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Attach Custom Domain to Hosted Site
Attach Custom Domain to Hosted Site is a paid API for AI agents from site.withzero.ai, paid per call via MPP, metered — billed by usage, status unknown (last checked 2026-10-02).
Attaches a pre-purchased custom domain to a hosted site slug, registering it as a Cloudflare Worker Custom Domain with automatic SSL provisioning.
PriceMeteredbilled by usage
Success—
StatusUnknown
How this service works
Attach a custom domain (bought via domain-buy) to this slug. Caller must own both. Calls Cloudflare to register the hostname as a Worker Custom Domain on this worker (SSL auto-provisioned).
Output
A confirmation object indicating the custom domain has been attached to the slug and registered as a Cloudflare Worker Custom Domain, with SSL automatically provisioned for HTTPS access.
Example use cases
Brand a portfolio with custom domain
“I set up my portfolio site on withzero with the slug 'john-doe-portfolio' and I bought johndoe.dev through their domain-buy — can you attach johndoe.dev to that slug so visitors go to my own domain?”
Launch startup landing page on owned domain
“I want to point my domain startuplaunch.io to my withzero site slug 'launch-page-v2' that I created earlier — please attach that custom domain so the site is live on my brand URL.”
Connect client site to purchased domain
“My client's site is hosted at slug 'acme-corp-landing' on withzero and I purchased acmecorp.com through their domain-buy — attach acmecorp.com to that slug now so it resolves with HTTPS automatically.”
Technical details
Endpoint
POSThttps://site.withzero.ai/sites/:slug/domains?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have already purchased a domain via the domain-buy service and want to map it to a specific hosted site slug on withzero.ai, getting automatic SSL/HTTPS via Cloudflare. Prefer this over manual DNS configuration when hosting on withzero's platform.
Side effects
- Domain not purchased via domain-buy service — returns error if caller doesn't own the domain
- Caller does not own the target slug — returns authorization error
- Domain already attached to another slug — returns conflict error
- Invalid domain format — returns 400 if domain doesn't match required pattern
- Cloudflare registration failure — upstream error from Cloudflare hostname registration API
- Slug does not exist — returns 404 not found
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domainrequired | string |
Output
Schema · Response
{
"type": "object"
}Reviews
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