AyAy Project

AyAy is account abstraction wallet (ERC-4337 compliant) for daily payments.

With the native interfaces, the payment process is as easy as PayPay, which is widely accepted at stores in Japan (more than 55 million downloads).

Payer can be offline!

Key Points

• AA Contracts
  • Business entity sponsors gas if only the payment is for it
  • Wallet has withdrawal limit to avoid a significant loss
• Use bluetooth when signing user operations so that consumers can be offline
• Signing key will never go out from the consumer app
• FaceID to approve payments

Structure

sequenceDiagram
  participant Consumer as Consumer (Swift)
  participant Business as Business (Swift)
  participant Server as Server (nodejs)
  participant Bundler as Bundler (stackup)

  Note over Consumer: Generate master wallet (EOA)
  Consumer->>Server: createAyAyWallet(master address)
  Server->>Consumer: AyAy wallet address
  Note over Consumer: Deposit ERC20 to the address
  Note over Consumer, Business: Bluetooth connection starts
  Consumer->>Business: Master address
  Business->>Server: createOp(address, amount)
  Server->>Business: unsigned op hash, op id
  Business->>Consumer: Request Payment (send hash/amount)
  Note over Consumer: Approve payment (FaceID)
  Consumer->>Business: sign hash with master key
  Business->>Server: op id, signature
  Server->>Bundler: send signed op
  Bundler->>Server: op hash
  Server->>Business: tx hash
  Business->>Consumer: AyAy! (payment completed)
  Note over Consumer, Business: Bluetooth connection ends

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Deployed contracts

Polygon mumbai

Name	Address	Note
EntryPoint	0x0576a174D229E3cFA37253523E645A78A0C91B57	Already deployed
AyAyFactory	0xc1C84de4313b270D0e2299C36D4D90ddfC3A7C9e
AyAyReceiver	0x17846F6BFA76c1D7D08873148C9813b6B1D98ce7	Each shop deploys
AyAyPaymaster	0xa7A67146470571E4183D8E9219DBb4674D831B55	Each shop deploys
AyAyWallet	0x1De29a647d9826232a55A84f9154F4fF3E396e14	One created from the factory
TestJPYC	0xF7f571309c7BFc2E6565cA6Ca13c093D78BcF90f	ERC20

Bunzz

• Each shop can easily deploy their own AyAyReceiver contract using Bunzz.
• Video example: https://drive.google.com/file/d/1fW2ILnVorL1Eq7uoa3GukV6VpoCuusYc/view

Future improvements

• Support multi chain
• Use NFC to make UX better

FOR EthTokyo Polygon Prize

Prize for Best Public Good with Account Abstraction or Gasless transactions

• UX optimization strategies

  To improve the UX of the AyAy project, the following points are important:

  • Offline Payment : Offline payments allow users to continue making payments even when they don't have access to the app. This reduces limitations on app usage and enables users to make payments more conveniently.

  • Elimination of Gas Fees : Eliminating gas fees associated with transactions is a significant improvement in UX as it reduces the cost of transactions for users and eliminates the complexity of managing gas fees.

  • Global Availability : The AyAy project aims to be available globally, allowing users to make payments with their preferred currency from anywhere in the world. This makes the app more accessible and convenient for users.

  • Multi-Currency Support : Multi-currency support is another significant UX improvement, as it allows users to make payments in their preferred currency, reducing the need for currency conversions and providing greater flexibility.

  • Limitation of Withdrawal Amounts : Setting limits on the amount that can be withdrawn from a wallet helps to improve the security of the app by reducing the potential loss in case of a security breach.

  • Improved Security : Improved security features such as Bluetooth-enabled signing, FaceID integration, and the use of AA contracts, help to ensure that user information is protected and transactions are secure. This is crucial in building trust with users and ensuring the app is widely adopted.

• Link to relevant sections of code with your account abstraction implementation. https://github.com/iharuya/ayay/tree/main/contract/contracts

Prize for Build #onPolygon in Public Pool Prize

• Link to our deployed smart contracts on Polygonscan

  Name	Polygonscan	Note
  EntryPoint	https://mumbai.polygonscan.com/address/0x0576a174D229E3cFA37253523E645A78A0C91B57	Already deployed
  AyAyFactory	https://mumbai.polygonscan.com/address/0xc1C84de4313b270D0e2299C36D4D90ddfC3A7C9e
  AyAyReceiver	https://mumbai.polygonscan.com/address/0x17846F6BFA76c1D7D08873148C9813b6B1D98ce7	Each shop deploys
  AyAyPaymaster	https://mumbai.polygonscan.com/address/0xa7A67146470571E4183D8E9219DBb4674D831B55	Each shop deploys
  AyAyWallet	https://mumbai.polygonscan.com/address/0x1De29a647d9826232a55A84f9154F4fF3E396e14	One created from the factory
  TestJPYC	https://mumbai.polygonscan.com/address/0xF7f571309c7BFc2E6565cA6Ca13c093D78BcF90f	ERC20

• Link to our tweet

  https://twitter.com/AyAy_wallet/status/1647332790910996480