2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/213300We develop and test a fast and accurate semi-analytical formula for single-name default swaptions in the context of a shifted square root jump diffusion (SSRJD) default intensity model. The model can be calibrated to the CDS term structure and a few default swaptions, to price and hedge other credit derivatives consistently. We show with numerical experiments that the model implies plausible volatility smiles.Accepted for publication in Mathematical FinancePricing of Securitiestext