Firma.dev

Firma.dev is a developer-focused e-signature API that lets you integrate legally binding signatures into your app for an average cost of ~3¢ per envelope. It’s built for developers who need a simple, pay-as-you-go alternative to expensive platforms like DocuSign, with a clean REST API and no monthly fees. The project is interesting because it dramatically lowers the barrier to adding e-signatures, making it accessible for startups, SaaS tools, and internal workflows.