Electronic Signature API at Just €0.049 for Developers

€0.049 (~5¢) per envelope, and the price is the same whether you send 10 envelopes or 10,000. One envelope is one document sent for signature, however many signers or pages it has. There are no seats, monthly minimums or contracts, and you don't need a sales call to get started. That puts Firma.dev 97-99% below DocuSign on cost per envelope.

Yes. Firma.dev is compliant with the ESIGN Act, UETA, eIDAS (SES and AES) and UK eIDAS, and signatures are legally binding in 55+ countries. Every signing request has a complete audit trail. Each document view, field interaction, signature, decline and admin action is recorded with a timestamp and the actor's identity, and signer events include the signer's IP address. That gives you evidence of who signed what, when, and from where. You can view the trail in the dashboard or pull it through the API.

Only in the EU. Firma.dev runs on AWS in Paris with CloudFront in Stockholm, and customer data never leaves EU data centers. Documents are encrypted at rest with AES-256 and in transit with TLS 1.2 or higher. Firma.dev aligns with GDPR, acts as your data processor, and offers a Data Processing Agreement to every customer.

Yes. Every account includes a free testing-mode API key that works with real documents, as many as you need. No credit card is required.

Hours, not weeks. Firma.dev gives you a REST API, a TypeScript SDK, webhooks for real-time document events, and guides for the most common signing flows.

Yes, and that's the use case Firma.dev was built for. The embeddable template editor, signing request editor and signing experience drop straight into your app, authenticated with JWT. Each of your customers gets their own Customer Workspace with separate templates, documents and API keys. Workspaces are unlimited and cost nothing extra. White labeling and custom domains keep your brand in front of your users.

Only by the envelopes you send. Firma.dev has no per-seat or per-user fees, so adding 50 new clients costs nothing until you send them contracts. Each client can have its own workspace, which keeps their templates and documents apart, and white labeling puts your branding on every signing request.

No. Firma.dev works with AI coding tools like Claude Code, Cursor, Lovable and Bolt.new, so you can describe the signing flow you want and let the tool write the integration. To skip code entirely, connect Firma.dev to Zapier or n8n.

Yes, through two MCP servers. The Data MCP server gives AI assistants direct access to the Firma.dev API through 84 tools. From a plain-language conversation you can manage templates, create and send signing requests, configure workspaces and webhooks, and pull audit trails. It signs in with your Firma.dev account through OAuth. The Docs MCP server gives coding assistants the full documentation and API reference, so the integration code they write uses the correct endpoints, request shapes and auth patterns. Both work with Claude, ChatGPT, Cursor, GitHub Copilot and any other MCP client.

Yes. The price is flat whether you send 10 envelopes or 10,000. No volume tiers, no negotiations, no surprise invoices.