# Developer Tools
source: https://developer.mastercard.com/enhanced-currency-conversion-calculator/documentation/developer-tools/index.md

These tools let you explore and test the Enhanced Currency Conversion Calculator API without writing an integration from scratch.

* [Reference Application](https://developer.mastercard.com/enhanced-currency-conversion-calculator/documentation/developer-tools/reference-app/index.md) --- a downloadable Spring application that calls every endpoint using a signed OAuth 1.0a client.
* [Postman Collection](https://developer.mastercard.com/enhanced-currency-conversion-calculator/documentation/developer-tools/postman-collection/index.md) --- a hosted Postman collection you can fork and run with saved Sandbox/Production credentials.
* [Insomnia Collection](https://developer.mastercard.com/enhanced-currency-conversion-calculator/documentation/developer-tools/insomnia-collection/index.md) --- steps to build a signed request collection in Insomnia from the OpenAPI specification.