Use when you have a token contract address and need to know what it is: reads name, symbol, decimals and totalSupply straight from the contract (one multicall) on Base or Ethereum, confirms there is contract code at the address, and adds a Chainlink USD price when one exists for the symbol. Answers 404 (not charged) when the address is not a token. Paid tool: x402 USDC on Base, $0.001 per successful call; call without payment to receive the PaymentRequired object.