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Web Element Motion Characteristics Extractor
Web Element Motion Characteristics Extractor is a paid API for AI agents from eg-pie-web-effect-replicator.hf.space, paid per call via MPP, $0.2/call, status unknown (last checked 2026-09-14, last successful call 2026-06-23).
Visits a public URL in headless Chromium, scopes to a specified element, and returns captured motion characteristics (CSS keyframes, WAAPI, GSAP, scroll-timeline, hover diffs, easing tokens) plus a drop-in neutral-copy HTML snippet demonstrating the motion patterns.
Price / call$0.2
Success100%
StatusUnknown
How this service works
Visits a URL in headless Chromium (multi-cohort optional), scopes to the requested element, and returns the captured MOTION CHARACTERISTICS: CSS @keyframes, WAAPI runtime entries, IntersectionObserver-driven reveals, scroll-timeline params, GSAP/ScrollTrigger config, cursor-tracking patterns, hover-state diffs, and the recurring duration/easing tokens that define the site's motion system. Includes scoped DOM HTML and computed CSS for structural reference. The drop-in `replicaHtml` snippet uses NEUTRAL PLACEHOLDER COPY — agents should substitute their own copy, brand, and visual identity. Verbatim timing/easing values are reproduced (functional properties); copy, logos, and proprietary imagery are NOT.
Output
Returns a structured object containing: captured motion data (ranked animations, motion tokens, detected libraries like GSAP/WAAPI, hover diffs, scroll-timeline params), scoped outerHTML and computed styles, font and asset metadata, a drop-in code snippet in the requested framework with neutral placeholder copy, caveats about capture limitations, and an optional interactive clone URL.
Example use cases
Example prompt
“Pull the motion characteristics from the hero section of stripe.com — I want the CSS keyframes, easing tokens, and hover-state diffs — and give me a drop-in React TSX snippet with neutral placeholder copy that I can adapt for my own brand.”
Technical details
Endpoint
POSThttps://eg-pie-web-effect-replicator.hf.space/v1/element-motionWhen to prefer
Choose this endpoint when you need structured, machine-readable motion characteristics (timing, easing, keyframe stops, animation library config) from a specific element on a live website, especially when you want a ready-to-adapt code snippet. Prefer over a full site-clone endpoint when you only need one component's motion data rather than the entire page bundle, and over manual inspection when you need the output in a programmatic format an AI agent can reason over.
Side effects
- URL is behind authentication or bot protection — headless browser blocked, returns error or empty capture
- Element selector matches nothing — scoped HTML and motion data will be empty or fall back to full hero region
- Site uses heavy canvas-based animation not expressible in CSS/WAAPI — motion data sparse, caveats populated
- Network timeout on slow or large pages — partial capture returned with caveats
- Page requires interaction (click, scroll past fold) to trigger animations — some keyframes may be missed
- Invalid URL format — schema validation error before any capture occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | Public URL to inspect. |
| context | string | Free-form natural-language description of WHAT the user wants extracted ("just the dot-globe", "the nav with the dropdown hover", "the CTA button"). Used to refine the snippet output. |
| selector | string | Optional CSS selector to scope to a single element ("main > section:first-of-type", ".cta", "#hero"). Omit to inspect the whole hero region. |
| framework | string | Target framework for the drop-in snippet. |
| colorScheme | string | Force prefers-color-scheme during capture (sites often serve different designs by theme). |
| detectCohorts | boolean | Run a multi-fingerprint pass to surface A/B variants. |
| referenceScreenshot | string | Optional base64 PNG or https URL. Overrides probe-captured pixels — use when you know which cohort/state you want replicated. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| url | string | |
| fonts | array | |
| scope | string | The selector that was scoped to. |
| assets | array | |
| motion | object | Probe-captured motion data: rankedanimations, motion tokens, detected libraries, hover diffs. |
| caveats | array | |
| snippet | object | |
| capturedAt | string | |
| elementHtml | string | outerHTML of the scoped element after hydration. |
| stylesheets | array | |
| computedStyles | array | |
| interactiveCloneUrl | string | Optional URL to a hosted offline-running clone (when call also generated a clone bundle). |
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