Serine protease inhibitor which exhibits antifibrinolytic, antielastolytic and antimicrobial activities (By similarity). Displays antimicrobial activity against bacteria and fungi (By similarity). Likely functions in the innate immune response to microbial infection and possibly in the venom, as an antifibrinolytic agent (By similarity). Induces hyperalgesia and edema mediated by leukotrienes when injected into mice (PubMed:25017240). Does not induce hemolytic activity, mast cell degranulation, or chemotactic activity for polymorphonucleated leukocytes (PMNL) (PubMed:25017240). Expressed by the venom gland. Belongs to the secapin family.