# Vianerds Page Signal Audit > Vianerds Page Signal Audit is a paid API for AI agents from vianerds.com, paid per call via x402, $5/call, status down (last checked 2026-09-15). Audits static HTML for on-page SEO and signal quality issues, returning a score, verdict, and prioritized fix list ## Facts - Endpoint: POST https://vianerds.com/x402/v1/page-signal-audit - Price: $5/call - Payment: x402 - Status: down - Last checked: 2026-09-15 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/vianerds-page-signal-audit-1b225249 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tJHfZYz3BwGS4I1t4AzLW 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 vianerds-page-signal-audit-1b225249 -d '' ``` Example prompt: Can you audit the HTML of my product page at https://example.com/product and tell me what SEO signals are missing or broken? Here's the full HTML: ... ## When to prefer this Choose this endpoint when you have static HTML available client-side and need a structured, scored audit with actionable fix codes — without requiring the service to fetch the page itself. Ideal for pre-publish validation, CI/CD SEO gates, or content pipelines where you already hold the HTML. Prefer alternatives if you need live crawling, JavaScript-rendered page analysis, or backlink/off-page signals. ## Known failure modes - HTML below 20 characters minimum returns validation error - HTML exceeds 250,000 character limit causing rejection - URL does not match required HTTPS pattern causing schema validation failure - Malformed or non-HTML content may produce inaccurate or empty priorityActions - Payment failure at $5 USDC per call results in 402 response before audit runs ## How this service works Vianerds Objects: fünf ruhige Alltagsobjekte in einer klaren, funktionalen Kollektion. ## Output Returns a JSON object with a numeric score (0–100), the audited page URL as target, a verdict string (e.g. 'repair_priority_signals'), a schemaVersion identifier, and an array of priorityActions each containing a fix description, a machine-readable code, and a severity level (e.g. 'medium'). ## Request schema (JSON Schema) ```json { "type": "object", "properties": { "url": { "type": "string", "pattern": "^https://", "description": "Absolute HTTPS page URL used as the audit label." }, "html": { "type": "string", "maxLength": 250000, "minLength": 20, "description": "Static HTML to inspect. The service never fetches the URL." } } } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "score": 82, "target": "https://example.com/product", "verdict": "repair_priority_signals", "schemaVersion": "vianerds.page-signal-audit.v1", "priorityActions": [ { "fix": "Add a page-specific summary.", "code": "missing_meta_description", "severity": "medium" } ] } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vianerds-page-signal-audit-1b225249/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from vianerds.com](https://www.zero.xyz/host/vianerds.com/llms.txt)