# PennyRail DNS AAAA Record Lookup

> PennyRail DNS AAAA Record Lookup is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Looks up IPv6 (AAAA) DNS records for a given domain, returning machine-readable results via a paid x402 settlement endpoint.

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/dns.records--aaaa-lookup
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-dns-aaaa-record-lookup-dff9bd1d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PAYO2pcjc0wf86lnRSnLh

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 pennyrail-dns-aaaa-record-lookup-dff9bd1d -d '<json body>'
```

Example prompt: Can you look up the AAAA DNS records for example.com and tell me what IPv6 addresses it resolves to?

## When to prefer this

Choose this endpoint when you specifically need IPv6 (AAAA) DNS records for a domain and want a machine-readable, pay-per-call result without managing your own DNS resolver infrastructure. It is appropriate for lightweight, on-demand DNS lookups in agent workflows where cost per call ($0.001 USDC) is acceptable and no free alternative is wired in. Prefer a traditional DNS library or free resolver API if you need bulk lookups or have no x402 payment capability.

## Known failure modes

- Domain does not exist (NXDOMAIN) — returns empty or error result
- Domain exists but has no AAAA records — returns empty record set
- Invalid domain name format in input — may return validation error
- Network or upstream DNS resolver timeout — service error response
- Payment settlement failure — x402 payment not accepted, request blocked

## How this service works

Machine-readable settlement service

## Output

Returns a machine-readable DNS response containing the AAAA record(s) for the queried domain, including the associated IPv6 address(es) and relevant DNS metadata such as TTL values. The response schema is open-ended and may include additional DNS resolution details.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-dns-aaaa-record-lookup-dff9bd1d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pennyrail.vercel.app](https://www.zero.xyz/host/pennyrail.vercel.app/llms.txt)