ERC-20 balanceOf for a holder on Base mainnet for $0.001 USDC via eth_call

ERC-20 balanceOf for a holder on Base mainnet for $0.001 USDC via eth_call. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover only the supplied input or one bounded public endpoint at request time; callers must verify before acting.