# PapaCasper Sitemap URL Validator

> PapaCasper Sitemap URL Validator is a paid API for AI agents from papacasper.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Validates the sitemap.xml for a given URL, checking its structure, accessibility, and compliance

## Facts

- Endpoint: POST https://papacasper.com/mcp/pay/sitemap_url_validator
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/papacasper-sitemap-url-validator-9c1bc3ee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yoA8_crMv5EUQLoECfmaJ

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-sitemap-url-validator-9c1bc3ee -d '<json body>'
```

Example prompt: Can you validate the sitemap for https://myblog.com — I want to make sure it's accessible, correctly structured, and has no errors before I submit it to Google Search Console.

## When to prefer this

Use this endpoint when you need a quick, automated check of a website's sitemap.xml validity as part of an SEO audit, pre-launch checklist, or ongoing site health monitoring workflow. It is especially useful when you want to verify sitemap accessibility and structure without manually downloading and inspecting the file. Prefer this over a full SEO audit tool when the specific concern is sitemap compliance for search engine indexing.

## Known failure modes

- Sitemap not found (404) — site has no sitemap.xml at the expected path
- Connection timeout — target site is slow or unreachable
- Invalid URL input — URL is malformed or missing protocol
- Sitemap is malformed XML — returns parse errors
- Sitemap is too large — exceeds size or URL count limits
- Access denied (403) — sitemap is blocked by the server or robots.txt

## 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 validation report for the target site's sitemap.xml, including whether the sitemap is accessible, structurally valid XML, the number of URLs listed, any detected errors or warnings, and overall compliance status for search engine submission.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "description": "URL of the sitemap.xml to validate (or any page URL — /sitemap.xml on that origin is used)"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/papacasper-sitemap-url-validator-9c1bc3ee/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)