# PapaCasper Page Performance Check

> PapaCasper Page Performance Check is a paid API for AI agents from papacasper.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-17).

Measures and audits the performance of a given webpage URL, returning performance metrics and diagnostics.

## Facts

- Endpoint: POST https://papacasper.com/mcp/pay/page_performance_check
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/papacasper-page-performance-check-e0ec177f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_igAJCVjymqY_mv30FiRNh

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 papacasper-page-performance-check-e0ec177f -d '<json body>'
```

Example prompt: Can you run a performance check on https://example.com and tell me how fast the page loads and where the bottlenecks are?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call performance measurement of a specific webpage without setting up your own infrastructure. Ideal for one-off checks, automated agent workflows, or when you need performance data integrated directly into an AI pipeline via MCP over HTTP.

## Known failure modes

- Invalid or unreachable URL — endpoint may return an error or empty result
- URL behind authentication or firewall — page may not load correctly for measurement
- Timeout if the target page is extremely slow to respond
- Malformed URL input causing validation failure

## How this service works

A hosted MCP server exposing utility tools any AI agent can call over HTTP — page-to-markdown, SEO audits, robots/sitemap checks, and more.

## Output

Returns a performance report for the given URL, including metrics such as page load time, performance score, and other diagnostics that indicate how well the page is performing.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "description": "The URL to measure"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/papacasper-page-performance-check-e0ec177f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from papacasper.com](https://www.zero.xyz/host/papacasper.com/llms.txt)