Gas Fee Pool Hat

【Introduction of Gas Fee Pool Hat】

• Gas Fee Pool Hat is that gas fee is paid by relayer instead of users by utilizing rDAI and Biconomy.
  • Amount that relayer pay for gas fee is provided from interest income via rDAI.
  • Users generate Interest income via specific Hat of rDAI
  • Users are staking generated "interest income" into Gas Fee Pool Hat .
  • Users can pay "Gas Fee" of users with generated "interest income" instead of users.
    • This structure is realized by "Meta-Transaction" by using Biconomy .

 

【User Flow】

[User Flow Guide of Gas Fee Pool Hat]

https://medium.com/@masanoriuno_75621/user-flow-guide-of-gas-fee-pool-hat-bfb713f3fcbc

[User Flow (briefly)]

• ① Register Relayer Address (※ Attention: allow onlyOwner address to execute this function. So that you need to specify owner address before you execute migrate：https://github.com/masaun/gas-fee-pool/blob/master/migrations/2_deploy_mexa.js#L9 )

• ② Create new Hat for gas-fee-pool (=Called "gas fee pool Hat" )
  • At that time, user specify proportions between user's wallet address and registered Relayer Address
  • By specifying above, generated interest will be pooled into gas-fee-pool-Hat every time which interest are generated. (Pooled amount into gas-fee-pool-Hat is amount that proportion is specified)

• ③ Redeem & Transfer (from "gas fee pool Hat" to "RelayerAddress" )

• ④ Execute test function (Push a button of "Set Text" in the page of "Mete-Transaction")
  • At the same time with executing this function, Gas Fee is paid by registered relayer via meta-transaction of Biconomy. (Registered relayer pay with pooled interest income for gas fee which happen by executing test function)

 

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【Setup】

Versions / Environment

$ truffle versions

  - Truffle v5.1.23 (core: 5.1.23)
  - Solidity v0.5.16 (solc-js)
  - Node v12.13.0
  - Web3.js v1.2.1

Setup wallet by using Metamask

1. Add MetaMask to browser (Chrome or FireFox or Opera or Brave)
   https://metamask.io/

2. Adjust appropriate newwork below

Kovan Test Network

 

Setup backend

1. Deploy contracts to Kovan Test Network

(root directory)

$ npm run migrate:Kovan

 

Setup frontend

1. Add an .env file under the directory of ./client.

2. Add SKIP_PREFLIGHT_CHECK=true to an .env file under the directory of ./client.
   （Recommend to reference from ./client/.env.example）

3. Execute command below in root directory.

$ npm run client

4. Access to browser by using link

http://127.0.0.1:3000/gas-fee-pool

 

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【References】

• [rDAI]

  • [MetaCartel - Dragon Quest]

    • Best rDAI Integration or Tool
      https://explorer.bounties.network/bounty/3921

  • [rDAI / Tutorial]

    • rDAI Basics: A Tutorial on Programming Interest with DeFi
      https://medium.com/@victorrortvedt/rdai-basics-a-tutorial-on-programming-interest-with-defi-458baab9477a

  • rtoken-contracts：
    https://github.com/rtoken-project/rtoken-contracts

  • rDAI explorer：
    https://explorer.rdai.money

  • Video of rDAI with eth.build
    https://www.youtube.com/watch?v=nEC2kadoLms

  • [Use Case]：Existing dApp（Dapps built on rDAI include）
    https://app.rdai.money https://rtrees.dappy.dev https://highpriests.rdai.money

• [Biconomy]

  • [Money Legos A Global Online DeFi Hackathon]
    https://moneylegos.devfolio.co/#prizes

  • [Repos]

    • SmartContract / Mexa
      https://github.com/bcnmy/mexa

    • Mexa-SDK
      https://github.com/bcnmy/mexa-sdk

    • Mexa Example Projects
      https://github.com/bcnmy/mexa-examples