{"mensaje":"Este endpoint requiere POST con JSON, ej: {\"message\":\"login vextorium\",\"signature\":\"02b62909e98cff56a94a6d2ec3eab2260400594ae53fd8e203aeb4c3e584ec927fa1682cf4bb2f70e3fe17ec0cd4f156a91a1d6217e94ecaad4a01e709819e07\",\"public_key\":\"CGoFePajwf11M2VpQjp17p1bLGZ5BrTM2yFJxnFHZTDe\"}. Precio: $0.003 USDC (Solana o Base)."}