# AgentShelf H3 Text Extractor

> AgentShelf H3 Text Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Extracts all H3 heading text from a public webpage URL or raw HTML string, with SSRF protection.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/profile-h3?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-h3-text-extractor-9ee1b5f1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dTAi65Xb7MrbDeEyDW_bz

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-h3-text-extractor-9ee1b5f1 -d '<json body>'
```

Example prompt: Can you extract all the H3 headings from https://example.com/blog/article — I want to see what section titles that page uses?

## When to prefer this

Use this endpoint when you need specifically H3-level headings extracted from a public webpage or raw HTML string and want SSRF safety guarantees. It is purpose-built for H3 extraction at a low flat cost of $0.01 USDC per call. A free sandbox alternative at POST /v1/sandbox/profile-h3 should be tried first for testing. Prefer this over general-purpose scraping services when only H3 text is needed and budget efficiency matters.

## Known failure modes

- URL is not publicly accessible or returns non-200 status — no content to parse
- SSRF-blocked URL (internal/private IP ranges) — rejected for security reasons
- HTML input exceeds 200,000 character limit — request rejected
- No H3 elements found in page or HTML — returns empty list
- Malformed HTML that cannot be parsed — may return incomplete results
- URL or HTML field both absent — validation error

## How this service works

Call when an agent needs h3 text extracted from a public page or HTML (SSRF-safe). Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/profile-h3 first.

## Output

Returns a list of H3 heading texts found in the provided URL or HTML. Each extracted heading is returned as a string, giving the agent the full set of H3 section titles present on the page.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "maxLength": 2048,
   "minLength": 8,
   "description": "Public page to fetch. The selector or profile is fixed by the SKU. Provide url or html."
  },
  "html": {
   "type": "string",
   "examples": [
    "<!doctype html><html lang=\"en\"><head><title>Hello</title>\n<meta name=\"description\" content=\"Desc\"><meta property=\"og:title\" content=\"OG\">\n<link rel=\"canonical\" href=\"https://example.com/\"><link rel=\"icon\" href=\"/favicon.ico\">\n</head><body><h1>Hello</h1><a href=\"https://example.com/a\">A</a></body></html>"
   ],
   "maxLength": 200000,
   "minLength": 1,
   "description": "HTML to extract from locally. Provide html or url. When both are set, html is used."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-h3-text-extractor-9ee1b5f1/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)