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The Best Buy-a-Domain API for SaaS in 2026

Jonathan Geiger·
custom domainscomparisonbuy domain apisaas

If your SaaS lets users have their own branded URL (a portfolio, a storefront, a landing page, a hosted chatbot, anything with a custom subdomain), there's an inevitable next conversation with your customers: "can I just buy the domain inside your app?"

In 2026 you can finally say yes without a four-week build.

This post compares what's actually available, why most existing options are wrong for modern SaaS, and what to look for when picking a Buy-a-Domain API for your product.

The landscape

Most domain reseller APIs were built for a different era. They target hosting resellers running WHMCS and selling shared cPanel hosting to small businesses. The DX reflects that: XML-over-GET, IP whitelisting that breaks at autoscale, contracts and minimums, partner portals.

The big names in that bucket: OpenSRS (Tucows), NameSilo, NiceNIC, Dynadot, Domain Name API. They all work. They all assume you're a one-person reseller running a single billing account, not a SaaS letting your end-users self-serve.

What modern SaaS actually needs is a different shape:

  • A REST API that looks like Stripe, not 2008
  • The end-user as legal owner (not your company)
  • Per-end-user filtering so you don't run a parallel database
  • Pricing transparent enough to surface to your own users in real time
  • White-label by default. Your end-user never hears the upstream registrar's name.

Domainee was built for that gap.

How Domainee is different

The pitch is simple. Domainee holds a Namecheap reseller account so you don't have to. You call our REST API, we register the domain, your end-user is the legal owner of record, and Domainee never appears in the UX.

Wholesale + $1 per registration. Flat fee, not percentage. A .com costs you about $10 total, a .io is about $31, a .ai is about $81. You charge your end-user whatever you want on top.

For SaaS specifically, three things matter.

Domains are tagged to your end-users

Every purchase carries a customerReference you set at buy time. It's your internal user id, order id, whatever. Later, querying "all of Jane's domains" is one filtered GET, not a join table you have to maintain.

One call buys AND connects

Pass autoConnect: { originUrl } and we register the domain, provision it on our edge with automatic TLS, and set the DNS at the registrar. Your end-user clicks once, the domain serves your app within minutes.

Full white-label management

Eight endpoints to manage every part of the post-purchase lifecycle. DNS records, nameservers, renewal, transfer-out. Your users never log into Namecheap because they don't have a Namecheap account. You build the dashboard, Domainee handles the registrar plumbing.

Who is this for

We've been asked this enough that here's the actual list.

If your product gives users a hosted thing at a URL, and any of these sound familiar, you're a candidate:

  • Website builders (the obvious one)
  • Newsletter platforms wanting news.acme.com
  • Link-in-bio tools wanting links.creator.com
  • AI app builders shipping per-user mini-apps at custom domains
  • Course platforms with branded learning portals
  • Booking and scheduling apps wanting book.dentist.com
  • No-code tool platforms where users publish at their own URL
  • White-label CRMs, helpdesks, support portals
  • Internal IT portals at branded subdomains
  • Landing page tools, form tools, quiz tools, anything publishable

If your users already say "can I use my own domain?" once a week, adding "buy one through us" is a small step that meaningfully changes activation.

A 60-second integration

The whole thing is two calls. Quote then buy.

# 1) Quote the price (no charge)
curl https://api.domainee.dev/v1/domain-purchases/check \
    --get --data-urlencode 'hostname=janesbakery.com' \
    -H "Authorization: Bearer $DOMAINEE_API_KEY"

{
  "available": true,
  "pricing": {
    "wholesaleCents": 1418,
    "feeCents": 100,
    "totalCents": 1518,
    "currency": "USD"
  }
}

You take totalCents, add whatever markup makes sense for your audience, charge your user.

# 2) Buy + auto-connect to your app in one call
curl -X POST https://api.domainee.dev/v1/domain-purchases \
    -H "Authorization: Bearer $DOMAINEE_API_KEY" \
    -d '{
      "hostname": "janesbakery.com",
      "registrant": {
        "firstName": "Jane",
        "lastName":  "Smith",
        "email":     "jane@bakery.example",
        "phone":     "+1.5551234567",
        "address1":  "123 Main St",
        "city":      "Portland",
        "stateOrProvince": "OR",
        "postalCode": "97201",
        "country":   "US"
      },
      "customerReference": "user_jane_42",
      "autoConnect": {
        "originUrl": "https://janesbakery.acmesites.app"
      }
    }'

That's it. We charge your saved Stripe card, register the domain with Jane as legal owner, provision the domain on our edge with TLS, set DNS at the registrar to CNAME to us. One transaction. Refunded automatically if any step fails.

A few hours later, when Jane wants to add an MX record for email or check her domain's expiry, you query the management API:

# List all of Jane's domains
curl "https://api.domainee.dev/v1/domain-purchases?customerReference=user_jane_42" \
    -H "Authorization: Bearer $DOMAINEE_API_KEY"

# Read her DNS records
curl https://api.domainee.dev/v1/domain-purchases/$ID/dns \
    -H "Authorization: Bearer $DOMAINEE_API_KEY"

Full reference at /docs/api/domain-purchases.

The custom-domains API, while we're at it

Domains people buy from you are one half of the story. The other half is users who already own a domain and want to point it at your app. Domainee's other API (/docs/api/domains) handles that path too. Same flat pricing model, same white-label, same end-user-owns-the-record posture. One product, two ways in: buy through us, or bring an existing domain.

A lot of SaaS ship the "bring your own" path first, see the support load from DNS confusion, and add the buy path second. Both live behind the same Domainee API key and the same management surface.

What we don't do

We're not the right call if you want a partner portal, IP-restricted WHMCS plugin, or a bulk-import-10K-domains-from-spreadsheet workflow. Those use cases are well-served by NameSilo and OpenSRS.

We're not the right call if you want to be a domain registrar yourself, with your own ICANN accreditation, your own pricing tiers, and your own underlying registrar account. That's a different product. Talk to Tucows.

We're the right call if your end-user shouldn't know what a Namecheap is and you want a REST API that gets out of your way.

Pricing recap

  • Wholesale + $1 flat per registration. No monthly minimum, no per-seat fee.
  • The $1 fee covers refund risk and FX. Not percentage based, so a $9 .com stays cheap and a $200 .ai doesn't suddenly cost you $40 in margin.
  • Renewals work the same: wholesale + $1, charged once per renewal.
  • DNS, nameservers, management API access: zero added cost.
  • If your end-user wants to leave, the EPP code endpoint is free. No "departure fee" trap.

Where to start

Grab an API key at /sign-up. The first quote is free. You're not committing to a Namecheap reseller account or signing a contract just to test the API surface.

If you want to talk to a human first, hello@domainee.dev. We're happy to walk a sandbox integration with your team.

And if you ship the feature, tell us about it. We're maintaining a list of products built on the Buy-a-Domain API.