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STX Apps for developers

Anyone can build a prediction app.

Members sign in with STX, approve exactly what your app may do, and keep control. You build on the STX Prediction Platform, with live markets and SDKs in the languages you already use.

Start building Read the docs

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How it works

  1. Create your app

    Name it, add your redirect URLs and pick the permissions you need. You get demo credentials straight away.

  2. Connect members

    Members tap "Log in with STX" or "Link your STX account", see a plain-language consent screen and approve. Standard OAuth 2.0 with PKCE, no custom protocol to learn.

  3. Build and test in demo

    Trade, read portfolios and stream prices against the demo environment with test funds.

  4. Submit for review

    STX checks your listing and the permissions you ask for. Live access opens when STX Apps goes live in your region; until then everything runs in demo.

What your app can do

Members approve each one on the consent screen.

  • See their public profile: handle and avatar
  • Read their cash balance
  • Read positions and settlements
  • Read orders and fills
  • Read transfer history (read-only, never moves money)
  • Place and cancel orders on their behalf

Your app can also read the public market catalog, prices and order-book depth, and events and competitions.

Members stay in control.

They see every app they've connected and can disconnect any of them at any time. An app that places orders runs from server addresses you register.

Built for developers

Social trading apps, research tools, alerts, AI agents and analytics. If it helps people trade on what they know, it belongs here.

  • SDKs

    Python, TypeScript and .NET, plus REST and WebSockets.

  • Every kind of app

    Web and mobile apps that members connect, plus server-to-server credentials for market data.

  • Docs and examples

    Working code for signing, market data, orders and streaming.

Start with the TypeScript SDK.
npm install @stxapp/stx-typescript
Read the OAuth guide

See it working

Two demo apps you can open right now.

Each one shows a different way to bring STX members into an app.

Link an STX account

Sideline

An app with its own accounts. People sign in to Sideline, link their STX account once, and trade from there.

Open Sideline
Log in with STX

Playbook

No separate sign-up. People log in with their STX account and start right away.

Open Playbook

Both demos run in the demo environment with test funds.

Questions

What people ask first.

Does it cost anything to build?
No. Building and testing in the demo environment is free. STX shares the terms for live apps before your app goes live.
Do my users need an STX account?
Yes. They sign up or log in during connect, and you never handle their password.
Where is it available?
Apps are available in the US.
When does live access open?
Live access opens when STX Apps goes live in your region. Build and test in the demo environment now; your code carries over unchanged.

Anyone can build a prediction app.

Start building