> For the complete documentation index, see [llms.txt](https://docs.tonomy.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tonomy.io/build-web4-apps/usage.md).

# Usage

Use the following guides based on how you want to use the Tonomy SDK

* [Login](/build-web4-apps/usage/single-sign-on.md)
* [User Data and Logout](/build-web4-apps/usage/usage.md)
* [Sign Verifiable Credentials](/build-web4-apps/usage/sign-verifiable-credentials.md)
* [Server Authentication](/build-web4-apps/usage/server-authentication.md)
* [Smart Contracts](/build-web4-apps/usage/smart-contracts.md)
* [Send P2P Messages](/build-web4-apps/usage/send-p2p-messages.md)