Authorized use only. Use this tool solely on systems, tokens, and assets you own or are explicitly permitted to test — credential extraction, signature forging, and unauthorized access are prohibited by our Acceptable Use Policy.

EVM Tools

Optimism Developer Tools

The original Optimistic Rollup and home of the OP Stack. Our EVM tools handle Optimism contracts identically to Ethereum — same addresses, same ABI encoding, same Keccak-256 hashing.

Chain details

Chain ID

10

Native token

Ether (ETH)

Type

L2

Gas

Gas ~20-100x cheaper than Ethereum L1

RPC endpoint

https://mainnet.optimism.io

Block explorer

https://optimistic.etherscan.io

Tools for Optimism

Every tool below works on Optimism and every other EVM chain — read any Optimism contract, decode Optimism calldata before signing, or convert wei to ETH with exact math. All client-side — keys and payloads never upload.

EVM Contract Reader

Call view functions on any Optimism contract via your own RPC

EVM Calldata Decoder

Decode Optimism transaction input — function and arguments, before you sign

Transaction Decoder

Break out a signed Optimism transaction: sender, gas, fees, calldata

ABI Encoder & Decoder

Encode calldata for Optimism contract interactions

Function Selector Calculator

Compute 4-byte selectors for function signatures

EVM Unit Converter

Convert wei, gwei, and ETH with BigInt-exact math

Vanity Address Generator

Generate custom addresses — same key works on Optimism and every EVM chain

Address Checksum (EIP-55)

Validate and checksum Optimism addresses to catch typos

CREATE2 Address Calculator

Derive deterministic contract addresses before deploying to Optimism

EIP-1967 Proxy Slot Checker

Read implementation and admin slots of Optimism proxies

Storage Slot Calculator

Compute Solidity storage slots for Optimism contract state probes

Uniswap Math Calculator

v2/v3/v4 pool math — amounts out, ticks, sqrtPrice

Uniswap v4 Hook Calculator

Map hook addresses to their permission flags

Keccak-256 Hasher

Hash with the exact algorithm used by the EVM

Multi-Chain Wallet Generator

Generate keys and Optimism addresses from one mnemonic

ENS Namehash Calculator

Derive EIP-137 namehash values for ENS names

Solidity to Opcodes

Compile Solidity and inspect the EVM assembly

Popular tokens on Optimism

USDC

0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85

6 dec

OP

0x4200000000000000000000000000000000000042

18 dec

WETH

0x4200000000000000000000000000000000000006

18 dec

Other EVM chains

All tools work on every EVM chain — pick yours: