> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chainstack.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Chainstack updates: April 18, 2023

> Revamped Chainstack Marketplace launches with Covalent and Valha apps, plus a new tutorial on JSON web token authentication for secure DApps.

* **Services**. A revamped [Chainstack Marketplace](https://console.chainstack.com/marketplace) is now live with the Covalent and Valha applications already available for installation—boost up your DApps!
* **Documentation**. The following article is added in Web3 \[De]Coded:
  * [Mastering JSON web tokens: How to implement secure user authentication](/docs/tutorial-mastering-jwt-how-to-implement-secure-user-authentication)