Please do not breed your precious boy. Cryptorchid is a genetic defect, your guy needs to be neutered to prevent cancer.
Why should my cryptorchid pet be neutered? This is a well-documented genetic trait -- animals with this condition should not be bred. Animals that are cryptorchid may still be fertile, especially if unilaterally (one-sided) cryptorchid. In addition to the heritability aspect, the testicle (or testicles) that remain in the abdomen are more prone to cancer or torsion (twisting and cutting off blood supply).