# KiHustle Critical CSS Hint

> KiHustle Critical CSS Hint is a paid API for AI agents from kihustle.tech, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-13).

Analyzes an HTML document and returns a hint for which CSS is critical (above-the-fold) to improve page load performance.

## Facts

- Endpoint: POST https://kihustle.tech/nexus/api/v1/critical-css-hint?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kihustle-critical-css-hint-e875c50b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LrxEAUETeU5A1uYyaFtoE

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability kihustle-critical-css-hint-e875c50b -d '<json body>'
```

Example prompt: Can you analyze this HTML and tell me which CSS is critical so I can inline it for faster page loads? Here's the HTML: <!DOCTYPE html><html><head><link rel='stylesheet' href='/styles.css'></head><body><h1>Hello World</h1></body></html>

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call service to identify critical CSS from raw HTML strings, especially in automated pipelines or agent workflows where you want to optimize web page rendering without maintaining your own CSS analysis infrastructure.

## Known failure modes

- Empty or malformed HTML input may return an error or unexpected result
- Very large HTML documents may time out or be rejected
- Missing 'html' field in the request body likely returns a validation error
- Non-HTML content passed as HTML may produce irrelevant hints

## How this service works

Kostenlose Guides, Solo-Playbooks und Artikel zu KI, Automation und Side Hustles — für Menschen, die mit echten Systemen online Einkommen aufbauen wollen. Transparent finanziert über faire Affiliate-Links.

## Output

Returns a JSON object with a 'result' field (e.g. 'processed') and a 'status' field (e.g. 'success'), indicating whether the HTML was analyzed and a critical CSS hint was generated. The response may include hints about which CSS rules are critical for above-the-fold rendering.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "html": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": "processed",
  "status": "success"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kihustle-critical-css-hint-e875c50b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kihustle.tech](https://www.zero.xyz/host/kihustle.tech/llms.txt)