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PapaCasper JSON-LD Schema Validator
x402
PapaCasper JSON-LD Schema Validator 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).
Validates the JSON-LD structured data markup on a given URL and reports errors, warnings, and schema compliance issues
Price / call$0.01
Success—
StatusUnknown
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
Returns a structured object indicating whether the JSON-LD on the target URL is valid, along with any detected errors, warnings, and information about the schema types found (e.g. Product, Article, Organization). May include field-level details about what is missing or malformed.
Example use cases
Pre-launch structured data audit
“Before I push this product page live at https://mystore.com/sneakers/air-max, can you validate its JSON-LD schema and tell me if there are any errors that would hurt my rich results in Google?”
Debug broken rich snippets
“My recipe page at https://tastyblog.com/chocolate-cake used to show rich snippets on Google but they disappeared — can you validate the JSON-LD schema on that page and tell me what's wrong?”
Agency SEO QA check
“I need to QA the structured data on a client's homepage at https://clientsite.com — please check the JSON-LD schema and give me a full list of any validation errors or warnings.”
Technical details
Endpoint
POSThttps://papacasper.com/mcp/pay/json_ld_schema_validatorWhen to prefer
Choose this endpoint when you specifically need to validate JSON-LD structured data markup on a webpage for SEO or schema.org compliance purposes. It is ideal for technical SEO audits, pre-launch QA, or debugging why rich snippets are not appearing in search results. Prefer this over generic SEO audit tools when the specific concern is structured data correctness rather than page speed, backlinks, or content quality.
Side effects
- URL is unreachable or returns a non-200 status — validation cannot proceed
- Target page has no JSON-LD at all — returns empty or no-schema result
- Malformed URL input — returns a validation or parsing error
- Page behind authentication or bot protection — content not accessible
- Timeout on slow-loading pages
- JSON-LD present but embedded in a way that is not parseable — partial results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | The URL to check |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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