How do AI agents use the PlacePack API?

Agents construct a URL like https://placepack.top/api/v1/{label}:{w}x{h}.{format} and embed it as an image source. The API is stateless, requires no authentication, and returns deterministic output for any given spec.

What is the rate limit for the API?

30 requests per 60 seconds per IP address. For batch generation, use the POST /api/v1/pack endpoint to download multiple images in a single request.

Can I use PlacePack placeholders in LLM-generated UI prototypes?

Yes. Instruct the LLM to use PlacePack API URLs for any image placeholder. The URL format is self-documenting — the label and dimensions are embedded in the path.

Placeholder Images for IA & AI Agent Workflows

Information architecture deliverables and AI agent testing workflows both need reliable, labeled placeholder images. This preset generates images for IA journey maps, agent interaction diagrams, flow steps, and mobile context frames.

Size reference

Name	Dimensions	Description
journey_overview	1600x900	Journey overview — 1600×900px, wide-format image for end-to-end IA journey maps
touchpoint	1280x720	Touchpoint — 1280×720px, individual touchpoint image in a user journey or service blueprint
agent_interaction	1080x720 @2x	Agent interaction — 1080×720px @2x, high-DPI frame for AI agent interaction diagrams
flow_step	960x540	Flow step — 960×540px, compact image for individual steps in an automated workflow
mobile_context	1080x1920	Mobile context — 1080×1920px, full-screen mobile frame for mobile-first IA documentation

Why these sizes matter

AI agents that generate UI layouts or test web applications need a predictable image source. The PlacePack API returns deterministic images from a simple URL spec, making it ideal for agent workflows where the image URL is constructed programmatically. IA practitioners benefit from labeled placeholders that communicate touchpoint context in journey maps and flowcharts.

Use cases

AI agent UI testing

Use the PlacePack API to generate image URLs programmatically in agent scripts. The deterministic response means the same spec always returns the same image, making agent tests reproducible.

Service blueprint documentation

Populate service blueprint swimlane images with labeled placeholders at journey_overview or touchpoint dimensions. Labels communicate the actor and action at each stage.

Automated UI scaffolding

Agents that generate HTML or React scaffolding can embed PlacePack API URLs as placeholder image sources. The API requires no authentication and returns correct Content-Type headers.

FAQ — Frequently asked questions

How do AI agents use the PlacePack API?: Agents construct a URL like https://placepack.top/api/v1/{label}:{w}x{h}.{format} and embed it as an image source. The API is stateless, requires no authentication, and returns deterministic output for any given spec.
What is the rate limit for the API?: 30 requests per 60 seconds per IP address. For batch generation, use the POST /api/v1/pack endpoint to download multiple images in a single request.
Can I use PlacePack placeholders in LLM-generated UI prototypes?: Yes. Instruct the LLM to use PlacePack API URLs for any image placeholder. The URL format is self-documenting — the label and dimensions are embedded in the path.

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