Firma.dev sells envelopes, not seats

The Firma.dev homepage is a dark grid and a price. "Cheapest E-Signature API (Built For Devs)." Then: only €0.049 per envelope, no minimums, no contracts. Super powerful API. Rebrand as your own. Read only that and you bought a cheaper DocuSign.

Open Pricing. Their line, not ours:

That's around 5 cents USD. Billed in your local currency, always. No minimums, no contracts, no per-seat fees.

— firma.dev/pricing

You ship the signing. They sell the envelope.

A listing will say Spain, e-sign, €0.049. It will not tell you what you are actually buying. Firma.dev is not a signing app for the office. It is an API you put inside your own product. Your users never have to see the name. The template editor embeds. The signing flow embeds. White-label covers the emails. Customer Workspaces give each of your clients their own templates, usage, and a scoped key. Data is not supposed to cross those walls.

The bill is credits. Fifty envelopes on their calculator are €2.45. Five thousand are €245. Same rate at either end. No developer tier. No monthly floor. A testing-mode key sends real documents for free; they come back marked as test. You pay when you ship. June's Product Hunt write-up still advertised €0.029. The live price today is €0.049. Quote the page, not the press release.

EuroMakers already files Documenso next to it under the same use case. That one is a German open-source signer you can host, or run as a product. Firma.dev is the other job: you POST an envelope so your SaaS can collect a signature without standing up a vendor for the team. If you wanted a place for people to click Sign this week, you bought the wrong listing.

Paris for the PDF. Delaware for the contract.

The security page is blunter than the directory card.

All customer data is stored exclusively in the European Union. Data never leaves EU data centers. This includes documents, metadata, audit logs, and backups. EU-only residency is the default for all accounts and cannot be changed.

— firma.dev/security

Their own docs name the rooms: AWS Paris, CloudFront in Stockholm. The trust page repeats the pairing. That is residency, not a company. The Terms name the operator as 1600 Holdings LLC. Governing law is Delaware, disputes in Delaware courts. The footer is © 2026 1600 Holdings, then a heart in the EU. The June press dateline is Barcelona. A listing that says Spain is describing the pitch. The contract describes Delaware.

Read the privacy policy before you treat "never leaves the EU" as the whole file. It was last updated 8 June 2025. It still says they may transfer data to the United States or other jurisdictions, under Standard Contractual Clauses. It also lists SOC 2 Type II and ISO 27001 as planned. The homepage shows those badges anyway. The security page is careful in a different place: AWS holds the certifications. Ask which of those sentences your counsel wants in writing.

AdES is the ceiling

eIDAS has three tiers. Firma.dev sells two. Simple (SES) and Advanced (AdES), with a PAdES B-LTA profile on the signed PDF so the signature is supposed to stay checkable for decades. Their eIDAS explainer calls AdES "the strongest standard in common business use" and leaves Qualified off the table they show buyers. That is not a slight. Qualified needs a supervised trust service and a secure device. They do not claim to be that.

Their Germany legality page is the useful one. Since 1 January 2025, the Fourth Bureaucracy Relief Act turned a lot of commercial leases and employment paperwork from written form into text form, which SES and AdES can satisfy. The short list that still needs more is still short: consumer credit, certain sureties, notarised property and company acts. Employment termination in Germany still wants wet ink. France keeps QES for public procurement, notarial deeds, and court filings. If that is your document, this API is the wrong shop.

Who should not buy it

EuroMakers filed Firma.dev under Productivity because that is where e-sign lives in the directory. The pricing page is the buyer's guide they already wrote. Skip it if you need a different job.

• You need a qualified electronic signature, or a notary. They sell SES and AdES.
• You want to host the signer yourself. That is still Documenso.
• You need the vendor on the contract to be an EU company. The Terms are 1600 Holdings LLC, Delaware law.
• You need a formal SLA. They say they do not offer one.
• You want a signing app for the office and no integration. This is an API you embed.
• You budgeted the June figure of €0.029. The live price is €0.049.

If you are embedding signing in a product and you can live with AdES, Paris hosting, and a Delaware counterpart, start with the listing, then read Pricing next to the security page. The homepage will show you a price. The unit is the envelope.

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