Contract Management APIs That Don't Charge Per Envelope
Automate contract signing and approvals with a REST API. Deploy DocuSeal on Opsily for predictable pricing, full data control, and no vendor lock-in.
Trusted by fast-moving teams
Why Contract APIs Should Be Open-Source
Enterprise contract management platforms lock you into proprietary systems. Open-source APIs let you stay in control.
Flat-rate pricing instead of per-envelope fees
DocuSign charges $600+/year and meters every signature. With Opsily-hosted DocuSeal, you pay $20/month for the server and $0.20 per document. At scale, that's 1/10th the cost. You know exactly what you'll spend next month. No surprise overages.
No vendor lock-in
DocuSeal is open-source on GitHub. Export your data anytime. Run it yourself or on Opsily. Switch hosting providers without losing your contract history or API integrations. Enterprise CLM platforms tie you in forever.
REST API that's actually usable
Full feature parity with proprietary APIs. Webhooks for workflow automation, template-based document generation, batch signing, and custom metadata. Everything a developer needs without a vendor's sales team involved.
Built for teams who need reliability
DocuSeal vs. Enterprise Contract APIs
Open-source beats proprietary when it comes to cost and control.
Pricing as of 2026. Enterprise contracts available but require direct sales engagement.
EUR 800 a year for tools that used to cost us multiples of that. We replaced HubSpot, Make.com, and our password manager with self-hosted apps on Opsily. One provider, one fee.
Franz Koller
Co-Founder · Joy
Integrate Contract Signing in 5 Minutes
No complex setup or vendor lock-in. From API key to first signature.
Choose Your App
Select an app to get started.
Get your API key
Sign up for Opsily, choose your plan, and grab your DocuSeal API key from the dashboard.
Upload or create a template
Use a PDF, DOCX, or XLSX as your contract template. Opsily handles versioning and backups.
Call the API to generate documents
POST requests with signer details, field mappings, and callback URLs. Webhooks notify your app when signatures arrive.
Automate your workflow
Integrate with n8n, Zapier, or your own backend. Contracts auto-file, approvals auto-route, emails auto-send.
Start Free, Scale at Your Own Pace
Pick a server, add your contract signing API on top. All plans include GDPR-compliant German hosting, daily backups, and 99.9% uptime.
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Why Contract APIs Matter
Every SaaS team has contracts: customer agreements, vendor NDAs, partner contracts. Most companies email PDFs around, print them, scan them, and lose them in folders.
A contract management API automates this mess. Developers embed signing directly into their app. Contracts flow through webhooks into the CRM. Approvals trigger automation. No emails. No printing. No humans forwarding files.
Enterprise platforms like DocuSign, Onit, and SAP Ariba own this space. They charge $600+/year per company (not per user -- per company). They meter envelopes. They hide costs in licensing tiers.
DocuSeal Changes the Equation
DocuSeal is open-source. 16K developers on GitHub rely on it. It's actively maintained, supports PDF and Office documents, and has a REST API that works. You can run it yourself or let Opsily run it for you.
On Opsily, you pay $20/month for the server. Documents cost $0.20 each. If you sign 100 contracts/month, that's $40 total. On DocuSign, you'd pay $600/year minimum, plus overage fees at scale.
When to Use a Contract API
Use this if you:
- Build a SaaS product that needs customer contract automation
- Run a marketplace with partner agreements
- Manage vendor contracts at scale
- Need GDPR compliance with EU data residency
- Want to avoid per-envelope SaaS licensing
Your customers benefit: they sign once, no email chains, no lost PDFs. Your team benefits: contracts auto-file, approvals auto-route, you never manually track a signature again.
Bank-Grade Security, No Compromises
Your contracts contain sensitive data. Opsily treats security like your compliance team does.
GDPR Compliant
Data stays in German data centers. You own your contract archive. No US data transfer without your consent.
Open Source & Auditable
16K+ developers review the code. Security fixes are public and instant. No black-box vendor promises.
Encrypted at Rest & in Transit
TLS 1.2+, AES-256 encryption for stored documents. Automatic security patches applied within 24 hours.
99.9% Uptime SLA
Daily backups, multi-region redundancy, instant failover. If Opsily goes down, you get service credits.
Compliance Ready
Audit trails for every signature, document version history, automated compliance reports. SOC 2 audits supported.
Contract Management API: Questions Answered
Everything you need to know about choosing and integrating a contract management API.
A contract management API lets developers programmatically create, send, and track contracts within their own application. Unlike standalone document signing tools (like filling out forms manually), an API means contracts flow automatically from your backend into signing workflows without human intervention. DocuSeal's API supports templates, webhook callbacks, batch operations, and custom metadata so you can fully automate contract lifecycle. This is what enterprise platforms like Onit and DocuSign charge $600+/year for. DocuSeal does it at $0.20 per document.
What our customers say
Teams across the EU run their stack on Opsily. Here is what that looks like in practice.
EUR 800 a year for tools that used to cost us multiples of that. We replaced HubSpot, Make.com, and our password manager with self-hosted apps on Opsily. One provider, one fee.
Franz Koller
Co-Founder • Joy
We were paying per user on everything and it added up fast. Now we run five apps for less than one of those old plans. My finance team finally stopped asking questions.
Elise
Head of Operations
Wanted to use n8n for ages but the self-host part always stopped me. Opsily just handled it. Got the power without becoming an IT person overnight.
Federica B.
Automation Consultant
Start Automating Contracts Today
Deploy DocuSeal in minutes. First 2 months are 60% off.