# DNS HTTPS/SVCB Record Lookup

> DNS HTTPS/SVCB Record Lookup is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Looks up DNS HTTPS/SVCB service binding records for a domain, revealing HTTP/3 (QUIC), HTTP/2 ALPN support, ECH configuration, and IP hints at the DNS level.

## Facts

- Endpoint: GET https://intel.rallylive.ca/dns/https
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-https-svcb-record-lookup-ec49b7f8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xHvOGB2CwgGt40nNYBZuY

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-https-svcb-record-lookup-ec49b7f8
```

Example prompt: Check the DNS HTTPS record for cloudflare.com and tell me whether it advertises HTTP/3 support and if there are any ECH or IP hints.

## When to prefer this

Use this endpoint when you need to determine whether a domain advertises HTTP/3 (QUIC) or HTTP/2 support at the DNS layer via HTTPS/SVCB records, or when you need to discover ECH public keys and IP hints published in DNS. Prefer this over general DNS lookups (A, AAAA, TXT) when specifically investigating modern protocol support and service binding metadata.

## Known failure modes

- Domain has no HTTPS/SVCB record — returns empty or NODATA response
- Invalid or non-existent domain — DNS resolution failure
- DNS timeout — upstream resolver unreachable
- Malformed domain input — request rejected
- Payment not included or insufficient — 402 Payment Required

## How this service works

DNS HTTPS/SVCB record lookup: service binding records that advertise HTTP/3 and HTTP/2 (ALPN), ECH and IP hints for a domain. Shows whether a site supports HTTP/3 at the DNS level. $0.01 per lookup.

## Output

Returns the parsed DNS HTTPS/SVCB record for the queried domain, including service priority, ALPN protocol list (e.g. h3, h2), ECH configuration blob if present, and IPv4/IPv6 address hints. Indicates whether HTTP/3 is advertised at the DNS level.

## 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-https-svcb-record-lookup-ec49b7f8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)