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Get your free API key at dashboard.predexon.com to start trading programmatically.

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Overview

Predexon Trading API provides an interface for trading on prediction markets. Users don’t manage their own wallets - the API handles wallet creation, key management, and transaction signing on their behalf.

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Base URLs

SurfaceBase URLPurpose
Trading APIhttps://trade.predexon.comPlace orders, manage users, funds, fees
Data APIhttps://api.predexon.comMarket data, prices, trading history (see Data API docs)

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Supported Venues

Polymarket

Polygon blockchain. Collateral: USDC.e. Supports limit and market orders.

Predict.fun

BNB Smart Chain. Collateral: USDT (BEP-20). Supports limit and market orders.

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Authentication

All requests require an API key passed via the x-api-key header: 
curl -X POST \
  -H "x-api-key: YOUR_API_KEY" \
  https://trade.predexon.com/api/users/create
Each API key can create multiple users. Users are “owned” by the API key that created them - you can only access your own users.

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Error Handling

All errors return a JSON body with an error field: 
{
  "error": "Insufficient balance"
}
Status CodeDescriptionAction
400Bad request - invalid parameters or insufficient fundsFix the request and retry
401Unauthorized - missing or invalid API keyCheck your x-api-key header
403Forbidden - user not owned by this API keyVerify the user belongs to your key
404Not found - user or resource doesn’t existCheck the ID
409Conflict - concurrent modification (fee policy)Retry the request
500Internal server errorRetry with exponential backoff
Retry 5xx errors with exponential backoff. Do not retry 4xx errors - they indicate a problem with the request.

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Next Steps

Quickstart

Place your first trade in 5 minutes

How It Works

Understand wallet management and order execution

Funding & Withdrawals

Deposit and withdraw funds

Placing Trades

Order types, venues, and the full trading workflow