Smart Contract Cost Estimator
Blockchain teams
Estimate deploy and per-function gas cost across EVM and Cosmos SDK chains.
EngineerOpen tool
Blockchain
Free blockchain developer tools for Solidity, EVM calldata, and tokens.
Encode and decode ABI parameters, validate Ethereum addresses, compute Keccak256 selectors, generate ERC token boilerplate, inspect Solidity storage layout, and produce BIP39 mnemonics. Browser only, no key handling on a server.
Showing 8 of 21 tools in Blockchain
Cost Engineering
Developer Utilities
Ethereum Address Validator (EIP-55)
Solidity engineers
Paste any Ethereum address to verify shape, length, and EIP-55 checksum. Returns the correct mixed case form.
EngineerOpen tool
Keccak256 Hash Generator
Solidity engineers
Compute Solidity keccak256 hashes for strings, hex bytes, or function signatures. Returns the 32 byte hash and 4 byte selector.
EngineerOpen tool
ABI Encoder & Decoder
Solidity engineers
Encode and decode EVM ABI parameters in your browser. Works for unverified contracts, raw calldata, and event logs.
EngineerOpen tool
BIP39 Mnemonic Generator & Validator
Blockchain teams
Generate or validate BIP39 mnemonic phrases of 12 to 24 words. Browser only. For testing and learning, never for real funds.
EngineerOpen tool
Solidity Storage Layout Visualizer
Architects and Solidity engineers
Plan Solidity storage packing slot by slot, spot wasted bytes, and derive mapping value slots via keccak256.
ArchitectOpen tool
Wei / Gwei / Ether Converter
Solidity engineers
Convert between wei, kwei, mwei, gwei, szabo, finney, and ether with full BigInt precision. Optional ETH to USD line, browser only.
EngineerOpen tool
Need help interpreting a result?
Bring your scenario to a strategy call and I will pressure test the assumptions with you.