Firma.dev Cheap E-signatures API

Firma.dev is an e-signature API for developers and businesses who need legally binding signatures without the overhead. Pay-as-you-go at €0.049 per envelope, no monthly minimums or per-seat fees, with support for 55+ countries.

View on firma.dev

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.

What makes Firma.dev different from other e-signature providers?

Built for SaaS, we cut out the bloat and contracts. You get simple API integration and compliance for just €0.049 per envelope-up to 10x cheaper than traditional providers.

How easy is it to integrate Firma.dev into my app?

Extremely easy. With our developer-first REST API and clear documentation, most teams integrate in under an hour. You can start testing for free immediately.

Is Firma.dev secure and compliant?

Yes. We use bank-grade encryption and are fully ESIGN, UETA, and GDPR compliant. Your data is encrypted in transit and at rest, ensuring full legal enforceability.

Do I need to sign a contract or commit to a monthly plan?

No contracts, ever. Firma is strictly pay-as-you-go. You only pay for the envelopes you send, with zero monthly minimums or hidden fees.

OK, I’m in. How do I start?

Simple. Create your account here, and we'll generate your API key.

Navigation