Our Sandbox environment is designed to make it easy for you to test API calls in a safe, simulated version of Mercury — no real money involved.
Step 1: Sign up for a Sandbox account
First things first: you'll need a sandbox account.
Signing up skips the normal onboarding process. Your Sandbox account will come pre-loaded with dummy data including organizations, accounts, transactions, and account balances to allow testing.
Step 2: Create an API token (in the Sandbox)
Next, you’ll need an API token created specifically in the Sandbox environment. Go to the Sandbox dashboard after signing up.
Create a new API token from the UI.
Important: Tokens created outside of the Sandbox (like in production) won't work here.
Step 3: Direct your API requests correctly
When making API requests, make sure they’re pointed to our Sandbox base URL: https://api-sandbox.mercury.com/api/v1/
Any requests (like creating recipients, sending transactions, etc.) will show up in the Sandbox UI, so you can visually confirm what’s happening.
Quick Recap
- Use only Sandbox-created tokens
- Direct API calls to https://api-sandbox.mercury.com/api/v1/
- See your test data reflected in the Sandbox UI