# Vextorium SEO Audit

> Vextorium SEO Audit is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-19).

Fetches and analyzes a URL's on-page SEO signals including title, meta description, headings, Open Graph tags, canonical URL, hreflang, robots, favicon, and structured data.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/seo-audit?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-seo-audit-dea8964b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9IFAGaKP_aGbz-TUYLSVI

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 vextorium-seo-audit-dea8964b -d '<json body>'
```

Example prompt: Can you run an SEO audit on https://example.com and tell me what the title, meta description, H1s, canonical tag, and Open Graph tags look like?

## When to prefer this

Use this endpoint when you need a structured, machine-readable breakdown of a webpage's on-page SEO signals in a single pay-per-call request, without managing API keys or subscriptions. It is ideal for agents automating SEO audits, comparing competitor metadata, verifying social sharing tags, or validating pre-launch pages. Prefer it over general web scraping endpoints when you specifically need normalized SEO fields like canonical, hreflang, Open Graph, and JSON-LD parsed out of the raw HTML.

## Known failure modes

- URL is unreachable or returns a non-200 status — the code field will reflect the HTTP error and other fields may be null
- Invalid or malformed URL provided — likely returns a validation error or empty result
- Page blocks crawlers via robots.txt or firewall — may return null or incomplete metadata
- SSL certificate errors on the target URL may prevent fetching
- Redirect loops or too many redirects may result in an error or partial data

## How this service works

232 pay-per-call data APIs for AI agents: official statistics and economy (ECB, Fed, Eurostat, World Bank, SEC, BOE, INE), crypto prices and sentiment, Spanish public data, compliance (sanctions, VAT, IBAN, LEI), science, weather, web and developer tools and local AI text tools. Pay in USDC via x402.

## Output

A JSON object containing the page's HTTP status code, final resolved URL, title, title length, meta description, description length, H1 and H2 arrays, canonical URL, robots directives, favicon URL, language, Open Graph properties (url, type, image, title, description, dimensions), Twitter Card properties (card type, image), hreflang tags, JSON-LD structured data blobs, and an array of SEO warnings detected.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "h1": [
   "Data APIs your AI agent pays for per call ."
  ],
  "h2": [
   "Why Vextorium",
   "Services by sector"
  ],
  "code": 200,
  "title": "Vextorium — The x402 Payment Engine",
  "robots": null,
  "favicon": "https://vextorium.com/icono.svg",
  "json_ld": [],
  "twitter": {
   "twitter:card": "summary_large_image",
   "twitter:image": "https://vextorium.com/og.png"
  },
  "hreflang": [],
  "language": "en",
  "warnings": [],
  "canonical": "https://vextorium.com/",
  "url_final": "https://vextorium.com/",
  "open_graph": {
   "og:url": "https://vextorium.com/",
   "og:type": "website",
   "og:image": "https://vextorium.com/og.png",
   "og:title": "Vextorium — The x402 Payment Engine",
   "og:description": "150 pay-per-call data APIs for AI agents. Pay in USDC on Base, Solana or Polygon with x402. No accounts, no API keys.",
   "og:image:width": "1200",
   "og:image:height": "630"
  },
  "description": "150 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, FX, validation and AI text tools. Pay in USDC via x402.",
  "title_length": 35,
  "description_length": 151
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-seo-audit-dea8964b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)