# Services from papacasper.com on Zero

> papacasper.com serves 20 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/papacasper.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/papacasper.com/health.json

## Services

- [PapaCasper Tech Stack Fingerprint](https://www.zero.xyz/c/papacasper-tech-stack-fingerprint-2b1c327d/llms.txt): $0.01/call via x402. Analyzes a given URL and identifies the underlying technologies, frameworks, and services powering that website.
- [PapaCasper Structured Data Extract](https://www.zero.xyz/c/papacasper-structured-data-extract-dbc7666b/llms.txt): $0.01/call via x402. Extracts structured data from a webpage using CSS selectors, returning matched text content or HTML attributes for each named field
- [PapaCasper Security Headers Audit](https://www.zero.xyz/c/papacasper-security-headers-audit-a8810735/llms.txt): $0.01/call via x402. Audits a given URL's HTTP security headers and returns a structured report of their presence, configuration, and any issues found.
- [PapaCasper JSON-LD Schema Validator](https://www.zero.xyz/c/papacasper-json-ld-schema-validator-1c04065f/llms.txt): $0.01/call via x402. Validates the JSON-LD structured data markup on a given URL and reports errors, warnings, and schema compliance issues
- [PapaCasper Broken Link Checker](https://www.zero.xyz/c/papacasper-broken-link-checker-9283b3b8/llms.txt): $0.01/call via x402. Crawls a website starting from a given URL and reports all broken links found on same-origin pages, with optional external link checking.
- [PapaCasper SSL Certificate Checker](https://www.zero.xyz/c/papacasper-ssl-certificate-checker-abafd362/llms.txt): $0.01/call via x402. Checks the SSL/TLS certificate for a given hostname, returning certificate validity, expiry, and related details
- [PapaCasper Favicon & Web Manifest Checker](https://www.zero.xyz/c/papacasper-favicon-web-manifest-checker-86408b6b/llms.txt): $0.01/call via x402. Checks a website's favicon presence and web app manifest configuration by deriving the site origin from any provided URL
- [PapaCasper Sitemap URL Validator](https://www.zero.xyz/c/papacasper-sitemap-url-validator-9c1bc3ee/llms.txt): $0.01/call via x402. Validates the sitemap.xml for a given URL, checking its structure, accessibility, and compliance
- [PapaCasper Email Deliverability Check](https://www.zero.xyz/c/papacasper-email-deliverability-check-149ddfd7/llms.txt): $0.01/call via x402. Checks email deliverability configuration for a domain by auditing DNS records like SPF, DKIM, DMARC, and MX
- [PapaCasper Redirect Chain Checker](https://www.zero.xyz/c/papacasper-redirect-chain-checker-bd8c53e9/llms.txt): $0.01/call via x402. Traces the full HTTP redirect chain from a starting URL, returning each hop, status code, and final destination.
- [PapaCasper Open Port Scanner](https://www.zero.xyz/c/papacasper-open-port-scanner-5c496487/llms.txt): $0.01/call via x402. Scans a hostname or IP address for open TCP ports and returns which ports are reachable
- [PapaCasper IP Geolocation & ASN Lookup](https://www.zero.xyz/c/papacasper-ip-geolocation-asn-lookup-da1aafc4/llms.txt): $0.01/call via x402. Resolves a hostname or IPv4 address to its geographic location and Autonomous System Number (ASN) details
- [PapaCasper URL to Markdown](https://www.zero.xyz/c/papacasper-url-to-markdown-c5abd0a8/llms.txt): $0.01/call via x402. Fetches a web page by URL and returns its content converted to Markdown format
- [PapaCasper DNS Propagation Check](https://www.zero.xyz/c/papacasper-dns-propagation-check-45100a12/llms.txt): $0.01/call via x402. Checks DNS propagation for a given domain and record type across resolvers, returning current DNS record values
- [PapaCasper – Check Robots & Sitemap](https://www.zero.xyz/c/papacasper-check-robots-sitemap-5f6d15f7/llms.txt): $0.01/call via x402. Fetches and analyzes the robots.txt and sitemap files for any given website URL, returning their contents and status.
- [PapaCasper Domain Health Check](https://www.zero.xyz/c/papacasper-domain-health-check-c6b69a6f/llms.txt): $0.01/call via x402. Checks the health of a given domain, including robots.txt, sitemap, and SEO-related signals.
- [PapaCasper SEO Audit](https://www.zero.xyz/c/papacasper-seo-audit-59de0960/llms.txt): $0.01/call via x402. Performs an SEO audit on a given URL and returns structured analysis of SEO health and issues
- [PapaCasper CORS Policy Check](https://www.zero.xyz/c/papacasper-cors-policy-check-9aecc5bc/llms.txt): $0.01/call via x402. Probes a given URL and returns its CORS (Cross-Origin Resource Sharing) policy configuration and headers
- [PapaCasper Page Performance Check](https://www.zero.xyz/c/papacasper-page-performance-check-e0ec177f/llms.txt): $0.01/call via x402. Measures and audits the performance of a given webpage URL, returning performance metrics and diagnostics.
- [PapaCasper WebSocket Endpoint Check](https://www.zero.xyz/c/papacasper-websocket-endpoint-check-45a7d571/llms.txt): $0.01/call via x402. Tests whether a given WebSocket URL is reachable and responsive

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

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