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Synthesis provides a single API to trade on prediction markets across Polymarket and Kalshi. Create wallets, place orders, stream real-time data, and manage positions — all through one integration.

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Base URL

https://synthesis.trade

Getting started

Create an account, set up a wallet, and place your first order.

Authentication

Learn about project API keys, session tokens, and account API keys.

Real-time data

Stream live balances, orderbooks, and trades via WebSockets.

API reference

Browse all available endpoints across Projects, Markets, Wallets, and more.

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Response format

All API responses use a consistent envelope format. 
{
    "success": true,
    "response": {
        "data": "..."
    }
}

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Authentication overview

The API uses three authentication methods depending on the type of request.
Auth MethodHeaderUse CaseRoutes
Project API KeyX-PROJECT-API-KEYBackend account management/api/v1/project/*
Session TokenAuthorization: Bearer ...Frontend user authentication/api/v1/account/*, /api/v1/wallet/*
Account API KeyX-API-KEYBackend user operations/api/v1/account/*, /api/v1/wallet/*

Learn more about authentication

See detailed examples for each authentication method.