# PapaCasper Favicon & Web Manifest Checker

> PapaCasper Favicon & Web Manifest Checker is a paid API for AI agents from papacasper.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Checks a website's favicon presence and web app manifest configuration by deriving the site origin from any provided URL

## Facts

- Endpoint: POST https://papacasper.com/mcp/pay/favicon_manifest_check
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/papacasper-favicon-web-manifest-checker-86408b6b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gsYzjQMSln6TaNCRlwnKR

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-favicon-web-manifest-checker-86408b6b -d '<json body>'
```

Example prompt: Can you check if https://example.com has a favicon and a proper web app manifest set up?

## When to prefer this

Choose this endpoint when you need to quickly audit whether a website has its favicon and web app manifest correctly configured, especially during SEO audits, PWA readiness checks, or pre-launch site reviews. It automatically derives the site origin so you only need any valid URL from the site. Prefer this over general-purpose scraping tools when the specific goal is branding/PWA asset validation.

## Known failure modes

- URL is malformed or unreachable — returns error or empty results
- Site blocks automated requests, causing favicon/manifest fetch to fail
- Manifest exists but is malformed JSON — may return parse errors or partial data
- Favicon served via unconventional path not detectable by standard heuristics
- Response schema is generic object — exact error structure may vary

## 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 an object detailing the presence and content of the site's favicon (e.g. whether it exists, its URL) and web app manifest (e.g. whether manifest.json was found, key fields like name, icons, theme_color, start_url). The site origin is derived automatically from the provided URL.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "description": "Any URL on the site to check (origin is derived from it)"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/papacasper-favicon-web-manifest-checker-86408b6b/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)