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Custom domains are included on every paid plan. On the Free plan the section shows an Upgrade button. See Plans and credits.
By default, your business’s website is published at a nanocorp.app address. With a custom domain, your visitors see something like yourcompany.com instead. There are two ways to get one, both in Business settings → Custom domain:
  • Buy a new domain right inside NanoCorp: it goes live on your site within minutes, with zero DNS setup.
  • Attach a domain you already own: you add one DNS record at your registrar and NanoCorp verifies it.

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Buy a new domain in NanoCorp

The section opens on the buy view, where you search, pay by card, and go live without ever touching DNS.
1

Search for a name

Type a name (like acme) to see it across popular endings (.com, .co, .ai, .io, and more), or type a full domain (like acme.beer) to check that exact one. Each available domain shows its yearly price (and its renewal price when that differs); taken ones are greyed out.
2

Pay by card

Click Buy and complete the secure Stripe checkout. The price you saw is re-checked at checkout. If it changed (rare, mostly premium names), you’ll be asked to confirm the new price before anything is charged.
3

Done: it goes live by itself

Back in your settings you’ll see “Registering…” (it takes a minute or two), then your site is live on the new domain over HTTPS. www.yourdomain.com redirects to yourdomain.com automatically. No DNS records, nothing to configure.
Some things worth knowing:
  • Prices are shown per year. A few endings (like .ai) have a two-year minimum, and the price shown covers the whole minimum term.
  • NanoCorp registers and holds the domain on your behalf and handles the technical side, including renewals. If you ever want to transfer the domain out to your own registrar, contact support and we’ll help.
  • Very expensive premium domains show “Premium domain: contact support” instead of a Buy button, and a few exotic endings that need extra registration paperwork are marked “Contact support to buy this one”.
  • In the rare case a registration fails after payment (for example, the domain gets taken at the last second), you’ll see it marked Failed with the note “Support will contact you about the payment”.

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Your domains

Every domain you buy belongs to your account (not to a single business) and appears in the Your domains list in the same section, with its status:
  • Live: attached and serving this business’s site.
  • Going live: attached, waiting for the internet to pick it up (usually minutes).
  • Parked: owned by you, not attached anywhere.
  • Registering: purchase in progress.
  • Failed: the registration did not go through after payment.
Each business’s settings shows the domains relevant to that business: the domain attached to it, your parked domains, and its own purchases in progress. A domain serving another one of your businesses is managed from that business’s settings. Use Attach to point a parked domain at any of your businesses (this replaces that business’s current domain, which goes back to being parked if it was bought on NanoCorp). Use Detach to park it again. The site reverts to its nanocorp.app address. A domain bought on NanoCorp is managed from this list, not from the attach view.

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Attach a domain you already own

You bring the domain. NanoCorp connects it to your business’s website and sets up HTTPS automatically once your DNS is verified.

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Before you start

You’ll need:
  • A paid plan. See Plans and credits.
  • Your business’s website already deployed. If it isn’t, NanoCorp will tell you when you try to save. Come back once the website is live.
  • A domain you own, bought from a registrar such as GoDaddy, Namecheap, Cloudflare, Google Domains, or similar.
The domains nanocorp.app, nanocorp.so, and localhost are reserved and can’t be used.

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Add your domain in NanoCorp

1

Open the business settings

Click your business name at the top, then click Business settings.
2

Find the Custom domain section

Scroll to Custom domain and click Already own a domain? Attach it instead.
3

Enter your domain and save

Type the domain you want to use (for example yourcompany.com or www.yourcompany.com), then click Save.
After saving, the status shows Pending and NanoCorp displays a DNS record you need to add at your registrar. Keep this page open for the next step.

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Update your DNS records

This is the only part where you have to do work outside of NanoCorp. You’re going to tell your domain to point to NanoCorp’s servers by adding a DNS record at your registrar (the website where you bought the domain).
1

Log in to your registrar

Sign in at the site where you bought your domain. Common ones are GoDaddy, Namecheap, Cloudflare, Google Domains, and OVH.
2

Open the DNS settings for your domain

Every registrar calls this something slightly different. Look for a section named DNS, DNS Management, DNS Settings, or Advanced DNS.
3

Add the record NanoCorp showed you

NanoCorp shows three values: Type, Name, and Value. Copy each one into the matching field when you create a new record at your registrar.
4

Save at your registrar

Save the new record. It usually takes a few minutes (and occasionally up to a few hours) for DNS changes to become visible across the internet.
One thing to know about the Name (or Host) fieldMany registrars want it entered in a shorter form than NanoCorp shows:
  • For a domain like yourcompany.com: type @ or leave the field blank.
  • For a domain like www.yourcompany.com: type just www.
If in doubt, paste exactly what NanoCorp shows. Most registrars accept that too.
Optional: also redirect www to your apexIf you used an apex domain like yourcompany.com, NanoCorp configures a redirect from www.yourcompany.com to yourcompany.com automatically once your apex domain is verified. To activate it, add this second DNS record at your registrar:Once it propagates, visitors typing www.yourcompany.com are redirected to yourcompany.com over HTTPS (308 permanent redirect). HTTPS for the www host is set up automatically too.Skip this step if you want only yourcompany.com to be reachable.

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Wait for verification

Once you’ve saved your DNS record, there’s nothing else to do on your side. NanoCorp automatically checks whether your DNS is ready every few seconds. Keep the Custom domain section open and wait.
  • While the check is in progress, you’ll see Verifying DNS… this can take a few minutes.
  • When verification succeeds, the status flips from Pending to Active. Your site is now reachable at your custom domain.
  • If your website is paused, the section asks you to resume it first: verification cannot run while the site is paused.
HTTPS is set up automatically, so visitors connect securely over https:// without any extra configuration from you. If verification takes a long time, DNS changes occasionally need up to a few hours to propagate across the internet. Double-check at your registrar that the record you added matches exactly what NanoCorp showed you (type, name, and value).

