> For the complete documentation index, see [llms.txt](https://paymasterdocs.gitbook.io/paymasterdocs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://paymasterdocs.gitbook.io/paymasterdocs/all-in-one-paymaster.md).

# All-In-One Paymaster

The main page of the paymaster Docs.

> The All-In-One Paymaster is a fully open source, initially made by team SITCHUCORGY in UpsideAcademy from ChainLight and UPbit. Any further contribution for the Docs is welcomed!

This document describes about the Paymaster service and it's contract, which is one of the core entities of the ERC-4337. 

<table data-view="cards"><thead><tr><th></th><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><h3>Basics of Paymaster</h3></td><td>If you are new to paymaster, read this</td><td></td><td><a href="/paymasterdocs/basics-of-paymaster/what-is-paymaster.md">What is Paymaster?</a></td></tr><tr><td><h3>Several Types of the Paymaster</h3></td><td>If you want to specify the types of the paymaster, read this</td><td></td><td><a href="/paymasterdocs/vectors-of-paymaster/threat-modeling.md">Vectors of Paymaster</a></td></tr><tr><td><h3>Vectors of Paymaster</h3></td><td>If you want to know the vulnerabilities of the paymaster, read this</td><td></td><td><a href="/paymasterdocs/vectors-of-paymaster/threat-modeling.md">Vectors of Paymaster</a></td></tr><tr><td><h3>Resources</h3></td><td>View resources to gain some information, deployed paymasters, and contributions</td><td></td><td><a href="/paymasterdocs/resources/resources.md">RESOURCES</a></td></tr></tbody></table>