E-signature API at €0.029 per envelope. No subscriptions, no minimums - DocuSign charges roughly 100x that. Firma is a developer-first signing API: a few lines of REST code, fully white-labeled, SOC 2 + ISO 27001 + eIDAS certified out of the box. Works natively with Cursor, Bolt, Replit, and Supabase. If you're building a B2B product that needs contracts, this is the easiest decision in your stack.

https://firma.dev/