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Attach Custom Domain to Hosted Site Slug
Attach Custom Domain to Hosted Site Slug is a paid API for AI agents from host.withzero.ai, paid per call via MPP, metered — billed by usage, status unknown (last checked 2026-09-30).
Binds a caller-owned custom domain (purchased via domain-buy) to a hosted site slug, registering it as a Cloudflare Worker Custom Domain with auto-provisioned SSL.
PriceMeteredbilled by usage
Success—
StatusUnknown
How this service works
Attach a custom domain (bought via domain-buy) to this slug. The caller must own both the slug and the domain. Calls Cloudflare to register the hostname as a Worker Custom Domain on the sites worker (SSL is auto-provisioned). Sub-paths on the custom domain serve the slug's index.html — single-file hosting model.
Output
Returns a JSON object confirming the custom domain has been registered as a Cloudflare Worker Custom Domain on the site's worker. SSL is automatically provisioned by Cloudflare. Sub-paths on the custom domain will serve the slug's index.html.
Example use cases
Portfolio site on personal domain
“I just uploaded my portfolio site to withzero under the slug 'alex-portfolio' and I bought alex-creates.com through domain-buy — can you attach that domain to the slug so my site is live at alex-creates.com?”
Startup landing page on branded domain
“My startup's landing page is hosted at slug 'launchpad-v2' on withzero. I own startuplaunchpad.io from domain-buy. Please connect that domain to the slug so visitors can reach it at startuplaunchpad.io.”
Client site delivery on custom URL
“I finished building a site for my client and uploaded it to withzero as slug 'acme-landing'. They own acme-widgets.com which I bought via domain-buy — attach it to that slug so the client's site goes live on their domain.”
Technical details
Endpoint
POSThttps://host.withzero.ai/sites/:slug/domains?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have already uploaded a static site to host.withzero.ai and want to serve it under your own branded domain that was purchased through the domain-buy service. This is the right call when you need Cloudflare-backed SSL auto-provisioning and want sub-paths on your custom domain to serve your single-file hosted site. Choose this over a generic DNS configuration when you are already within the withzero.ai hosting ecosystem.
Side effects
- Caller does not own the slug — authorization error
- Caller does not own the domain in domain-buy — ownership verification failure
- Domain format is invalid or doesn't match the required pattern — 400 validation error
- Domain is already attached to another slug — conflict error
- Cloudflare registration fails — upstream error from Cloudflare Worker Custom Domain API
- Domain length exceeds 253 characters — schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domainrequired | string | Fully-qualified domain to bind to this slug. Must be owned by caller via domain-buy. |
Output
Schema · Response
{
"type": "object"
}Reviews
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