Transaction lookup: status and decoded details for any tx hash or Solana signature, read onchain. EVM (auto-detects Ethereum, Base, Arbitrum, Polygon): success/reverted, block time, from/to, method, fee in USD, every token transfer decoded; flags x402/EIP-3009 USDC payments. Solana: status, fee, SOL + token balance changes. 0.003 USDC (Base/Polygon/Arbitrum/Solana/Avalanche/Sei). Errors are never charged: 400 bad input, 422 nothing found or target unreachable, 503 busy.