---
title: Paymaster - a composable components for AA of Ethereum
author: jhfnetboy
tags: paymaster, AA, aa, Paymaster
---

## Paymaster - a composable component for AA of Ethereum
+ AAStar will try to build a public paymaster service for the Ethereum mass adoption.

### Why Plancker choose this?
+ 1. Paymaster will not disappear like bundler, it will be a long term component for Acount Abstraction even the ERC4337 is changed.
+ 2. Ethereum need more different implementations of paymaster to be diversity and decentralization for the whole ecosystem like many versions of Ehtereum clients.
+ 3. It related to mass adoption, a huge oppotunity for UX improvement using product service. We have some product strength on that.
+ 4. Other reasons
+ it is more closer to money(gasfee) and has a simple business model: sell 50 cents gas with convenience service for 70 cents price.
+ We can expand more services to Applications and Users and build a small circle ecosystem like liquidity service and gas tank or cross chain gasless service.
+ We will build Ethereum Layer1 node and Layer2 node to simulate the transactions and be sure security, it also can expand some security service like support anti-censorship or build a FULL NODE FOR ESCAP CAPSULE OF LAYER2. Or some contract analysis service to improve the safe for users.

### How
+ Three phases
+ 1. Basic paymaster
+ 2. Be composable with Application Accounts including aggregate other third party paymaster services.
+ 3. Be entrance for mass adoption users with AirAccount.

### Design of Basic Paymaster
+ APIs like Pimlico follow the opensource paymaster contract and more.
+ Build a basic ERC4337 wallet to send user operations and send to buldler with or without a paymaster service.
+ Improve the backend service, like what Jaydon mentioned in the meeting.
+ Basic APIs(connect with bundler or 7560 later)
+ Gas price calculation
+ Floating pricing module
+ Signature service
+ Simulation service(basic)
+ Lay1 and Layer2 node running service(a FULL NODE?)

### Expand Paymaster
+ Complex package for the Game applications or others.
+ Basic P2P service flow like credit card payment.
+ Gas tank with Application liquidity.
+ More...

### Mass adoption
+ Cross chain services with improved UX.
+ Dig into the User side UX.
+ Deep insight into Application account service.
+ More...