“Can an API-first payroll infrastructure company become the default embedded payroll layer for vertical SaaS platforms?”
Salsa was founded in 2021 to solve the developer-facing side of payroll — a category dominated by legacy incumbents (ADP, Paychex) and one embedded competitor (Check). The company's thesis is that vertical SaaS platforms want to launch their own branded payroll products, and that requires API infrastructure that handles calculations, tax filings, and money movement. Salsa has positioned itself as a Check alternative with US + Canada coverage in a single API, GraphQL access, and no co-branding.