Blockchain Utils

Ethereum and blockchain utilities. Gas estimators, ABI tools, ENS lookups, wallet validation, and Solidity helpers — all client-side.

Gas & Transactions

Block Estimator

Estimate which block number corresponds to a given Unix timestamp, and vice versa.

Calldata Cost

Compute gas cost of calldata bytes — zero vs non-zero — for any hex payload.

Gas Estimator

Calculate transaction cost in USD from gas limit, gas price in gwei, and current ETH price.

Transaction Decoder

Decode raw Ethereum transaction hex into human-readable fields. Supports legacy, EIP-2930, and EIP-1559.

Unit Converters

ERC-20 Unit Converter

Convert between raw token amounts and human-readable values for any decimal count.

Wei / Gwei / Ether Converter

Convert between wei, gwei, and ether across all 7 Ethereum denomination levels.

Wallets & Addresses

CREATE2 Address

Compute deterministic contract addresses from deployer, salt, and init code hash.

HD Wallet Derivation

Explore BIP-32 and BIP-44 derivation paths, generate child keys, and view resulting addresses.

Vanity Address Estimator

Calculate how long it would take to mine a vanity address with a given prefix or suffix.

Wallet Address Validator

Validate Ethereum, Bitcoin, and Solana addresses with checksum verification.

ABI & Solidity

4-Byte Selector Lookup

Compute EVM function and event selectors, or look up known signatures for a 4-byte hash.

ABI Encoder / Decoder

Encode Solidity function calls and decode transaction input data using a contract ABI.

Merkle Tree Visualizer

Build Merkle trees from input data, create inclusion proofs, and verify data integrity.

Solidity Storage Layout

Visualize how Solidity state variables pack into EVM storage slots and detect packing opportunities.

ENS (Ethereum Name Service)

ENS Availability

Check if an .eth name is available for registration, or view the owner and expiry date.

ENS Lookup

Resolve an ENS name to its Ethereum address, or reverse-resolve an address to its ENS name.

ENS Namehash

Compute the EIP-137 namehash for any ENS name with step-by-step Keccak-256 hashing.

ENS Record Viewer

View all records on an ENS name: addresses, text records, content hash, avatar, and more.

ENS Registration Cost

Calculate registration and renewal costs for .eth names based on length and duration.

ENS Subname Explorer

List all subnames registered under any parent ENS name and check their resolution targets.

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