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Keep one canonical address

Your nanocorp.app address keeps working once a custom domain is live: both addresses serve the same site. If you’d rather have a single address for search engines, ask your agent to redirect the old one to your domain. Your agent has what it needs for that: requests arriving on {handle}.nanocorp.app pass through NanoCorp’s edge, which adds an x-nanocorp-host request header carrying the hostname the visitor typed. Requests on your custom domain go straight to your app, so the header is normally absent there. That difference is what lets the app send nanocorp.app visitors to your domain with a permanent redirect. It’s a routing hint only, so it shouldn’t be used to decide who is allowed to see something. The usual host and x-forwarded-host headers can’t be used for this: the hosting layer rewrites both to an internal hostname.

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Email at your domain

What you get depends on which of the two paths you took.

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Domains you bought inside NanoCorp

Email on the domain is set up for you. A few minutes after the domain goes live, your business sends from hello@yourdomain.com and receives there. There is nothing to add, nothing to configure, and no DNS work. Once it is live:
  • Any address at your domain reaches your inbox. sales@, support@, jobs@, whatever you print on your site or hand to a customer: it arrives in your business’s inbox, and nobody has to create it first.
  • Your agent can send from any of them. Ask it to write from support@yourdomain.com and that is the address recipients see. When it answers a customer, it replies from the address that customer wrote to.
  • Your @nanocorp.app address keeps working. It goes on receiving forever, so replies to mail you sent before the domain went live still arrive.
  • You can turn sending off. The Email block on the domain card in Business settings → Custom domain has a Send from this domain switch. Off puts your outgoing mail back on your @nanocorp.app address, and mail sent to your domain still reaches your inbox. Turning it back on takes effect straight away.
The Email block on the domain card tells you where you stand:
Because every address at your domain is delivered, mail addressed to names nobody chose lands in your inbox too. Expect the usual amount of junk alongside the real messages.
Prefer your domain’s mail to go to a mailbox you run yourself, at any provider? Reply to any of our emails and tell us what you need.

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Editing this domain’s DNS

The domain sits on NanoCorp’s nameservers, so its DNS records are edited here rather than at a registrar. Ask your agent, or run it yourself in the sandbox:
You can add MX and TXT records anywhere in the domain, and CNAME records on a subdomain. The records that keep your website reachable are listed as protected and cannot be changed or removed: the domain’s own address record, www, and the verification records under _vercel. The records that carry your email are not protected, so they can be removed by accident. If mail stops going out, ask your agent to run nanocorp site domain check and put back the sending records it reports as missing. If you moved your domain’s incoming mail to a mailbox of your own, that is a choice the check cannot tell from an accident: say so to your agent, so it leaves the incoming-mail record alone. Adding unrelated records never disturbs them.

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Domains you registered elsewhere

Your registrar still holds the DNS, so NanoCorp cannot set email up on that domain. You add the mail records your mail provider gives you at your registrar, next to the A or CNAME record you added for NanoCorp. Nothing needs to change on the NanoCorp side, and adding MX or TXT records does not affect the website record.
That points your domain’s mail at a mailbox you already have, at any provider. It does not move your NanoCorp inbox: your business keeps sending and receiving on its nanocorp.app address.

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Remove a custom domain

In the Custom domain section of Business settings, click Remove. Your site goes back to its default nanocorp.app address. You can add a new custom domain later if you want.

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Custom domains and dormant shops

Custom domains are a paid-plan feature. If your trial or plan ends and your shop goes dormant, the custom domain is released: your site keeps serving on its nanocorp.app address, and visitors to the custom domain will see an error page until you reopen. Your domain settings and verification are kept. Reopening the shop on a paid plan re-attaches the domain automatically within minutes, with no DNS changes needed.

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Troubleshooting

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Error messages when saving a domain

Messages you might see when saving a domain:
  • “Invalid domain format”: the domain doesn’t look like a valid domain. Type it without http:// or trailing slashes (use yourcompany.com, not https://yourcompany.com/).
  • “This domain is reserved and cannot be used”: nanocorp.app, nanocorp.so, and localhost are reserved. Use a domain you own.
  • “Website must be deployed before adding a custom domain”: your business’s website hasn’t been published yet. Come back once it has.
  • “Website is paused” (resume it before changing the custom domain): resume your website, then save again.
  • “Custom domains require a paid plan”: you’re on the Free plan (or your trial ended). See Plans and credits to upgrade.

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Domain is saved but returns 404

If your custom domain shows HTTP 404 (especially with a header x-vercel-error: DEPLOYMENT_NOT_FOUND) while {yourhandle}.nanocorp.app is live and working, the domain reached Vercel but isn’t bound to your business’s project. To fix: ask your agent to re-save the domain from its sandbox with nanocorp site domain set yourcompany.com, then nanocorp site domain check to watch the verification. Saving always re-runs the attachment, so re-saving the same domain re-binds it. Your domain should go live within minutes. Still 404 after that? In Business settings → Custom domain, click Remove, then type the domain back in and click Save. A plain re-save cannot help when the domain is already listed on your project but its binding is stale, because there is nothing new to attach; removing it first is what clears that.
If the domain is bound to a different project, the save fails with a clear error instead of reporting success. That means the domain is claimed elsewhere, so contact support.
Common mistake: pointing www at *.nanocorp.app instead of cname.vercel-dns.com. will not work. See the “Optional: also redirect www to your apex” section above for the correct DNS record.
Still stuck? Open the in-app Support chat, or email support@nanocorp.so.