# AgentShelf Tech Hints – Response Header & HTML Stack Fingerprinting

> AgentShelf Tech Hints – Response Header & HTML Stack Fingerprinting is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-02).

Fetches lightweight technology stack hints for a given URL by inspecting HTTP response headers and HTML meta signals (generator tags, x-powered-by, analytics booleans, fingerprints) without running a browser.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/tech-hints?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-tech-hints-response-header-html-stack-fingerprinting-b11eaa96
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6-Y0KFPU5vPiPKF-_tBtc

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 agentshelf-tech-hints-response-header-html-stack-fingerprinting-b11eaa96 -d '<json body>'
```

Example prompt: Can you check what tech stack https://example.com is built on — things like the CMS, server framework, and whether it has any analytics tools — just from its headers and HTML, no browser needed?

## When to prefer this

Prefer this endpoint when you need fast, cheap technology stack detection for a URL without spinning up a headless browser — ideal for bulk lead enrichment, competitive research, or pre-audit recon where full JS rendering is unnecessary. At $0.008 USDC it is cost-effective for moderate volumes. Try the free POST /v1/sandbox/tech-hints first if available before paying.

## Known failure modes

- URL unreachable or returns non-200 status — endpoint may return error or empty hints
- URL blocks automated HTTP clients (no user-agent spoofing) — limited or missing headers
- Site uses heavy client-side rendering — HTML hints may be sparse since no browser is used
- Malformed or too-short URL input (below 8 chars) — schema validation error
- Payment failure or insufficient USDC balance — 402 response blocking execution

## How this service works

Call when an agent needs lightweight stack hints from response headers + HTML (generator, x-powered-by, fingerprints, analytics booleans). No browser. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/tech-hints first.

## Output

Returns lightweight technology stack hints derived from HTTP response headers and HTML meta elements, including detected generator tags, x-powered-by values, framework fingerprints, and boolean flags for detected analytics tools — all without requiring a headless browser.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "examples": [
    "https://example.com/"
   ],
   "maxLength": 2048,
   "minLength": 8,
   "description": "Public http(s) URL to fetch. Private, localhost, link-local, and metadata hosts are rejected."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-tech-hints-response-header-html-stack-fingerprinting-b11eaa96/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)