# DNS TXT Record Lookup for _acme-challenge Subdomain

> DNS TXT Record Lookup for _acme-challenge Subdomain is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Looks up the TXT DNS record for the _acme-challenge subdomain of a given domain via Cloudflare DoH and reports existence, records, and TTL

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/acme-challenge/txt?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-txt-record-lookup-for-acme-challenge-subdomain-debec59a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_txLPE3KyCkhJhXe57RM8W

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-txt-record-lookup-for-acme-challenge-subdomain-debec59a
```

Example prompt: Can you check if _acme-challenge.example.com has a TXT record set — I need to know if the DNS-01 ACME challenge record is there and what its value and TTL are?

## When to prefer this

Use this endpoint when you need a quick, targeted existence check for the _acme-challenge TXT record specifically — ideal for pre-flight checks before ACME DNS-01 certificate issuance or renewal, or for monitoring whether a challenge record has been set. Prefer this over full subdomain enumeration tools when you only need to confirm the presence of this single well-known host.

## Known failure modes

- Record does not exist — returns existence flag as false with no record data
- Domain not found or invalid — may return DNS NXDOMAIN or empty response
- Cloudflare DoH service unavailable — upstream timeout or error
- Malformed domain input — request may fail or return unexpected results
- TTL of 0 or very low — record may have just been set and not yet propagated globally

## How this service works

TXT record of _acme-challenge.<domain>: looks up the _acme-challenge host under the domain you give (TXT via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like _acme-challenge without enumerating subdomains. $0.01 per lookup.

## Output

Returns whether the _acme-challenge TXT record exists under the given domain, the full TXT record value(s) if present, and the TTL of the record, as resolved via Cloudflare DNS over HTTPS.

## 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-txt-record-lookup-for-acme-challenge-subdomain-debec59a/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)