the web3 dev toolbox
your #1 spot for evm dev tools. free, instant, private.
transaction inspectorpaste a tx hash: chain found automatically, everything decoded.
contract inspectorwallet or contract? proxy implementation, clones, 7702, token info.
ENS lookupname ↔ address, avatar, x, github and website records.
selector & topic calculatorsignature → 4-byte selector, event topic0, error selector. and back.
calldata decoderpaste tx input data, get the function and every argument, decoded.
revert reason decoderturn 0x08c379a0… and panic codes into plain english.
ABI encodersignature + arguments → calldata, abi.encode or encodePacked.
ABI to interfacepaste an abi, get a solidity interface with structs.
keccak256 hasherkeccak256 and sha256 of text or raw hex bytes.
hex converterhex ↔ decimal ↔ binary, text ↔ hex ↔ bytes32, two’s complement.
storage slot calculatormapping and array slots, erc-7201 namespaces, proxy slots.
contract address calculatorpredict deploy addresses from deployer + nonce, or salt + initcode.
merkle tree builderallowlist or airdrop rows → root and proofs, openzeppelin style.
unit converterwei, gwei, ether, and any decimals: usdc 6, wbtc 8.
gas cost calculatorgas units × live gas price → cost in eth and usd, per chain.
live gas trackerlive gas on 12 chains, what a transfer costs, cheapest chain now.
HyperEVM big blockscheck and switch an address between big and small blocks.
address checksumvalidate an address and get its eip-55 checksum.
unix timestamp converterblock.timestamp ↔ date, durations in seconds, relative time.
signature verifierwho signed this? personal_sign, eip-712, split and compact.
need the contracts, not just the tools?
solidity for apps & games: foundry-tested, gas-aware, handed over with docs. haze is open for freelance.