# 6. Testing Free Tier APIs

If you are done with the previous steps, you can now start to test your APIs out. As we are running a sample Free Tier project in this Setup guide, there would be **no need to release and deploy** the APIs. All the APIs created in Draft mode (in development mode) can be tested on the free tier Development Environment **instantly and immediately 🚀.**

{% hint style="info" %}
Cosmocloud is an instant deployment platform, where as soon as you click Save Button (on Free mode) or release a new version (Pro mode) your APIs are already deployed and live. No need to wait for any deployment jobs or switchovers to happen.

Everything is **Instantly Deployed 🚀**

[Learn more on this here](/advanced-guide/performance-considerations/instant-deployments.md)
{% endhint %}

## Trying our your new APIs

1. Just open any API you would want to test and copy the **Development Endpoint** for that API.
   * You can also find the Base URL of your Development Environment in **Application Layer -> Environments**.
2. Open Postman and add your API there along with required fields like **request method**, request body, etc. needed for the API.
3. Add the required keys in **Headers** to call your APIs.
   1. **projectId** : The ID of your Cosmocloud Project. You can find this by clicking on your `Organisation's name` on the top left of your dashboard. You can find this ID in the list of Projects inside your Organisation.
   2. **environmentId** : You can find this by visiting **Environments** page in your Project's dashboard. Copy the **Development** environment's ID.
4. Hit the API !

{% hint style="info" %}
The above Headers are only required while calling the Development environment in Free projects. For dedicated environments in a Pro project, you mat not pass these headers.
{% endhint %}


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