# PapaCasper Tech Stack Fingerprint

> PapaCasper Tech Stack Fingerprint 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).

Analyzes a given URL and identifies the underlying technologies, frameworks, and services powering that website.

## Facts

- Endpoint: POST https://papacasper.com/mcp/pay/tech_stack_fingerprint
- 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-tech-stack-fingerprint-2b1c327d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ml4KmCQ_RHW4Rk-aNPb3x

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-tech-stack-fingerprint-2b1c327d -d '<json body>'
```

Example prompt: Can you fingerprint the tech stack of https://shopify.com and tell me what frameworks, CMS, CDN, and analytics tools they're using?

## When to prefer this

Choose this endpoint when you need to identify the technology stack of any publicly accessible website without setting up your own scraping infrastructure. It is particularly useful for competitive intelligence, sales prospecting enrichment, pre-audit research, or any workflow where knowing a site's CMS, framework, or third-party services is required. At $0.0002 per call it is extremely cost-effective for bulk or single-site lookups via an agent-friendly HTTP API with x402 micropayment support.

## Known failure modes

- URL is unreachable or returns a non-200 status — endpoint may return an error or empty result
- Private/intranet URLs that are not publicly accessible cannot be fingerprinted
- Heavily obfuscated or minified sites may yield incomplete or inaccurate technology detection
- Rate limiting or bot protection on the target site may block fingerprinting attempts
- Malformed URL input will result in a validation error

## 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

A structured object describing the detected technologies powering the given URL, which may include frontend frameworks (e.g. React, Vue, Next.js), CMS platforms (e.g. WordPress, Shopify), CDN providers, server software, analytics tools, advertising pixels, and other third-party services identified via HTTP headers, HTML patterns, and script analysis.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/papacasper-tech-stack-fingerprint-2b1c327d/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)