Firma.dev Cheap E-signatures API

Firma.dev est une API de signature électronique destinée aux développeurs et aux entreprises qui ont besoin de signatures juridiquement contraignantes sans frais supplémentaires. Paiement à l'utilisation à 0,049 € par enveloppe, sans minimum mensuel ni frais par utilisateur, avec prise en charge de plus de 55 pays.

Voir sur firma.devEssayer ce MCPSponsorisé

Documentation

EN

Login

Signup

Cheapest e-signature API (built for devs)

Only €0.049 per envelope, no minimums, no contracts.
Super powerful API. Rebrand as your own.

Get your API key now

View API Docs

SOC 2

GDPR

Data residency

ISO 27001

eIDAS

4.9-star rating on g2.com

4.9-star rating on Trustpilot

Works perfectly with:

Benefits

Why Developers Choose Firma.dev

Embed document signing directly into your application. Give users turnkey e-signature capabilities without redirects, extra accounts, or leaving your platform.

Effortless Integration

Add signing workflows in minutes, just a few lines of code. Simple REST API for any programming language.

Ultra-Low Pricing

Only a few cents per envelope. The entire service with no subscription fees, no hidden costs - buy credits only as you need them.

Fully White-Labeled

Embed e-signatures seamlessly with your own branding and UX.

Regulated & Secure

ESIGN, UETA & eIDAS compliant, with audit trails and certificates of completion.

Resell-ready

Built to be rebranded and bundled. Turn e-signatures into a revenue stream with easy team management.

Developer-first Toolkit

Swagger/OpenAPI docs, pre-built UI components, webhook events, and sample apps.

Complete REST API for SaaS Platforms

Built specifically for SaaS companies to embed e-signatures seamlessly. Manage unlimited teams, white-label the experience, and scale effortlessly.

  1. Templates

  2. Documents

  3. Teams

  4. Events

  5. GET

  6. Event Stream

Access real-time events for all team activities and document status changes.Document lifecycle eventsSigning progress notificationsTeam activity monitoringError and system alerts

  1. SEE

  2. List Templates

Server-sent events for real-time notifications in your SaaS application.Real-time event streamingAutomatic reconnection handlingFiltered event subscriptionsPerfect for live dashboards

  1. POST

  2. Create Team

Create unlimited teams for your SaaS customers with complete isolation.Complete data isolation per teamCustom branding and white-labelingTeam-specific webhook configurationsGranular permission controls

  1. GET

  2. Team Analytics

Retrieve all templates for a specific team with pagination and filtering.Document sending statisticsCompletion rates and timingUsage-based cost trackingPerformance insights and trends

  1. POST### Send Document

  2. Send documents for signing from templates or direct uploads.Use existing templates or upload new PDFsAdd multiple recipients with different rolesSet signing order and deadlinesInclude custom metadata and notifications

  3. GET### Document Status

  4. Track signing progress, completion status, and download signed documents.Real-time status updatesDetailed signing progressDownload completed documentsAccess audit trails and certificates

  5. POST

  6. Create Template

Create reusable document templates for your teams with predefined fields and layouts.Upload PDF documentsDefine signature and form fieldsSet recipient roles and permissionsConfigure team-specific settings

  1. GET

  2. List Templates

Retrieve all templates for a specific team with pagination and filtering.Paginated resultsFilter by creation dateSearch by template nameSort by usage frequency

Webhooks for what you need

Get real-time notifications for every signing event. Perfect for updating your SaaS application state and triggering automated workflows.

Get your API key now

White-Label Embedding for SaaS

Enhance your platform with a fully integrated, hassle-free document signing solution that allows users to create, manage, send, and sign documents directly within your application.

Simple Integration

Add a signing form in just a few lines of code

  • Drop-in iFrame solution
  • Responsive design for all devices
  • Custom styling with URL parameters
  • White-label branding automatically applied

Form Builder

Use embedded form builder to create documents

  • Drag-and-drop document creation
  • Pre-built form templates
  • Custom field types and validation
  • Real-time document preview

Universal Compatibility with Multiple Frameworks

Works with JS, React, Vue.js, Angular and mobile apps

  • Framework agnostic integration
  • Native mobile app support
  • Progressive web app compatible
  • Cross-browser compatibility

Try Firma.dev

See what a Firma-signed document looks like

Get a real sample document sent to your inbox You’ll receive a Firma.dev signing request. Sign it, download it, and see the completion certificate included with every signed document.

We’ll never sell your info or spam you.

What Developers says

I'm a geek. I don't have to speak to anyone. I can just get started now.

Rasmus Rowbotham, Founder, FoundBase

Time to integrate, A single evening, Sales calls, Zero, Team Size, 3, bootstrapped

Read the full case study

May 29, 2026 How a Brazilian Legal Tech Startup Dropped Self-Hosted DocuSEAL for Firma.dev's White-Label API

Apr 29, 2026 How MoXi® replaced their locked-in LOS tool with Firma.dev, and set it up in two days.

Apr 29, 2026 How a Fintech Startup Ditched Google E-Signatures and Went API-First with Firma.dev

See All Real results from real developer.

Pricing

The most affordable e-signature API

Just €0.049 per envelope. No monthly fees, no contracts, no surprises.

€0.049

per envelope

Start for free. Pay only when you send documents for signing.
See pricing comparison

  • Unlimited teams included
  • Full API access from day one
  • Support directly from engineers

Get your API key now

FAQ

Frequently asked questions

For any unanswered questions, reach out to our support team via email. We'll respond as soon as possible to assist you.

How much does Firma.dev cost?

€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. See pricing or compare Firma.dev and DocuSign.

Are signatures from Firma.dev legally binding?

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. Check the rules in your country or see how the audit trail works.

Where is my data stored?

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. Read about security.

Can I try Firma.dev before paying?

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. Get your API key now.

How long does integration take?

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. Read the docs or explore the API.

Can I embed e-signatures in my own product?

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. See Customer Workspaces and white-label e-signatures.

Does the cost go up as I add more clients?

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. See how workspaces work.

Do I need a developer to use Firma.dev?

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. Browse all integrations.

Does Firma.dev work with AI agents?

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. Set up the MCP servers.

Navigation