Mnemonic integrity
Check word count and BIP-39 checksum locally. The phrase never leaves your browser.
Waiting for input
Local execution
OWN THE KEYS.READ THE CHAIN.MOVE ON SIGNAL.®
A local-first Web3 workbench for people who would rather verify than trust.
KEY MATERIALCHAIN INTELLIGENCELOCAL UTILITIES
Open the forge↓HOW CONTROL BECOMES CONFIDENCE
Complex systems should not feel obscure. chaintool turns raw Web3 mechanics into instruments you can inspect, understand and use without surrendering control.
KEY FORGE
Make it here.
Keep it here.
Before you generate
Use this for testing, learning and fresh wallets. For meaningful funds, create keys on a hardware wallet or air-gapped device.
Network recipe
DERIVATION
m/44'/60'/0'/0/021 EVM chains · secp256k1Output
Cryptographic engine ready
LOCAL
Output materializes here
Web Crypto entropy · no request · no storageUseful before
you sign.
Fast local checks designed to become habits, not dashboard clutter.
Native unit converter
Translate human amounts into exact onchain base units before you build a transaction.
WHAT COMES NEXT
Tools worth
returning for.
01LIVE↗02WORKING↗03LOCAL↗04VERIFIED↗05NO API KEY↗
Fee Window
Live gas and recent block pressure with a simple send-now or wait signal.
Approval Radar
Read an exact ERC-20 allowance and build zero-allowance revoke calldata.
Transaction Lens
Turn common calldata into a plain-language intent and risk report.
Faucet Router
Curated testnet faucets, public RPCs, explorers and chain IDs.
Developer Tools
Local crypto utilities, RPC probes, contract inspection and deployment helpers.