# ETHPaymaster

> In contrast to the business-centric, proprietary, and centrally-managed Relay Paymasters, ETHPaymaster offers a community-driven, open-source, decentralized framework designed to sponsor each transaction.
> [Github](https://github.com/AAStarCommunity/ETHTaipei2024)

## Introdution

Basing on ERC 4337, we try to revolutionize the value that paymasters presents.
Nowadays, paymasters are monopolized by large, centralized companies, the top 3 of which holds 90% market share *( see [bundle bear](https://www.bundlebear.com/paymasters/all) )*


**Although the Paymaster contracts itself might be open-sourced, but the infrastruture required to run a Paymaster, such as backend server, relays, etc, is often close-coursed and business-centered, which lies against the value represented by Blockchain.**

**Therefore, we pioneer the grounding work of keeping Paymasters open. And to prove our compatibility, we build our solution on Sepolia, Linea, Optimism, etc. chains.**
Also, we support **Dyson Finance** auto reinvest and dual investment by pre-gas deposit.

## Features

| Category | Our Community Paymasters | Current Centralized Paymasters |
| --------------- | ---------------------------------------------------------------------------------------- | ------------------------------- |
| Contract | Open-Sourced, Highly customizable | Open-sourced |
| Backend & Relay | Open-Sourced, Provided by simple docker image and SDKs | Close-sourced |
| Frontend | Open-Sourced, Provided by Google extensions | Close-sourced, not customizable |
| Censorship | Everyone can build their Paymaster from scratch with simple steps with community support | Company-Controlled |

## Overview Workflow of Account Abstraction


### Here we illustrate our differences

1. The Paymaster Relay are usually the profit source of company, where our main contribution is.
2. According to the graph, we provide **Paymaster Relay and Backend, Signature Signing Service, Frontend SDK, Paymaster Contracts.**

## Dyson Finance Support
>[Paymaster Invest Contract](https://github.com/AAStarCommunity/ETHTaipei2024/blob/main/Contract/contracts/PaymasterV1Invest.sol)


1. To pay gas, users need to deposit tokens first in Paymaster Contract (ERC20, etc)
2. In the Contract, the Paymaster directly invests the deposit to Dyson Finance for dual investment.
3. When UserOperations are submitted and the Paymaster is called, it withdraws the investment.
4. After paying the gas, the Contract auto-reinvests the deposit for interests.

## Addresses

// polygon mumbai
0x5AD784d1deAc1f3CC34eB5726e73e19C3FEE5f28
// optimism sepolia
0xa5d3E13f26D16A4Af2AEb9f5b6f6a2b7029321Fd
// linea goerli
0xa5d3E13f26D16A4Af2AEb9f5b6f6a2b7029321Fd