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tempo.halowerk.com – Image Render-Start Time Check
x402
tempo.halowerk.com – Image Render-Start Time Check 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-visible-render (Renderstart) for an image resource at a given public URL.
Price / call$0.001
Success—
StatusUnknown
How this service works
Prüft am Objekt bild den Befund Zeit bis zum sichtbaren Renderstart.
Output
Returns the measured time-to-first-visible-render (Renderstart) for the specified image resource, indicating how long it takes from request initiation until the image begins appearing visually in the browser.
Example use cases
Hero image render audit
“Can you measure the time-to-first-visible-render for the hero image at https://mystore.com/assets/banner.jpg? I want to know if it's slowing down the perceived load of my homepage.”
E-commerce product image benchmark
“Run a render-start time check on the product image at https://shop.example.com/products/shoe-main.png — I need the Renderstart latency so I can decide whether to optimize it.”
Performance regression monitoring
“Check the render start time for the image at https://cdn.mysite.com/logo.webp using the CSS selector #site-logo, and tell me how long it takes to visually appear — I'm tracking whether a recent deploy made it slower.”
Technical details
Endpoint
POSThttps://tempo.halowerk.com/v1/pruef/tempo/renderstart/bildWhen to prefer
Use this endpoint when you need to specifically measure the time-to-first-visible-render (Renderstart) for an image resource, as opposed to other timing metrics like TTFB or TLS handshake time. It is most appropriate for web performance auditing, continuous monitoring of image load UX, or diagnosing why images appear slow to users. Choose it over page-level render-start checks when you need per-image granularity rather than full-page metrics.
Side effects
- Target URL is not publicly accessible or returns a non-200 status — endpoint returns an error
- Image URL resolves to a non-image resource — measurement may fail or be invalid
- CSS selector matches no element or multiple elements — first match used or error returned
- Target server is too slow or times out during probe — timeout error returned
- Malformed URL or URL exceeding 2048 characters — validation error returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| ziel | — |
Tags
x402
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