# DNS SVCB Lookup via DNS.SB (DoH)

> DNS SVCB Lookup via DNS.SB (DoH) is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Fetches SVCB DNS records for a domain using DNS.SB as the resolver over DNS-over-HTTPS, returning records, TTL, response code, DNSSEC validation status, and answer time.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/svcb/via/dnssb?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-svcb-lookup-via-dns-sb-doh-b722e5ff
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PWUorQztxUkt_7qFDZtGA

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 dns-svcb-lookup-via-dns-sb-doh-b722e5ff
```

Example prompt: Can you look up the SVCB records for example.com using the DNS.SB resolver and tell me the TTL, response code, whether DNSSEC was validated, and how long DNS.SB took to answer?

## When to prefer this

Use this endpoint when you specifically need SVCB record data resolved by DNS.SB (a privacy-focused public resolver) over DNS-over-HTTPS, particularly when comparing resolver behavior, checking propagation lag, or verifying DNSSEC validation status. Choose this over generic DNS lookup tools when DNS.SB's perspective is specifically needed.

## Known failure modes

- NXDOMAIN returned if the domain does not exist or has no SVCB records
- SERVFAIL returned if DNS.SB encounters an error resolving the domain
- No DNSSEC validation flag if the domain is not DNSSEC-signed
- Network timeout if DNS.SB is unreachable
- Missing or empty records array for domains with no SVCB entries

## How this service works

SVCB records for a domain as answered by DNS.SB (DNS over HTTPS): the records, TTL, response code (NOERROR/NXDOMAIN/SERVFAIL), whether the resolver validated DNSSEC, and the resolver's answer time. Compare resolvers to spot propagation lag, filtering or split-horizon answers. $0.01 per lookup.

## Output

Returns the SVCB DNS records for the queried domain as resolved by DNS.SB over HTTPS, including the record data, TTL, response code (NOERROR, NXDOMAIN, or SERVFAIL), a flag indicating whether the resolver validated DNSSEC, and the resolver's answer time in milliseconds.

## 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"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dns-svcb-lookup-via-dns-sb-doh-b722e5ff/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.intel.rallylive.ca](https://www.zero.xyz/host/dns.intel.rallylive.ca/llms.txt)