U.ONLine · technology company

We bring U online.

Your name on the internet, your digital identity, and the infrastructure underneath it — the technology that puts people and businesses online, and keeps them there.

From $2, one-time No renewals, ever Self-custodial Built for business
Own it
One-time payment, no renewals
Your keys
Self-custodial by default
Open tech
Built on open internet standards
Business-first
Priced for companies, not hobbies
Names & Domains

It starts with a name

Every presence online begins with the name it lives at. We build and sell the naming layer — web3, namespace, and classic.

.U web3 domains

Your name on the new internet — from $2, one-time. No renewal fees, ever. Yours outright, self-custodial, works as your wallet and your ID.

Get yours →

The .onl namespace

Short, memorable names on the .onl extension — premium online real estate for products and businesses.

ai.onlpay.onlstore.onlmail.onl

Classic domains

Every classic TLD — .com, .net, .io and 1,500+ more — at wholesale pricing through our registrar arm.

unregistrar.com →
Digital Identity

One name, your whole identity

A .U name isn't just an address — it's a Universal ID. Wallet, login, and business identifier in a single name you own.

Your wallet's name

Consolidate every wallet address into one easy-to-remember name. Clients pay your name, not a hex string.

Your login everywhere

One identity across websites, apps, and services — no new passwords, no platform lock-in.

Your business address

Use your name as a universal business identifier — for payments, communication, and presence.

Web Infrastructure

The plumbing behind your presence

A name is the start. Websites, hosting, email, and resolution tech keep you actually online — reliably, at wholesale.

Websites & hosting

Fast, modern web hosting for sites and applications — with the email and tooling a real business needs.

See hosting →

Business email

Professional email on your own domain — your name at your name, not at a free provider.

See email →

Name resolution tech

The technology that turns human names into machine addresses — web3 and classic, resolved to whatever they should reach.

DNS.U.onl
The family

Part of something bigger.

u.onl is part of the U.CASH network. When your business is online and you need the money side — payments and financial tech — that's what u.cash does.

u.onlonline tech
u.cashpayments tech
Contact

Let's get you online.

A domain, an identity, a site, or the whole stack — tell us what you're building and we'll help you put it online.

Prefer email? Write to info@u.onl

FAQ

Questions, answered

What is u.onl?
u.onl (U.ONLine) is a technology company bringing people and businesses online. We cover the whole journey: names and domains, digital identity, and the web infrastructure — websites, hosting, and email — underneath.
What is a .U domain?
A .U domain is a web3 domain — your name on the new internet. It starts at $2 as a one-time payment with no renewal fees, ever. It's self-custodial and works as your wallet name, your digital ID, and your login across services. See u.onl/u.
Do I need crypto to get started?
No. Classic domains, hosting, and email work exactly as you'd expect — no wallet required. .U domains live on a blockchain, but claiming one is a simple checkout, and it's yours outright afterward.
What's the relationship to u.cash?
u.onl is part of the U.CASH network. We handle the online-presence side — names, identity, infrastructure. u.cash handles the money side: payments and financial technology.
How do we work together?
Use the contact form or email info@u.onl. Tell us what you're putting online — a name, a brand, a business — and we'll take it from there.