{"mensaje":"Este endpoint requiere POST con JSON, ej: {\"contrato\":\"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913\",\"evento\":\"Transfer(address indexed from,address indexed to,uint256 value)\",\"red\":\"base\",\"bloques\":20,\"limite\":3}. Precio: $0.005 USDC (Solana o Base)."}