Read-only multi-chain EVM state checks for agent workflows: batch native and ERC-20 balances, allowances, contract code, block heights, and bounded eth_call across Ethereum, Base, Arbitrum, Optimism, and Polygon. Fixed Base USDC batch tiers: $0.05 up to 25 checks, $0.10 up to 50, and $0.15 up to 100. Returns one result per requested check with per-chain snapshot blocks. Provider-reported RPC responses, not cryptographic proofs.