Check ETH balance for any Ethereum address. Returns balance in ETH (not wei). Use for quick portfolio checks or verifying funds before a transaction. Returns: {address: string, balance_eth: string}.

List all ERC-20 token balances held by an Ethereum address. Returns token name, symbol, contract address, and human-readable amount for each token. Requires ETHERSCAN_API_KEY env var. Supports pagination for wallets with many tokens. Use get_erc20_transfers as fallback if no API key.

Look up a single transaction by its hash. Returns from, to, value (ETH), gas limit, gas price (Gwei), nonce, input data, and block number. Use when you have a specific tx hash and need full details. For bulk transactions, use get_transactions_by_address instead.

List normal (external) transactions for an Ethereum address. Returns value (ETH), direction (IN/OUT), gas price, function name, date, and status for each tx. Paginated, newest first. For ERC-20 transfers, use get_erc20_transfers. For contract-to-contract calls, use get_internal_transactions.

List ERC-20 token transfer events for an address. Returns token name, symbol, amount (human-readable), direction (IN/OUT), date, and contract address for each transfer. Filter by contract address to track a specific token. Use get_token_balances for current holdings instead.

List internal transactions (contract-to-contract calls) for an address. These are transactions triggered by smart contracts, not direct EOA transfers. Returns value (ETH), direction, type (call/create), date, and hash. Use for tracing DeFi interactions or contract execution flows.

Fetch the ABI for a verified smart contract. Returns a summary: function count, event count, and a list of all functions with their signatures and state mutability. Includes a truncated raw ABI (2000 chars). The ABI is required for calling contract methods or decoding transactions. Use get_transaction to see raw input data first.

Get current Ethereum gas prices from Etherscan oracle. Returns three tiers: Safe Low (turtle, cheapest), Standard (car, recommended), Fast (rocket, urgent) all in Gwei. Also shows base fee, last block, and estimated ETH cost for a simple 21k-gas transfer. Use before sending any transaction to set appropriate gas.