Secured Signing Digital Signature APIs

Seamlessly integrate legally binding, PKI-based digital signatures into your software, web applications, or business workflows.

Secured Signing’s Digital Signature APIs page header

From simple document signing to complex enterprise automation, our APIs do the heavy lifting so you can focus on your core business.

The Invisible Engine for Your Workflow.

Secured Signing REST-based, JSON API bridges the gap between your application and a world-class signing engine. By automating the entire lifecycle—from data handover to final execution—we eliminate manual overhead.

  • Sync: Seamlessly pass documents and metadata.

  • Automate: We manage the signature sequence and security.

  • Return: Signed files and audit trails flow back to your database instantly.

Our Standard API
  • REST – based API
  • API Key / OAuth2 Authentication
  • Pay per document signing process
  • JSON Request/Response Format
  • Client SDK (.Net/C#) Available
  • Web hook callback

Partner API: Enterprise Administration

Designed for large organizations and software partners who need to manage multiple entities.

  • Centralized Control: Sync with your existing org structure. Ideal for everything from boutique firms to global enterprises.

  • Deep Integration: Full control over users, companies, and document permissions.

OEM API: A Fully White-Labeled Experience

Build a premium, cohesive brand experience by embedding our signing engine directly into your UI.

  • Invisible Branding: No Secured Signing logos or mentions—it looks and feels like your software.

  • Unified Billing: allows you to group all document actions and user costs across your entire client base into a single account.

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More Than a Signature. A Complete Process

Take your automation a step further. Leverage our API’s Smart Tag engine to transform static documents into dynamic, multi-stage workflows tailored to your business needs.

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Automation with Secured Signing Smart Tags

Turn static templates into dynamic workflows. Automate recipient routing, ID checks, video confirmations, and file attachments—all with a single tag.

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Let Our API Handle the Heavy Lifting.

Once built and integrated via the API our system will take care of each step of the process, in order with updates on status of each workflow running sent back as needed.

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Our Simple Pay Per Document Signing Model

To keep things simple we offer a low monthly fee then a per document and per user charge. For standard plans look at our pricing page or share with us your documents volume and number of users just click request a quote

Simple, All-Inclusive Pricing

No “API Tax.” No Hidden Call Costs.

Secured Signing API access is bundled directly into your plan.

  • API Calls Included: We don’t meter your API calls or charge you for “per-call” pings. Integrate as deeply as you need without watching the clock.
  • Transparent Document Model: You only pay for the documents you process. Whether you send a document via our web portal or via your custom API integration, the cost is the same.
  • Scale Without Surprise Fees: As your volume grows, your per-document cost decreases. Our predictable pricing allows you to scale your application with total budget certainty.

Developer Note: Every plan includes access to our Sandbox environment, full API documentation, and technical support to ensure your integration is a success.

Remote Online Notarization (RON) via API

Bring the Notary Office to Your Application. Go beyond simple signatures by integrating our Remote Online Notarization (RON) capabilities. Our API allows you to automate the scheduling and execution of notarized sessions directly within your platform.

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  • Identity Proofing (KBA & IDV): Built-in automated credential analysis and Knowledge-Based Authentication.

  • Live Video Integration: Secure, recorded audio-visual sessions that meet stringent state and international compliance standards.

  • Electronic Notary Journal: Automatically capture and store all required notary logs and session recordings via API.

  • Seamless Legal Compliance: Provide a secure, tamper-evident digital seal and X.509 digital signature for every notarized document.

Enterprise-Grade Power. Developer-First Design.

Trusted to handle millions of document actions every month, Secured Signing combines enterprise reliability with developer simplicity. We manage the complex compliance landscape – giving you enterprise-grade reliability right out of the box.

SOC 2 TYPE 2026

SOC2 Type II

System and Organization Controls

SOC 2 Type I

System and Organization Controls

HIPPA COMPLIANT with Secured Signing 2

HIPAA Compliant

HIPAA Compliant digital signing platform.

Secured Signing Mismo Compliant

MISMO Compliant

Certified MISMO Compliant digital signing platform.

ISO Certified Security with Secured Signing 2

ISO 27001 Certification

Efficiently and securely generated digital signing platform.

AOG Complaint Digital Signatures

AOG Marketplace

Listed on the All of Government Marketplace.

EU Complaint

GDPR Compliant

GDPR Compliant digital signing platform.

FAA compliant digital signatures

FAA Compliant

Federal Aviation Administration complaint digital signing platform.

FDA Compliant

FDA 21 CFR Part 11

Speak To Our Team

To speak to our team about our API plans, get a written quote and get assistance with implementation, fill out the form below and we will get back to your shortly.