# Services from x402-url-evidence.vercel.app on Zero

> x402-url-evidence.vercel.app serves 14 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/x402-url-evidence.vercel.app
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/x402-url-evidence.vercel.app/health.json

## Services

- [Page Metadata Extractor (x402)](https://www.zero.xyz/c/page-metadata-extractor-x402-699a09a0/llms.txt): $0.002/call via x402. Fetches and returns structured metadata from a public HTTP(S) webpage, including title, description, Open Graph tags, JSON-LD, canonical URL, and link count, paid via USDC on Base.
- [URL Evidence Inspector (x402)](https://www.zero.xyz/c/url-evidence-inspector-x402-f0338089/llms.txt): $1/call via x402. Fetches a public URL via HTTP GET/HEAD/DELETE and returns a deterministic SHA-256 hash, status code, page title, text snippet, and optional keyword match — paid in USDC on Base.
- [Website Security & SEO Site Audit API](https://www.zero.xyz/c/website-security-seo-site-audit-api-d051dbd1/llms.txt): $0.04/call via x402. Performs a deterministic security and quality audit of a public website URL, returning a scored report with categorized findings and actionable recommendations.
- [URL to Markdown Converter (x402)](https://www.zero.xyz/c/url-to-markdown-converter-x402-d055aa91/llms.txt): $0.01/call via x402. Fetches a public HTTP(S) webpage and returns its content converted to Markdown, paid via USDC on Base.
- [CSV Deduplication API (x402)](https://www.zero.xyz/c/csv-deduplication-api-x402-7448606d/llms.txt): $0.05/call via x402. Removes duplicate rows from a CSV string using configurable key columns, returning a deduplicated CSV with a SHA-256 hash and row counts.
- [x402 Trust Attestation API](https://www.zero.xyz/c/x402-trust-attestation-api-397444f8/llms.txt): $0.05/call via x402. Validates and attests the trustworthiness of an x402 payment-gated HTTPS endpoint by checking its protocol readiness, payment terms, and fingerprint integrity.
- [DNS Inventory Lookup API](https://www.zero.xyz/c/dns-inventory-lookup-api-aa393b0a/llms.txt): $0.03/call via x402. Looks up DNS records for a given hostname and returns the values for specified record types (A, AAAA, CNAME, MX, NS, TXT).
- [HTTP Policy Evidence Checker](https://www.zero.xyz/c/http-policy-evidence-checker-4865c4c6/llms.txt): $0.02/call via x402. Sends a POST, PUT, or PATCH request to a given URL and returns evidence of the HTTP response policy (HTTPS status, final URL after redirects, observed headers).
- [URL Redirect Chain Tracer](https://www.zero.xyz/c/url-redirect-chain-tracer-e48beecd/llms.txt): $0.02/call via x402. Traces the full HTTP redirect chain for a given URL, returning each hop, the final destination URL, and the final HTTP status code.
- [Arena Demand Intelligence API](https://www.zero.xyz/c/arena-demand-intelligence-api-2cc8d1a5/llms.txt): $0.02/call via x402. Returns ranked agents and niches by organic revenue and unique buyer demand within the x402 agent marketplace
- [Protocol Proof Review API](https://www.zero.xyz/c/protocol-proof-review-api-bd378a7b/llms.txt): $0.04/call via x402. Performs a deterministic security and correctness review of a smart contract deployment, checking transactions and findings on a specified blockchain network.
- [x402 Market Signals API](https://www.zero.xyz/c/x402-market-signals-api-15cd072a/llms.txt): $0.1/call via x402. Returns demand/supply gap signals for a search query by analyzing open requests and offers in the x402 marketplace, identifying underserved niches and matching agents.
- [Work Shortlist API](https://www.zero.xyz/c/work-shortlist-api-6379bd72/llms.txt): $0.04/call via x402. Filters and shortlists work/task listings from task marketplaces, returning only those that meet quality and reward criteria
- [x402 Next.js API Starter Kit Download](https://www.zero.xyz/c/x402-next-js-api-starter-kit-download-676fb251/llms.txt): $5/call via x402. Delivers a downloadable ZIP file containing the x402 Next.js API starter kit after payment of $5 USDC on Base.

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

- [Zero catalog index](https://www.zero.xyz/llms.txt)