Free crypto tools
that just work.
No bullshit.
A free, browser-native toolkit for everyone working on-chain. Convert units, validate addresses, calculate gas — 100% client-side, no wallet connection, no API keys, no friction.
Built for the EVM stack.
ETH unit converter
Convert between wei, gwei, szabo, finney, ether and everything in between. BigInt-precise, no floating point trickery.
Address validator
EIP-55 checksum verification and contract-vs-wallet detection across 11 EVM chains. Paste any address, get the canonical form.
Gas calculator
Estimate transaction costs across mainnet, L2s, and rollups. Live basefee, priority fee modeling, USD conversions.
Token decimals
Look up ERC-20 decimals, total supply, and metadata for any token on any chain. Paste contract address, get truth.
EIP-55 batch checker
Paste a whole list of addresses and get every one checksummed, validated, and flagged. Local keccak, handles hundreds at once.
Gwei to USD
Turn any gwei gas price into dollars for a transfer, swap, or custom gas amount, using the live ETH price.
Built for Bitcoin only.
Satoshi converter
Convert between satoshi, bits, mBTC, and BTC with BigInt precision, plus a live USD readout. Browser-only.
Bitcoin address validator
Validate any Bitcoin address — legacy (1…), P2SH (3…), native SegWit (bc1q…), Taproot (bc1p…). Bech32 and Base58Check verified locally.
Bitcoin fee calculator
Estimate transaction fees from live mempool data — fastest, 30-min, 1-hour, economy tiers — across SegWit, Taproot, and legacy tx shapes.
Halving countdown
Live countdown to the next Bitcoin halving — current block height, blocks remaining, ETA, and the full reward schedule.
Block date converter
Turn any block height into an estimated date, or a date into a height. Halving-anchored history, live tip, 10-minute target ahead.
Lightning invoice decoder
Decode any BOLT11 invoice locally: amount, memo, payment hash, expiry, and destination. Spec-vector verified, zero network calls.
Script disassembler
Raw Bitcoin script hex to opcodes, with standard templates recognized and OP_RETURN payloads read out. The full opcode table, local.
Locking scripts
Paste an address, see the exact script that locks its coins and what a spender must reveal: keys, signatures, or a Taproot path.
Transaction decoder
Paste raw transaction hex and read every input, output, witness, and address, with txid, wtxid, vsize, and weight computed locally.
Tuned for Litecoin's pace.
Litecoin converter
Convert between litoshi, photon, mLTC, and LTC with BigInt precision, plus a live USD readout.
Litecoin address validator
Validate any Litecoin address — legacy (L…), P2SH (M…), SegWit (ltc1q…), Taproot (ltc1p…). Flags deprecated 3-prefix addresses that collide with Bitcoin.
Litecoin fee calculator
Live LTC mempool fees — 5 tiers across SegWit, Taproot, and legacy shapes. 2.5-minute blocks mean fees stay low almost continuously.
Litecoin halving countdown
Live countdown to the next Litecoin halving — current tip, blocks remaining, ETA, and the full LTC reward schedule.
Made for the Solana runtime.
Solana converter
Convert between lamport, μSOL, mSOL, and SOL with BigInt precision, plus a live USD readout.
Solana address validator
Decode and validate any Solana address. Wallets, programs, mints, and PDAs all share the same 32-byte shape. The validator confirms length and known-program identity.
Solana SPL token lookup
Read on-chain SPL mint info — decimals, supply, mint authority, freeze authority. Supports both SPL Token and Token-2022 programs.
Solana rent calculator
Compute the rent-exempt minimum balance for any Solana account by data size in bytes. Returns lamports, SOL, and live USD.
Priority fee estimator
Live prioritization fees from the last 150 slots: quiet floor to hot-account percentiles, priced out against your CU budget.
Compute unit guide
What compute units are, what common transactions consume, and what any CU budget plus tip costs in lamports, SOL, and USD.
Wired for TRON's traffic.
TRON converter
Convert between SUN and TRX with BigInt precision, plus a live USD readout. SUN is TRON's 10⁻⁶ smallest unit.
TRON address validator
Validate any TRON address and convert between T-prefix Base58Check, 41-prefix hex, and EVM 0x form. Pure local, no signup.
TRC-20 token lookup
Read on-chain TRC-20 metadata — name, symbol, decimals, total supply — for USDT, USDC, JST, BTT and any TRON contract.
TRON fee calculator
Estimate TRON transaction costs in TRX and USD — including the famously cheap USDT transfer fee on TRC-20. Energy + bandwidth + activation, all in one place.
Sharp tools, any chain.
Hash playground
Keccak-256, SHA-256, double-SHA and friends, computed locally on every keystroke. Text or raw hex input, nothing uploaded.
Cheapest USDT network
Live, ranked cost of one USDT transfer on Ethereum, TRON, and Solana, converted to USD from live gas, energy prices, and lamports.
Calldata decoder
Paste hex transaction input and read the function and arguments. Common selectors recognized; any signature decodable, all local.
ENS lookup
Resolve .eth names to addresses, reverse-resolve with round-trip verification, and compute EIP-137 namehash locally.
Event topic decoder
Match topic0 hashes to standard event signatures, hash any signature, and read topics and data words from raw logs.
EIP-712 hash calculator
Paste typed-data JSON and get the domain separator, struct hash, and final 0x1901 signing digest, verified against the spec example.
▸ /ethos
Crypto tools shouldn't ask for your wallet, phone home, or hide behind a paywall. Just math, in your browser, free.