Now I See Web3
on-chain data analyzer
Onchain data is complex.
Strange strings beginning with 0x,
hashes that conceal their meaning,
encoded values, and layers upon layers of structured JSON.
Ever wondered what kind of data is actually living onchain in Web3?
Now I See Web3 turns unreadable onchain data into something humans can finally inspect, understand, and work with...!
This is a pure developer debugging tool. It has no wallet connection, no token transfers, no payments, and no cryptocurrency investment features — only on-chain data inspection.
Transaction Analyzer
Search a tx hash across chains in parallel. Displays tx details, decoded calldata, and event logs.
OPEN →Calldata Decoder
Paste raw calldata hex and get a human-readable function name, signature, and parameters.
OPEN →Error Decoder
Paste revert data to decode Error(string), Panic(uint256), or any custom Solidity error.
OPEN →On-Chain Developer Tools for EVM Blockchains
Now I See Web3 is a free, open-source suite of on-chain data analysis tools built for Ethereum and EVM-compatible blockchain developers. Every tool on this platform is designed to solve a specific pain point in the developer workflow: inspecting transactions, decoding calldata, understanding revert errors, and looking up function selectors.
When you interact with smart contracts on Ethereum, Arbitrum, Optimism, Base, or any EVM chain, the underlying data is ABI-encoded into compact hexadecimal strings. These raw bytes are designed for the EVM to process, not for humans to read. Now I See Web3 bridges that gap by converting opaque hex data into structured, human-readable output.
The Transaction Analyzer searches a transaction hash across 14+ EVM chains simultaneously, returning decoded calldata, event logs, gas usage, and cross-message status for OP Stack withdrawals and deposits. The Calldata Decoder takes raw calldata hex and identifies the function being called along with all its parameters. The Error Decoder translates Solidity revert data into readable error messages, supporting standard Error(string), Panic(uint256), and custom error types.
For developers who need to work with function selectors directly, the Function Selector Generator computes 4-byte selectors from Solidity signatures, and the Search Function Selector performs reverse lookups to find all known functions matching a given selector from our ABI archive. The Event Topic Hash Generator calculates 32-byte keccak256 topic hashes for Solidity event signatures.
All tools are completely free with no wallet connection, no API keys, and no account required. The project is open-source and available on GitHub. Whether you are debugging a failed transaction, auditing a smart contract interaction, or learning how ABI encoding works, Now I See Web3 gives you instant visibility into what is happening on-chain.