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Welcome to Nitro Sign Enterprise Verified

Nitro Sign Enterprise Verified (NSEV) is Nitro’s product for qualified, high-trust digital signing - supporting a range of signing methods, including digital certificates and ID verification, to meet strict regulatory requirements like eIDAS (AES/QES) and ZertES. It exposes the NSEV WebPortal API (currently API version 4) for building secure document-signing workflows: create a package, upload documents, add stakeholders and signing elements, then track the package through to completion. If the package model is new to you, start with The package model. NSEV is hosted by Nitro, with each customer served from their own tenant - so your API base URL is tenant-specific. The product has its own API surface, authentication scheme, and nomenclature - separate from the Nitro platform APIs documented under Nitro APIs. This documentation describes the latest NSEV release (currently v8.4). Because releases roll out to tenant deployments gradually, features introduced in a newer release are marked Available as of NSEV vX.Y - see the changelog for what changed in each release and for how to check which version your tenant runs.

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Get started

Platform access

Get your credentials and find your tenant’s base URL.

Make your first call

Verify your setup with an authenticated test request.

Send for signing

Walk through sending a document for signature end to end.

Best practices

Authentication, error handling, limits, pagination, and security.

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Base URL

The API base path is always esig/webportalapi/v4. Your host is tenant-specific - each NSEV customer has a unique URL:
Your delivery team will confirm the exact host for your environment. See Platform Access for details.

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Authentication

The NSEV WebPortal API supports two authentication methods - HTTP Basic Auth and OAuth 2.0 Bearer tokens - depending on how your organization has configured the platform. See Credentials & Authentication for the details of each method and when to use which.