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Given the sector we operate in and the potential outcomes of specific scenarios, security is one of our top priorities. That’s why Zyfai is built on Safe7579 Smart Accounts instead of shared vaults.

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What Are Smart Accounts?

On Ethereum, there are two types of accounts: Externally Owned Accounts (EOAs), such as MetaMask or Rabby wallets, and Smart Contract Accounts. Popularized by the ERC-4337 standard, Smart Contract Accounts can send and receive tokens just like EOAs, but rely on programmable code rather than a single private key to secure and recover wallet information. The benefits include:
  • Transaction batching: multiple actions executed in a single transaction
  • Gas sponsorship: fees covered by paymasters on behalf of the user
  • Session Key support: granular, time-limited permissions for automated execution
When you deposit funds to Zyfai, a fresh Smart Account is automatically deployed on your behalf to manage the capital you deposited. You retain full ownership at all times.

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Why Smart Accounts Over Vaults?

By design, Zyfai uses personalized Smart Accounts rather than a shared vault for three reasons:
  1. Self-custodial by default: each user has their own Smart Account, there is no shared pool where all funds sit in a single contract.
  2. Direct protocol interaction: your Smart Account interacts directly with the underlying DeFi protocols, not through an intermediary vault.
  3. Front-end independent: your Smart Account interacts with protocol contracts directly, not through their front-end interfaces. Even if a protocol’s front-end is compromised, your funds remain unaffected.
Smart Accounts are audited multiple times and battle-tested across the Ethereum ecosystem, reinforcing our decision to build on this technology.

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What Does Zyfai Use Exactly?

Zyfai uses the Safe7579 Adapter by Rhinestone: a smart contract that makes Safe Smart Accounts compliant with ERC-7579. Safe secures over $100B in crypto assets globally. Rhinestone is the author of ERC-7579 itself. The entire stack is audited and battle-tested. Since ERC-7579 is a superset of ERC-4337, the Safe7579 Adapter ensures full compliance with both standards. Technically, the Adapter serves two roles:
  • Safe Module: extends Safe account functionality to support ERC-7579 modules
  • Fallback Handler: handles functions like validateUserOp that are required by ERC-7579 but not natively supported by Safe.
A launchpad contract facilitates the setup of new accounts: when you connect to Zyfai, a fresh Safe7579 Smart Account is deployed for you, exclusively controlled by your EOA. All deployment and gas fees are sponsored by Zyfai.

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How It Works

  1. Account Creation: when a user or institution deploys a Zyfai Agent, a unique Safe Smart Account is created onchain under their ownership.
  2. Capital Isolation: all deposited funds reside exclusively within this account. Assets are never pooled or commingled.
  3. Permissioned Execution: the Safe is configured with a Session Key, scoped through the Security Proxy System, which grants the Zyfai Agent permission to execute only pre-approved transactions.
  4. Full Sovereignty: The owner retains the full control over deployed Safe Smart Account, enabling them to directly access, manage, or withdraw funds via the Safe UI at any time, independent of Zyfai.