Cheapest e-signature API
(built for devs)
Only €0.049 per envelope, no minimums, no contracts.
Super powerful API. Rebrand as your own.
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.
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.
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.
Templates
Documents
Teams
Events
GET
Event Stream
Access real-time events for all team activities and document status changes.
Document lifecycle events
Signing progress notifications
Team activity monitoring
Error and system alerts
SEE
List Templates
Server-sent events for real-time notifications in your SaaS application.
Real-time event streaming
Automatic reconnection handling
Filtered event subscriptions
Perfect for live dashboards
POST
Create Team
Create unlimited teams for your SaaS customers with complete isolation.
Complete data isolation per team
Custom branding and white-labeling
Team-specific webhook configurations
Granular permission controls
GET
Team Analytics
Retrieve all templates for a specific team with pagination and filtering.
Document sending statistics
Completion rates and timing
Usage-based cost tracking
Performance insights and trends
POST
Send Document
Send documents for signing from templates or direct uploads.
Use existing templates or upload new PDFs
Add multiple recipients with different roles
Set signing order and deadlines
Include custom metadata and notifications
GET
Document Status
Track signing progress, completion status, and download signed documents.
Real-time status updates
Detailed signing progress
Download completed documents
Access audit trails and certificates
POST
Create Template
Create reusable document templates for your teams with predefined fields and layouts.
Upload PDF documents
Define signature and form fields
Set recipient roles and permissions
Configure team-specific settings
GET
List Templates
Retrieve all templates for a specific team with pagination and filtering.
Paginated results
Filter by creation date
Search by template name
Sort by usage frequency
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.
Events
POST
POST
Create Template
Create reusable document templates for your teams with predefined fields and layouts
POST
Create Template
Create reusable document templates for your teams with predefined fields and layouts
Upload PDF documents
Define signature and form fields
Set recipient roles and permissions
Configure team-specific settings
GET
GET
List Templates
Retrieve all templates for a specific team with pagination and filtering
GET
List Templates
Retrieve all templates for a specific team with pagination and filtering
Paginated results
Filter by creation date
Search by template name
Sort by usage frequency
Documents
POST
POST
Send Document
Send documents for signing from templates or direct uploads
POST
Send Document
Send documents for signing from templates or direct uploads
Use existing templates or upload new PDFs
Add multiple recipients with different roles
Set signing order and deadlines
Include custom metadata and notifications
GET
GET
Document Status
Track signing progress, completion status, and download signed documents
GET
Document Status
Track signing progress, completion status, and download signed documents
Real-time status updates
Detailed signing progress
Download completed documents
Access audit trails and certificates
Teams
POST
POST
Create Team
Create unlimited teams for your SaaS customers with complete isolation
POST
Create Team
Create unlimited teams for your SaaS customers with complete isolation
Complete data isolation per team
Custom branding and white-labeling
Team-specific webhook configurations
Granular permission controls
GET
GET
Team Analytics
Retrieve all templates for a specific team with pagination and filtering
GET
Team Analytics
Retrieve all templates for a specific team with pagination and filtering
Document sending statistics
Completion rates and timing
Usage-based cost tracking
Performance insights and trends
Events
GET
GET
Event Stream
Access real-time events for all team activities and document status changes
GET
Event Stream
Access real-time events for all team activities and document status changes
Document lifecycle events
Signing progress notifications
Team activity monitoring
Error and system alerts
SEE
SEE
List Templates
Server-sent events for real-time notifications in your SaaS application
SEE
List Templates
Server-sent events for real-time notifications in your SaaS application
Real-time event streaming
Automatic reconnection handling
Filtered event subscriptions
Perfect for live dashboards
Webhooks for what you need
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 real-time notifications for every signing event. Perfect for updating your SaaS application state and triggering automated workflows.
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
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
How a Brazilian Legal Tech Startup Dropped Self-Hosted DocuSEAL for Firma.dev's White-Label API
How a Brazilian Legal Tech Startup Dropped Self-Hosted DocuSEAL for Firma.dev's White-Label API
How MoXi® replaced their locked-in LOS tool with Firma.dev, and set it up in two days.
How MoXi® replaced their locked-in LOS tool with Firma.dev, and set it up in two days.
How a Fintech Startup Ditched Google E-Signatures and Went API-First with Firma.dev
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
€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
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.
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.
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.