# Services from how.is on Zero > how.is serves 23 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/how.is Live health (JSON, refreshed every minute): https://www.zero.xyz/host/how.is/health.json ## Services - [how.is Bot Verify](https://www.zero.xyz/c/how-is-bot-verify-73469f3d/llms.txt): $0.005/call via x402. Verifies whether an IP address and user-agent belong to a legitimate known crawler (Googlebot, Bingbot, GPTBot, ClaudeBot), an impostor, another bot, or a human - [how.is Brand Lookalikes](https://www.zero.xyz/c/how-is-brand-lookalikes-a03e7de7/llms.txt): $0.02/call via x402. Finds newly registered look-alike domains of a brand (typos, homoglyphs, lure words, other TLDs) from the last 14 days of zone files, each with a risk tier and signals. - [how.is Site Status Checker](https://www.zero.xyz/c/how-is-site-status-checker-5b985a38/llms.txt): $0.005/call via x402. Performs a live multi-signal check on up to 10 URLs, returning HTTP status, latency, DNS resolve time, resolved IP, TTL, nameservers, TLS certificate days remaining, and server info. - [how.is Company Lookup](https://www.zero.xyz/c/how-is-company-lookup-71e4ab11/llms.txt): $0.01/call via x402. Given a domain name, returns a structured company card including name, description, category, location, social profiles, DNS/mail/hosting providers, and domain registration details with source attribution and confidence scores. - [how.is Domain Profile Bundle](https://www.zero.xyz/c/how-is-domain-profile-bundle-e48aca0e/llms.txt): $0.025/call via x402. Returns a comprehensive domain intelligence report in one call: DNS, WHOIS, TLS, DNSSEC, email authentication, security score, blacklist status, and IP intelligence for the domain's A record. - [how.is Domain Security Score](https://www.zero.xyz/c/how-is-domain-security-score-4086d988/llms.txt): $0.005/call via x402. Returns a letter grade and numeric score for a domain's security posture, broken down by scored security categories. - [how.is TLS Certificate Inspector](https://www.zero.xyz/c/how-is-tls-certificate-inspector-e0c3939a/llms.txt): $0.005/call via x402. Returns TLS certificate validity, issuer, protocol, cipher, and days until expiry for a given domain. - [how.is IP Intelligence](https://www.zero.xyz/c/how-is-ip-intelligence-17c43860/llms.txt): $0.005/call via x402. Returns ASN, network owner, company, geolocation, privacy flags, carrier, and abuse contact for a given IPv4 or IPv6 address. - [how.is Read Page](https://www.zero.xyz/c/how-is-read-page-0dc5a6db/llms.txt): $0.005/call via x402. Fetches a web page and returns it as clean markdown with a safety verdict, robots.txt compliance, and an optional screenshot - [how.is Domain Change History](https://www.zero.xyz/c/how-is-domain-change-history-561d6ed0/llms.txt): $0.01/call via x402. Returns the full zone-file change history for a domain: when it appeared, disappeared, reappeared, and changed nameservers, from daily gTLD and .com/.net zone file scans. - [how.is Email Authentication Checker](https://www.zero.xyz/c/how-is-email-authentication-checker-33c8231f/llms.txt): $0.005/call via x402. Retrieves and evaluates SPF, DKIM, and DMARC DNS records for a domain, returning an overall email authentication posture score and recommendations. - [how.is Domain Trust Check](https://www.zero.xyz/c/how-is-domain-trust-check-13e11216/llms.txt): $0.02/call via x402. Returns a risk score, verdict (likely_safe/caution/high_risk/inconclusive), and plain-English reasons for a domain based on age, spam/abuse blocklists, and HTTPS certificate validity. - [how.is Screenshot](https://www.zero.xyz/c/how-is-screenshot-256a2152/llms.txt): $0.02/call via x402. Captures a 1280px-wide JPEG screenshot of any public URL, returning the image, final URL, HTTP status, and page title - [how.is URL Preflight Safety Check](https://www.zero.xyz/c/how-is-url-preflight-safety-check-1a917030/llms.txt): $0.005/call via x402. Runs a multi-signal safety pre-flight check on a URL before an agent fetches, reads, signs in, or pays — returning a verdict, risk score, robots.txt compliance, HTTPS validity, blocklist hits, domain age, lookalike detection, and x402 pricing. - [how.is Bot Verify Batch](https://www.zero.xyz/c/how-is-bot-verify-batch-8045a717/llms.txt): $0.005/call via x402. Batch-verify up to 100 crawler visitors (IP + user-agent + optional TLS fingerprint) to determine if each is a real known bot (Googlebot, GPTBot, ClaudeBot, etc.) or an impostor, billed per item. - [how.is Domain Availability Check](https://www.zero.xyz/c/how-is-domain-availability-check-86a64632/llms.txt): $0.005/call via x402. Checks whether a domain name is registered by querying the registry over RDAP, returning availability status and first-year/renewal pricing when registrable. - [how.is DNS Records Lookup](https://www.zero.xyz/c/how-is-dns-records-lookup-c95d397d/llms.txt): $0.005/call via x402. Fetches A, AAAA, MX, NS, TXT and other DNS records for a domain along with resolve timing. - [how.is DNSSEC Validation Check](https://www.zero.xyz/c/how-is-dnssec-validation-check-e0d6a05c/llms.txt): $0.005/call via x402. Checks whether DNSSEC is signed and validates correctly for a given domain, including chain of trust and DS/DNSKEY records. - [how.is WHOIS / RDAP Domain Lookup](https://www.zero.xyz/c/how-is-whois-rdap-domain-lookup-b188da52/llms.txt): $0.005/call via x402. Returns registrar, creation/expiry dates, nameservers, and status codes for a given domain via WHOIS/RDAP. - [how.is Domain Age Lookup](https://www.zero.xyz/c/how-is-domain-age-lookup-127f06c8/llms.txt): $0.005/call via x402. Returns the registration date, age in days/years, and newly-registered flag for a given domain name. - [how.is Page Change Watcher](https://www.zero.xyz/c/how-is-page-change-watcher-1b44b645/llms.txt): $0.005/call via x402. Monitors a public URL for content changes, storing a baseline on first call and returning a text diff with change percentage on subsequent calls. - [how.is Domain Blacklist Check](https://www.zero.xyz/c/how-is-domain-blacklist-check-f88a8d51/llms.txt): $0.005/call via x402. Checks whether the IP addresses behind a domain appear on spam and abuse blocklists. - [how.is Bot Observatory – Partner Tier](https://www.zero.xyz/c/how-is-bot-observatory-partner-tier-83bd74b9/llms.txt): $0.05/call via x402. Returns the full partner-tier dataset of bot network traffic seen in the last 7 days: every ASN, named crawler, TLS/JA4 fingerprint, and firewall rule, refreshed hourly. 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)