Classify Ethereum wallet by behavior pattern: exchange, MEV bot, whale, smart-money, fresh, contract, sybil, unknown

Classify Ethereum wallet by behavior pattern: exchange, MEV bot, whale, smart-money, fresh, contract, sybil, unknown. Returns primary_tag, confidence (0-1), signals (tx frequency, counterparty patterns, x402 payment history), metrics (nonce, eth_balance, is_contract). Combines onchain RPC analysis with Coinbase Bazaar payer behavior. Use for AI trading agent counterparty assessment, treasury monitoring, on-chain due diligence.