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Non-AI Developer Tools — Other

Firma

E-signature API for developers — embed document signing in your app for €0.049 per envelope, with white-label branding.

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firma.dev
Verified API available Works with n8n
What is it E-signature API for developers — embed document signing in your app for €0.049 per envelope, with white-label branding.
Pricing Paid — from €100/mo
Free tier Yes
Platform API
API Yes
Works with n8n
Best for embedding e-signatures inside a SaaS product, reselling e-signatures under your own brand
Domain registered 2025

Data updated Oct. 3, 2026

What does Firma do?

Firma is an e-signature API built for developers who want to add document signing to their own software. Instead of sending users to a separate signing service, you embed the whole workflow into your app. The starting price is €0.049 per envelope, with no monthly fees, no minimums, and no contracts. You buy credits and use them as needed.

The product is designed to be developer-first. A simple REST API lets you create templates, send documents, manage teams, and track signing status. You also get webhooks for real-time events, an OpenAPI/Swagger spec, pre-built UI components, and an iFrame-based signing form that you can style with URL parameters. Firma supports unlimited teams with full data isolation, so SaaS platforms can give each customer their own signing environment. It is also fully white-label: your branding stays in front, and users never need to create an account with Firma.

Firma is regulated and security-conscious. It supports ESIGN, UETA, and eIDAS compliance, and follows SOC 2, GDPR, ISO 27001, and EU data residency standards. Audit trails and certificates of completion come with each signed document. The main audience is SaaS companies and developers who want to offer e-signatures as a native feature or even resell them as a revenue stream. If you need a simple, low-cost way to embed legal document signing without reinventing the workflow, Firma gives you the building blocks.

Non-AI Developer Tools — Other

Key features

What makes it stand out
01
Add e-signature workflows with a few lines of REST API code in any programming language
02
Pay per envelope at €0.049 with no minimums, subscriptions, or hidden fees
03
White-label the signing experience with your own branding and UX so users never leave your platform
04
Comply with ESIGN, UETA, eIDAS, GDPR, SOC 2, and ISO 27001, with audit trails and completion certificates
05
Get real-time webhooks and event streams for document status changes, team activity, and signing progress

Who is Firma for?

Who benefits most from this tool
embedding e-signatures inside a SaaS product
reselling e-signatures under your own brand
automating document approval workflows with webhooks

Pricing

Free tier available — start without a credit card

Firma

Custom
  • 0.049 per envelope rate
  • Full API access from day one
  • Unlimited teams included
  • Embedded editors
  • Webhooks
  • Compliance built in
  • Unlimited testing with real documents

Priority Support

€100/month
  • Guaranteed 1 business day response times via email

Trust & presence

Domain Domain registered 2025

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