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payload402 DNS Liveness Lookup
x402
payload402 DNS Liveness Lookup is a paid API for AI agents from payload402.edgebytenet.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Checks whether a hostname resolves by querying A and AAAA DNS records via Cloudflare DNS-over-HTTPS
Price / call$0.001
Success—
StatusUnknown
How this service works
Domain DNS liveness: A and AAAA records via Cloudflare DNS-over-HTTPS. For agents checking whether a hostname resolves before linking or crawling.
Output
Returns a JSON object indicating whether the domain has A records (IPv4) and/or AAAA records (IPv6), the actual DNS records including IP addresses and TTL values, and metadata about the source (Cloudflare DoH). Includes hasA and hasAAAA boolean flags for quick liveness checks.
Example use cases
Pre-crawl domain liveness check
“Before you start scraping data from api.newstartup.io, check whether that domain actually resolves in DNS so we don't waste time on a dead hostname.”
Link validity check before publishing
“I'm about to publish a blog post with a link to docs.opensourceproject.org — can you verify that domain resolves in DNS first?”
Monitoring new vendor domain
“We're onboarding a new vendor at vendorplatform.net — can you check if their domain resolves and tell me what IP addresses it points to?”
Technical details
Endpoint
GEThttps://payload402.edgebytenet.workers.dev/dns/lookup?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs a fast, reliable DNS liveness check before attempting to crawl, link to, or connect to a hostname — especially when you want Cloudflare's global DNS resolver backing the check without setting up your own DNS client. Prefer this over generic HTTP reachability checks when you specifically need DNS-layer resolution (A/AAAA records) rather than full HTTP connectivity validation.
Side effects
- Domain does not resolve — returns hasA: false and hasAAAA: false with empty records array
- Invalid hostname format passed as input — may return an error or empty result
- Cloudflare DoH upstream outage — may cause request failures or timeouts
- Payment not provided or invalid — HTTP 402 response blocking the DNS query
- Rate limiting if too many requests are sent in quick succession
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"hasA": true,
"note": "DNS A/AAAA via Cloudflare DoH; not WHOIS or full DNSSEC audit",
"domain": "example.com",
"source": "cloudflare-doh",
"hasAAAA": false,
"records": [
{
"ttl": 300,
"data": "93.184.216.34",
"type": "A"
}
]
}
}Tags
x402
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