# Penniless Data Utilities – WHOIS / RDAP Domain Lookup > Penniless Data Utilities – WHOIS / RDAP Domain Lookup is a paid API for AI agents from penniless-json-repair.sjaman.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14). Returns structured WHOIS/RDAP registration data for a domain, including registrar, nameservers, status flags, DNSSEC status, and registration/expiration dates. ## Facts - Endpoint: POST https://penniless-json-repair.sjaman.workers.dev/domain/whois - Price: $0.001/call - Payment: x402 - Status: unknown - Last checked: 2026-09-14 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/penniless-data-utilities-whois-rdap-domain-lookup-35123749 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Vbox8r8EC3XS8__1sQuw3 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 penniless-data-utilities-whois-rdap-domain-lookup-35123749 -d '' ``` Example prompt: Can you look up the WHOIS registration details for openai.com — I want to know the registrar, nameservers, expiration date, and whether it's DNSSEC signed? ## When to prefer this Choose this endpoint when you need structured, machine-readable WHOIS/RDAP data without parsing raw WHOIS text. It is ideal for domain expiry checks, registrar lookups, nameserver verification, DNSSEC audits, and due-diligence workflows where a clean JSON response is required. At $0.001 USDC per call via x402 micropayments, it is cost-effective for high-volume domain intelligence tasks. Prefer this over scraping WHOIS directly when deterministic output and no external AI dependencies are required. ## Known failure modes - Domain not found in RDAP/WHOIS — returns ok:true, found:false - Invalid or malformed domain name input — likely returns an error response - Registry temporarily unavailable — network-level or upstream RDAP registry timeout - TLD not supported by RDAP — some ccTLDs may not have RDAP coverage - Rate limiting from upstream RDAP registries causing delayed or failed responses ## How this service works Deterministic, dependency-free data utilities served over x402 micropayments (USDC on Base). None of these call another AI model. Keyword: JSON repair Keyword: malformed JSON Keyword: broken JSON from LLM Keyword: fix JSON output Keyword: JSON sanitizer Keyword: truncated JSON recovery Keyword: YAML to JSON Keyword: convert YAML Keyword: parse YAML config Keyword: cron next run Keyword: cron parser Keyword: when does cron run next Keyword: unified diff Keyword: line diff Keyword: text diff Keyword: HTML to text Keyword: extract links Keyword: extract emails Keyword: scrape text Keyword: whois lookup Keyword: domain registration Keyword: registrar Keyword: domain expiry date Keyword: RDAP Keyword: dns lookup Keyword: MX records Keyword: TXT records Keyword: A record Keyword: DNS over HTTPS Keyword: github repo stats Keyword: github stars Keyword: repository popularity Keyword: OSS project metadata Keyword: email validation Keyword: verify email address Keyword: check MX deliverability Keyword: email syntax Use case: repair a JSON code block wrapped in Markdown fences Use case: turn a docker-compose or CI YAML file into JSON Use case: compute the next UTC fire time of a cron expression Use case: produce a unified diff between two versions of a file Use case: strip HTML tags and pull out links, emails, and headings Use case: look up a domain's registrar, status and expiry before purchase Use case: check when a domain registration lapses Use case: resolve A, AAAA, MX, TXT or NS records for a hostname Use case: find a domain's mail servers and SPF TXT record Use case: compare GitHub repository stars, forks and activity for market research Use case: check whether an email address is well-formed and its domain accepts mail ## Output A JSON object with fields: ok (boolean), found (boolean), domain (string), registrar (string), nameservers (array of strings), status (array of status strings like 'client transfer prohibited'), dnssec.signed (boolean), and events containing ISO-8601 registration and expiration timestamps. ## Request schema (JSON Schema) ```json { "$schema": "https://json-schema.org/draft/2020-12/schema", "type": "object", "properties": { "input": { "type": "object", "properties": { "type": { "type": "string", "const": "http" }, "method": { "type": "string", "enum": [ "POST" ] }, "bodyType": { "type": "string", "enum": [ "json", "form-data", "text" ] }, "body": { "type": "object", "properties": { "domain": { "type": "string", "description": "Domain name, no scheme" } }, "required": [ "domain" ], "additionalProperties": false } }, "required": [ "type", "method", "bodyType", "body" ], "additionalProperties": false }, "output": { "type": "object", "properties": { "type": { "type": "string" }, "example": { "type": "object" } }, "required": [ "type" ] } }, "required": [ "input" ] } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "ok": true, "found": true, "dnssec": { "signed": true }, "domain": "example.com", "events": { "expiration": "2027-08-14T04:00:00Z", "registration": "1995-08-14T04:00:00Z" }, "status": [ "client transfer prohibited" ], "registrar": "Example Registrar, Inc.", "nameservers": [ "a.iana-servers.net", "b.iana-servers.net" ] } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/penniless-data-utilities-whois-rdap-domain-lookup-35123749/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from penniless-json-repair.sjaman.workers.dev](https://www.zero.xyz/host/penniless-json-repair.sjaman.workers.dev/llms.txt)