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Agents tracked: 444 Releases (7d): 644 Agent status: 3 with issuesSince last limit reset: Claude 31d · Codex 3d Updated Oct 23, 2026
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Email, forms and notifications · by 1600 Holdings LLC

Firma.dev

A pay-per-envelope e-signature REST API with embeddable, white-label template and signing editors, isolated workspaces per customer, webhooks and audit trails, aimed at SaaS apps that want document signing inside their own product.

You add legally recognised signing (ESIGN, UETA, eIDAS) to your app without a per-seat e-signature subscription or sending users to another vendor's site.

API (paid)Free tierCommercial OK

Open firma.dev ↗ agent.md

For your project

Official API
Official API · Paid
“Base URL: `https://api.firma.dev`” firma.dev/llms.txt
Key
Needed
“Authentication: API key via `Authorization` header.” firma.dev/llms.txt
Formats
JSON
Data download
Not stated
Price
Free tier Free testing mode API key with real documents, no limits, no card; live use costs EUR 0.049 per envelope via prepaid credits, no subscription
“Test with real documents for free using the included testing mode API key. No limits, no credit card. Pay when you ship.” firma.dev/llms.txt
License
Firma Terms & Conditions Use of the e-signature API, embeddable editors and signing flows
Commercial use
Commercial use OK
“Customer: A business entity that purchases and uses credits to access the Service.” firma.dev/legal/terms-conditions
Credit
No credit needed
“Apply your own branding to the entire signing experience. Your users never see Firma.dev.” firma.dev/llms.txt
Embedding
Can be embedded
“Embeddable Signing Experience**: Signers complete the signing flow without leaving your interface. Fully white-labeled.” firma.dev/llms.txt
Using the website
Free tier

Read on Firma.dev's own pages on Oct 24, 2026 · license or terms · API docs · pricing. Check the license page before you ship.

For your agent

  • REST at https://api.firma.dev with the API key in the Authorization header (a testing-mode key is free); Data MCP https://mcp.firma.dev/mcp uses OAuth, and the read-only Docs MCP https://docs.firma.dev/mcp needs no auth.
  • Service stops when the prepaid credit balance reaches zero; enable auto top-up for production
  • Unused credits are only refundable within 3 days of a mistaken purchase
  • Firma does not verify signer identity or document legality; the customer is responsible

llms.txt: firma.dev/llms.txt · MCP: https://mcp.firma.dev/mcp

Paste into your agent: Read https://agentgid.com/resources/firma-dev/agent.md before using Firma.dev.

Quick answers

Does Firma.dev have an API?

Yes. Firma.dev has an official API documented at https://docs.firma.dev/.

Does the Firma.dev API need a key?

Yes, you need an API key.

Is Firma.dev free?

Yes, there is a free tier: Free testing mode API key with real documents, no limits, no card; live use costs EUR 0.049 per envelope via prepaid credits, no subscription

Can I use Firma.dev in a commercial project?

Yes. Its terms say: "Customer: A business entity that purchases and uses credits to access the Service."

Can I embed Firma.dev in my site?

Yes.

What you can build

  • Contract signing inside a freelancer or agency SaaS, with one isolated workspace per client company
  • An onboarding flow that sends a filled PDF template for signature and updates the user record from the document.signed webhook
  • A white-labeled signing feature resold as part of a vertical SaaS plan

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