One-transaction ERC-4626 vault deposits via Uniswap Permit2 — no separate approve needed.
Price: $6.99 | Store: vault-forge | Product #7
Permit2VaultAdapter is a stateless adapter contract that enables users to deposit into any ERC-4626 vault in a single transaction, even for tokens that don't support EIP-2612 permit (like USDC, USDT, DAI on mainnet).
Standard ERC-20 token deposits into vaults require two transactions:
1. token.approve(vault, amount) — user pays gas, waits for confirmation
2. vault.deposit(amount, receiver) — user pays gas again
This is the #1 UX complaint in DeFi. Users abandon flows, gas is wasted, and protocols lose depositors.
With Permit2, the flow becomes:
1. One-time: User approves Permit2 contract for the token (or it's already approved)
2. Off-chain: User signs a Permit2 message (gasless, instant)
3. One tx: Adapter pulls tokens via Permit2 signature → deposits into vault → user receives shares
User signs Permit2 message (off-chain, gasless)
│
▼
┌─────────────────────────┐
│ Permit2VaultAdapter │
│ 1. Pull tokens via P2 │
│ 2. Approve vault │
│ 3. vault.deposit() │
│ 4. Reset approval │
│ 5. Emit event │
└─────────────────────────┘
│
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