Blockchain Lab Tools

Live gas prices and transaction cost in USD across EVM chains, Bitcoin sat/vB and Solana priority fees, read directly from public RPCs.

Exact big-number conversion between wei, gwei, ether, satoshis, BTC, lamports and SOL — no floating point errors.

Encode Solidity function calls, decode calldata, compute 4-byte selectors and event topics, and look up unknown selectors in the openchain / 4byte signature databases.

Validate EIP-55 checksums, resolve ENS names (forward and reverse), and inspect any address on Ethereum, Base, Arbitrum, OP, Polygon, BNB or Avalanche: balance, nonce, contract code, proxy implementation, EIP-7702 delegation and ERC-20 metadata.

Paste a transaction hash to decode the function call, arguments, event logs, status and fees on Ethereum, Base, Arbitrum, Polygon, OP Mainnet, BNB Chain and Avalanche via public RPC.

Hash text or hex with keccak256, sha256 and ripemd160, and build OpenZeppelin-compatible Merkle trees (StandardMerkleTree / SimpleMerkleTree) with root and proofs for airdrops and allowlists.

Compute Solidity storage slots for mappings, nested mappings, dynamic arrays, ERC-7201 namespaces and EIP-1967 proxy slots — then read the live value from any EVM chain.

Search every Ethereum EIP and ERC and every Bitcoin BIP by number, title or status. Rebuilt nightly from ethereum/EIPs, ethereum/ERCs and bitcoin/bips.

Search 2,700+ EVM networks by name or chain ID, test public RPC latency live from your browser, and add a network to MetaMask/any EIP-3085 wallet.

Search the Uniswap default token list by symbol, name or address across Ethereum, Base, Arbitrum, OP, Polygon, BNB and Avalanche, and verify any token's on-chain name, symbol, decimals and supply.