# Domain DNS WHOIS Email Check > Domain DNS WHOIS Email Check is a paid API for AI agents from api.stablecoingateways.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29). Looks up a domain's DNS records, WHOIS/RDAP registration details, and email authentication posture (SPF, DMARC, DKIM, MTA-STS) plus HTTPS/HSTS status in a single call. ## Facts - Endpoint: GET https://api.stablecoingateways.com/v1/domain-facts?utm_source=zero.xyz - Price: $0.003/call - Payment: x402 - Status: unknown - Last checked: 2026-10-29 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/domain-dns-whois-email-check-a07c2a02 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vYyHBbyiNtNkGQMRv8Suu 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 domain-dns-whois-email-check-a07c2a02 ``` Example prompt: Can you check the DNS setup and email authentication posture for sendgrid.com — I want to know if it has SPF, DMARC, DKIM, and MTA-STS configured, plus who registered it and when it expires? ## When to prefer this Use this endpoint when you need a comprehensive, single-call snapshot of a domain's DNS infrastructure, email authentication configuration, and registration metadata. It is ideal for email deliverability audits, phishing/suspicious domain triage, vendor due diligence, and domain age checks. Prefer it over manual DNS lookups or separate WHOIS tools when you need SPF+DMARC+DKIM+MTA-STS all in one response with a signed receipt for audit trails. ## Known failure modes - Domain does not exist or has no DNS records — returns exists: false with minimal data - RDAP registry unavailable for TLD — rdap.note field explains fallback or missing registration data - DKIM selectors not found for common defaults — dkim_selectors_found may be empty - Domain pattern validation fails (too short, invalid chars) — 400 error - Payment not received or insufficient — 402 Payment Required before data is returned - HTTPS probe times out — https.reachable set to false, status may be absent ## How this service works Domain lookup (DNS, WHOIS/RDAP, email security): give a domain or hostname, get DNS records (A, AAAA, MX, NS, TXT, CAA), SPF, DMARC, DKIM and MTA-STS email-auth posture, HTTPS/HSTS status, and registrar, creation and expiry dates from registry RDAP. Use when checking a domain's setup, deliverability or age. No personal data. Signed receipt. ## Output Returns a JSON object with: DNS records (A, AAAA, MX, NS, TXT count, CAA), RDAP registration data (registrar, registered/expiry dates, nameservers, DNSSEC signed, domain availability), HTTPS probe result (reachable, HTTP status, HSTS, redirect host), email authentication posture (SPF record details, DMARC policy, DKIM selectors found, MTA-STS), whether the domain exists, data sources used, and a signed payment receipt including tx hash and response hash. ## Request schema (JSON Schema) ```json { "type": "object", "$schema": "https://json-schema.org/draft/2020-12/schema", "required": [ "input" ], "properties": { "input": { "type": "object", "required": [ "type", "method" ], "properties": { "type": { "type": "string", "const": "http" }, "method": { "enum": [ "GET" ], "type": "string" }, "headers": { "type": "object", "additionalProperties": { "type": "string" } }, "queryParams": { "type": "object", "required": [ "domain" ], "properties": { "domain": { "type": "string", "pattern": "^[A-Za-z0-9.-]{3,253}$", "description": "Registrable domain or full hostname" } }, "additionalProperties": false } }, "additionalProperties": false }, "output": { "type": "object", "required": [ "type" ], "properties": { "type": { "type": "string" }, "example": { "type": "object", "required": [ "data", "receipt" ], "properties": { "data": { "type": "object", "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "dns": { "type": "object", "properties": { "a": { "type": "array", "items": { "type": "string" } }, "mx": { "type": "array", "items": { "type": "object" } }, "ns": { "type": "array", "items": { "type": "string" } }, "caa": { "type": "array", "items": {} }, "aaaa": { "type": "array", "items": { "type": "string" } }, "txt_count": { "type": "integer" }, "dnssec_validated_answer": { "type": "boolean" } } }, "rdap": { "type": "object", "properties": { "note": { "type": "string" }, "source": { "type": "string" }, "status": { "type": "array", "items": { "type": "string" } }, "expires": { "type": "string" }, "available": { "type": "boolean" }, "registra … (truncated) ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "data": { "dns": { "a": [ "104.20.23.154" ], "mx": [ {} ], "ns": [ "hera.ns.cloudflare.com" ], "caa": [], "aaaa": [ "2606:4700:10::ac42:93f3" ] }, "rdap": { "source": "https://rdap.verisign.com/com/v1/", "available": true, "registrar": "RESERVED-Internet Assigned Numbers Authority", "registered_domain": "example.com", "registrar_iana_id": "376" }, "https": { "hsts": null, "probed": true, "status": 200, "reachable": true, "redirect_host": null }, "notes": "TLS certificate details are not inspected from Workers; https.reachable reflects a succ...", "domain": "example.com", "exists": true, "sources": [ "DNS via Cloudflare DoH (cloudflare-dns.com)" ], "mail_auth": { "spf": { "present": true, "includes": [], "all_qualifier": "-all", "dns_lookup_terms": 0, "multiple_records": false }, "dmarc": { "pct": 100, "adkim": "s", "policy": "reject", "present": true, "subdomain_policy": "reject" }, "mta_sts": false, "dkim_selectors_found": [ {} ], "dkim_selectors_checked": [ "default" ] }, "checked_at": "2026-10-22T09:01:19.207Z" }, "receipt": { "v": 1, "ts": "2026-10-22T09:00:00Z", "sig": "hex", "price": { "asset": "USDC", "amount": "3000", "network": "eip155:84532" }, "log_seq": 1, "tx_hash": "0x..", "endpoint_id": "domain-facts-v1", "request_hash": "hex", "response_hash": "hex" } } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/domain-dns-whois-email-check-a07c2a02/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from api.stablecoingateways.com](https://www.zero.xyz/host/api.stablecoingateways.com/llms.txt)