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One identity. Verified everywhere. Authenticate users and collect legally binding signatures without building your own identity stack.

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Get started in minutes

Everything you need to integrate biometric authentication and legally binding signatures.

Getting Started

Set up your first authentication flow in under 5 minutes

API Reference

Complete API documentation with request/response examples

What is UIP?

Learn how UIP works and why it’s better than passwords

View Pricing

Simple, usage-based pricing with no subscriptions

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Three powerful APIs

Modular APIs that work together. Pick what you need.

Identify API

Authenticate users with biometrics and get verified identity data$0.01 per identification

Sign API

Request legally binding biometric signatures$0.03 per signature

Message API

Send encrypted messages to users$0.03 per message

Audit API

Retrieve permanent, court-admissible audit trails for all actionsAlways free

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How it works

A simple flow for every integration: create a session, display a QR code, poll for completion, and receive verified data.
1

Create a session

Call the API with your intent. You get back a session_id, qr_code, and expires_at.
2

Display QR code or deep link

Desktop users see a QR code to scan. Mobile users get an “Open UIP” button that deep links into the app.
3

User authenticates biometrically

The user opens the UIP app, reviews the request, and approves with their fingerprint or face.
4

Poll and get the result

Poll GET /v1/identify/:id until the status is completed. The response includes all verified data — no separate code exchange needed.

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Why UIP?

Built for the modern web. From passwordless authentication to legally binding signatures.
Mobile-only authentication with fingerprint or face recognition. No passwords to manage or reset, no phishable secrets on the server.
Identity verification via official documents and biometric checks. Legally binding signatures with permanent audit trails and court-admissible evidence.
Works across borders, governments, and businesses. One identity for authentication and signing, worldwide. GDPR compliant.
Composable APIs that work together. Pick what you need: authentication, signing, messaging, or audit lookups. Usage-based pricing, no subscriptions.

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Key features

Everything you need for secure identity and signatures.

Biometric security

Local device biometric authentication with liveness detection

AES-256 encryption

Every PII field is encrypted at rest with AES-256-GCM

Fast response times

Session creation and polling respond in well under a second

Permanent audit trail

Every action generates an immutable, verifiable record

QR code flow

Simple scan-and-approve UX that users love

REST + webhooks

Plain HTTPS, JSON, and HMAC-signed webhook callbacks

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Start building today

Get your API keys

Get $20 in credits on your first business. No credit card required.