A second look , before you sign.

Onay* is a signing companion for Ethereum. It checks every transaction on your computer before your wallet signs it.

Read only
Holds no keys
Local first

Desktop App

Version 0.1.0 · 27 October 2026

macOSApple Silicon .dmg11.3 MB Debian, Ubuntu .deb13.6 MB Fedora, openSUSE .rpm13.6 MB

Release notes SHA256SUMS

Browser Extension

Coming soon

Download

app.swap.example

TradeExplorePool 0xA1b2…9cD4

Sell

1 ETH ▾

$2,332.50

Buy

2,330.12 $USDC ▾

$2,330.12

↓

Swap

Account 1Ethereum

Transaction request

Request fromapp.swap.example

Interacting with0x66a9893c…e1dBA8Af

Data

0x3593564c00000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000a0000000000…

Network fee0.00041 ETH

CancelConfirm

? ? ?

?What am I signing?

✓Now I know what I sign.

Ethereum

app.swap.example asks to sign

✓

Chain data verified

Proven at block 26,300,525

✓

Simulated: your balance changes

− 1 ETH

+ 2,330.12 USDC

0x66a9…UniversalRouter execute✓

├0x0000…PoolManager swap✓

└0xA0b8…USDC transfer✓

└0x4350…FiatTokenV2_2✓

✓

UniversalRouter 0x66a9…A8Af

✓Source code verified

All 4 contracts recompiled here.

✓On the Uniswap deployments list

✓USDC on your token list

✓

ERC-7730 Clear Signing

Swap 1 ETH for at least 2,318.47 USDC

✓

Compare with your wallet

0x7a3f…c91e

✓ Same on device

✓Every check passed.

‹

ERC-8213 Calldata Digest

0x7a3f…c91e

›

claim-rewards.example

XYZ

Claim your airdrop

2,500 XYZ is waiting for 0xA1b2…9cD4

Claim now

Account 1Ethereum

Transaction request

Request fromclaim-rewards.example

Interacting with0x9f2c41e7…77b0a13e

Data

0xac9650d80000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000…

Network fee0.00012 ETH

CancelConfirm

? ? ?

?What am I signing?

!Glad I checked first.

Ethereum

claim-rewards.example asks to sign

!A known phishing site

✓

Chain data verified

Proven at block 26,300,525

Simulated: your balance changes

− 1,850 USDC

+ 2,500 XYZ worthless, on no list

0x9f2c…multicall

├0xA0b8…USDC transferFrom

└0x5e1f…XYZ transfer

Source code not verified

No source to recompile. What it does cannot be checked.

ERC-7730 Clear Signing

Unknown. Without source code there is nothing to decode.

About this contract

On a block list. Deployed 2 hours ago.

Do not sign. Reject this request in your wallet.

A swapA fake airdropPaused