Sandbox

The PAX sandbox is a fully functional trading environment for developing and testing your integration. It runs the real matching engine with test funds so you can place orders, receive fills, and stream market data without risking real assets.

Quick start

Sign up at app-sandbox.pax.markets. Your account is instantly approved with no email verification or KYC. Create an API key in Settings. Sandbox keys start with pax_test_. Start trading against https://api-sandbox.pax.markets.

Base URLs

Service	URL
REST API	https://api-sandbox.pax.markets
WebSocket (market data)	wss://api-sandbox.pax.markets/v1/public/spot/market-data
WebSocket (user data)	wss://api-sandbox.pax.markets/v1/private/spot/user-data
Web app	https://app-sandbox.pax.markets

API key prefixes

Environment	Prefix	Example
Sandbox	pax_test_	pax_test_a1b2c3d4e5f6a1b2c3d4e5f6
Production	pax_live_	pax_live_a1b2c3d4e5f6a1b2c3d4e5f6

Sandbox keys (pax_test_) cannot authenticate against production. Generate a new keypair for production instead of reusing your sandbox one: signatures do not cover the host or the key ID, so with a shared keypair a sandbox request could be replayed against production.

Switching to production

Change the base URL from api-sandbox.pax.markets to api.pax.markets and use a pax_live_ API key made from a new keypair. The request format, authentication, and all endpoints are identical.