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Tempo Halowerk – Stylesheet Time to First Render (Renderstart)
x402
Tempo Halowerk – Stylesheet Time to First Render (Renderstart) is a paid API for AI agents from tempo.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Measures the time-to-first-render (Renderstart) for a stylesheet resource on a given public URL, returning a performance finding.
Price / call$0.001
Success—
StatusUnknown
How this service works
Prüft am Objekt stylesheet den Befund Zeit bis zum sichtbaren Renderstart.
Output
Returns a performance finding containing the measured time (in milliseconds or similar unit) until the stylesheet resource first contributes to a visible render on the page, along with metadata about the tested URL and resource.
Example use cases
CSS render-start audit for new site
“I just launched a new site at https://mysite.com — can you measure the time-to-first-render for the main stylesheet and tell me if it's slow?”
Monitor stylesheet performance after deploy
“We just pushed a new CSS bundle to https://shop.example.com/assets/bundle.css — can you check the render-start time for that stylesheet so I can compare it to our baseline?”
Diagnose slow page render from stylesheet
“Users are complaining my page at https://blog.example.com feels slow to appear — can you check the render-start time specifically for the stylesheet to see if that's the bottleneck?”
Technical details
Endpoint
POSThttps://tempo.halowerk.com/v1/pruef/tempo/renderstart/stylesheetWhen to prefer
Use this endpoint when you specifically need to measure the time-to-first-render (Renderstart) for a stylesheet resource on a public URL, as opposed to checking other asset types (images, scripts, fonts) or other performance metrics (TTFB, DNS resolution time, total load time). It is distinct from the sibling script render-start endpoint.
Side effects
- URL is not publicly accessible — endpoint cannot reach the target
- URL does not serve a stylesheet resource — finding may be invalid or empty
- Timeout if the target server is very slow to respond
- Invalid CSS selector results in no matching object found
- DNS resolution failure for the target domain
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| ziel | — |
Tags
x402
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