positions — All positions
Kalshi
  • GET /v2/kalshi/markets — List markets
  • GET /v2/kalshi/trades — Trades history
  • GET /v2/kalshi/orderbooks — Orderbook history
Dflow
  • GET /v2/dflow/trades — Trades history

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Gated Features

These features require a Dev plan or higher. Free tier users receive a 403 error.
FeatureEndpoints
Cross-Platform Matching/v2/matching-markets/*
Smart Money & AnalyticsLeaderboards, cohort stats, wallet profiles, smart activity
Binance Data/v2/binance/*
WebSocketwss://wss.predexon.com/v1/{API_KEY}

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WebSocket Limits

MetricDevProEnterprise
Subscriptions per connection10100Custom
Items per subscription10500Custom
Total items10050,000Custom
Wildcard subscriptionsNot allowed2 per channelCustom
Connection behavior:
  • Server sends a ping every 30 seconds; pong required within 60 seconds
  • Idle connections (zero subscriptions) are closed after 2 minutes
  • Buffer limits: events dropped at 1 MB, connection terminated at 4 MB

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Rate Limit Errors

Exceeding your rate limit returns HTTP 429 Too Many Requests. We recommend implementing exponential backoff in your application. You can check API health at any time: 
curl https://api.predexon.com/health
# {"status": "healthy"}