{"mensaje":"Este endpoint requiere POST con JSON, ej: {\"message\":\"Hello Vextorium\",\"signature\":\"0x2126c8e3a0da46b0d8cba8ce3d0210337bb23032b681244c026ad68cd41c764325c24b8ca2e1162a4c31969808b17ded11db7ec35d49ea63b7cc6f6d95e276c91c\",\"address\":\"0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf\"}. Precio: $0.003 USDC (Solana o Base)."}