# IP Listed on URIBL Black

> IP Listed on URIBL Black is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).

Checks whether an IPv4 address is listed on the URIBL Black DNS blocklist (black.uribl.com) and returns the listing status, return codes, and reason text.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/ip/blacklist/uribl-black?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ip-listed-on-uribl-black-eb288892
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Pnl32UN7Pu1c7yYDJmYbw

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 ip-listed-on-uribl-black-eb288892
```

Example prompt: Can you check if the IP address 203.0.113.42 is listed on the URIBL Black blocklist and tell me the return code and reason if it is?

## When to prefer this

Choose this endpoint when you need a definitive, single-list check specifically against URIBL Black (black.uribl.com) — the authoritative URI-based spam blacklist. Prefer this over generic multi-list reputation services when you need the exact URIBL return code and reason text for compliance, logging, or automated triage purposes. Best suited for email deliverability checks, inbound mail screening, or abuse investigations where URIBL Black is the specific list of concern.

## Known failure modes

- Invalid or malformed IPv4 address returns an error
- DNS resolution failure via Cloudflare DoH results in an error response
- IP not listed returns listed=false with no reason text
- Transient network issues may cause lookup timeouts

## How this service works

Is this IPv4 address listed on uribl black (black.uribl.com)? Performs the DNSBL query (reversed octets under black.uribl.com, via Cloudflare DoH) and returns listed yes/no with the return codes and, where the list publishes one, the reason text. One list, one precise answer. $0.01 per lookup.

## Output

Returns a yes/no listing status indicating whether the IPv4 address is on URIBL Black, along with the DNS return codes from the DNSBL query and, where available, the human-readable reason text published by the list.

## 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/ip-listed-on-uribl-black-eb288892/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ip.intel.rallylive.ca](https://www.zero.xyz/host/ip.intel.rallylive.ca/llms.txt)