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The Buildmarkets Postman collection gives you ready-to-run requests organized into folders — one for each API domain. Import it, set three environment variables, and you’re making live sandbox calls in under two minutes.

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Quick setup

1

Import the collection

Open the Buildmarkets Postman Collection and click Run in Postman to import it directly into your Postman workspace.
2

Set environment variables

Create a new Postman environment and add these three variables:Select the environment from the dropdown in the top-right corner of Postman before sending any requests.
3

Run your first request

Open the Market Data → Real-time price request and click Send. It uses the preset symbol variable (AAPL), so it works before you have created any accounts.

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Collection contents

The collection is organized by API domain:

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Collection variables

The collection uses variables for resource IDs. After creating a resource, update the corresponding collection variable so subsequent requests in that flow reference it automatically: symbol, underlying, and contract come preset (AAPL, AAPL, and a sample option contract) so market-data requests run without setup.
Use Postman’s Tests tab to write a post-request script that automatically extracts the ID from each response and sets the corresponding collection variable. This lets you chain requests without manual copy-pasting.

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Switching environments

To switch from sandbox to production:
  1. Create a new Postman environment
  2. Set baseUrl to https://api.tappengine.com (no /v1 suffix)
  3. Enter your production API key and secret
  4. Select the production environment from the dropdown before sending requests
Production requests create real accounts and execute real trades. Confirm you have completed sandbox testing and received production access approval before switching environments.