Firma.dev

Ultra-affordable electronic signature API designed specifically for developers and SaaS platforms. At just $0.029 per envelope, it's up to 10x cheaper than traditional e-signature providers with no monthly fees, contracts, or hidden costs.

Key features include:

• Simple REST API integration - Add signing workflows in minutes with just a few lines of code
• White-label embedding - Fully customizable branding that seamlessly integrates with your application
• Multi-team management - Create unlimited teams with complete data isolation for your SaaS customers
• Real-time webhooks and events - Get instant notifications for document status changes and signing progress
• Comprehensive compliance - ESIGN, UETA, eIDAS, and GDPR compliant with audit trails and completion certificates

Developer-first approach with Swagger/OpenAPI documentation, pre-built UI components, sample applications, and framework-agnostic compatibility (JavaScript, React, Vue.js, Angular, mobile apps).

Perfect for SaaS platforms looking to add e-signature capabilities without redirects or external accounts. Start free with 25 envelopes included, then pay only for what you use. No minimums, no contracts - just simple, transparent pricing that scales with your business.