Blockchain Tools

Blockchain tools for crypto & Web3. Generate wallets, validate addresses, decode transactions, and explore blockchain data securely.

21 tools available

Blockchain Tools 20

DCA Calculator

Free DCA simulator: model crypto dollar-cost-averaging across 3 price-path scenarios. See harmonic-mean average cost, ROI, DCA vs lump-sum chart.

Crypto Profit/Loss Calculator

Calculate crypto profit, loss, ROI and break-even with buy/sell fees. Token-decimal-aware, BigInt-precise, 100% private, with CSV/JSON export.

Impermanent Loss Calculator

Calculate impermanent loss for Uniswap V2/V3, Balancer weighted & Curve pools. Compare LP vs HODL, add fee-APR break-even, export CSV. Free, in-browser.

ENS Resolver

Forward & reverse ENS resolver: .eth to EIP-55 address, primary name, avatar, multi-chain SLIP-44 & text records. Read-only, no wallet, fully client-side.

Blockchain Timestamp Converter

Convert Unix timestamps (seconds or milliseconds) to dates and back for Ethereum, Bitcoin and EVM chains, with a Solidity duration calculator.

Keccak SHA3 Hasher

Free keccak256 online tool: compute 4-byte function selectors, event topic0 hashes, and EIP-55 checksum addresses. Keccak-256/512 and SHA3 in-browser.

ABI Encoder / Decoder

Decode Ethereum calldata and encode function calls online. Resolves unknown 4byte selectors, decodes tuples, structs, arrays and multicall on any EVM chain.

Checksum Address Converter

Validate, fix and batch-convert Ethereum addresses to EIP-55 checksum format. Keccak-256 mixed-case validation for ETH, BSC, Polygon. 100% client-side.

EVM Vanity Address Generator

Generate EVM vanity addresses client-side - private keys never leave your browser. Open-source secp256k1/Keccak-256, EIP-55 checksum, batch CSV/JSON export.

Lido Rewards Tracker

Track Lido stETH liquid staking rewards across multiple wallets. Daily rebase APR, compounded APY, net-of-fee yield and CSV tax export in USD/EUR/GBP.

Bitcoin Unit Converter

Convert BTC, satoshi, mBTC and bits with exact integer-satoshi math. Sat/vByte fees, millisatoshis, user-set fiat rates. Free, offline, no data sent.

EVM Transaction Decoder

Decode EVM raw tx hex client-side: read the function selector and ERC-20 calldata, spot approval-drain phishing, and verify EIP-1559 gas before you sign.

Staking Rewards Calculator

Calculate ETH staking rewards with live DefiLlama APY from Lido, Rocket Pool, Ether.fi, Aave V3. Net-of-fee daily, monthly, yearly. Private, in-browser.

Tokenomics Chart Builder

Build ERC-20 tokenomics pie charts with exact BigInt token math. Set vesting, TGE unlocks, decimals and export the allocation table to CSV or JSON.

BIP39 Mnemonic

Generate or validate BIP39 seed phrases (12-24 words), apply an optional passphrase (25th word), and derive the PBKDF2-HMAC-SHA512 512-bit seed hex.

Crypto Logo Library

500+ crypto logos in transparent PNG for portfolio trackers, exchange & wallet UI. Symbol-to-logo search plus one-click bulk JSON/CSV manifest export.

Ethereum Unit Converter

Convert between Wei, Gwei, Ether, Szabo, Finney and all EVM units precisely. Calculate gas costs from transaction parameters. Free dev tool, instant.

Mnemonic to Address

Derive HD wallet addresses, private keys (WIF/hex) and xpub from a BIP39 mnemonic for Bitcoin, EVM, Solana, BCH and more. 100% client-side.

Solidity Function Selector

Compute Solidity 4-byte function selectors (method ID) and 32-byte event topic hash via Keccak-256. Canonical signature normalization, calldata template, lookup.

Wallet Address Validator

Validate any wallet address offline: Bitcoin Base58Check + Bech32, Ethereum EIP-55, Solana, Tron, Cardano, Stellar. Batch CSV/JSON export, no API, in-browser.

Calculators 1

Financial Calculators 1

Stablecoin Yield Comparator

Compare stablecoin APY from Aave, Compound, Sky, Ethena, Pendle and Coinbase side by side. Risk-adjusted ranking, fees, inflation and basis-point gaps.