# DNSBL IP Reputation Lookup

> DNSBL IP Reputation Lookup is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Checks an IP address against multiple DNS-based blocklists (DNSBLs) to determine its spam/abuse reputation and which blocklists it appears on.

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/dnsbl-ip-reputation?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dnsbl-ip-reputation-lookup-6441be26
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7lJdAr1zGi6aIPrsIrzox

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 dnsbl-ip-reputation-lookup-6441be26
```

Example prompt: Can you check whether the IP address 192.168.1.100 is listed on any DNS-based spam blocklists like Spamhaus or Barracuda?

## When to prefer this

Use this endpoint when you need a quick, multi-zone DNSBL reputation check for a specific IP address — especially for email deliverability audits, spam source investigation, or network security workflows. It covers multiple major blocklist zones (including Spamhaus and Barracuda) in a single call and requires no API key, making it ideal for pay-per-use agent workflows where you only pay $0.002 USDC per lookup.

## Known failure modes

- Invalid or malformed IP address returns an error response
- IP not found in any zone returns empty listed_zones array
- Unreachable DNSBL zone may show null code with unlisted status
- Payment failure (402) if USDC balance insufficient on Base
- Rate limiting or timeout if upstream DNSBL resolvers are slow

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

Returns a JSON object containing the queried IP address, an array of DNSBL zones checked (each with zone name, listing status, and result code), and a summary list of zone names where the IP is actively listed.

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ip": "2.0.0.127",
  "zones": [
   {
    "code": null,
    "zone": "zen.spamhaus.org",
    "listed": false
   }
  ],
  "listed_zones": [
   "barracuda"
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dnsbl-ip-reputation-lookup-6441be26/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)