# SiteCheck Web Intel – SURBL URI Lookup

> SiteCheck Web Intel – SURBL URI Lookup is a paid API for AI agents from api.webintel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-25).

Checks a domain against SURBL's multi-list (multi.surbl.org) to determine if it appears in spam or phishing URI blocklists, returning a 127.0.0.x response code if listed.

## Facts

- Endpoint: GET https://api.webintel-api.workers.dev/api/security/surbl-uri-lookup?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-web-intel-surbl-uri-lookup-fd42f4ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sHMlAJJvzr2PDOn97OHwp

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 sitecheck-web-intel-surbl-uri-lookup-fd42f4ed
```

Example prompt: Can you check if the domain 'cheapmeds-online.ru' is listed in SURBL's spam and phishing URI blocklists?

## When to prefer this

Choose this endpoint when you need to quickly check a domain's spam or phishing reputation against SURBL's widely-used URI blocklist — particularly useful for email security pipelines, content moderation, or pre-click link verification. Prefer this over IP-reputation checks (like CI Army) when the threat vector is a spam or phishing URI embedded in email or web content. Best suited for single-domain spot checks rather than bulk reputation scoring.

## Known failure modes

- Missing required 'domain' query parameter returns an error
- Invalid or malformed domain string may produce unexpected results
- Domain not in SURBL lists returns 'not listed' — not a safety certification
- SURBL list may have propagation delays; very new domains may not yet appear
- Rate limits or payment failures return 402 or throttle errors
- Private/internal domain names (e.g. localhost) will not be meaningful to look up

## How this service works

Checks a domain against SURBL's multi-list (multi.surbl.org): whether it appears in spam or phishing URI lists. Listed domains return a 127.0.0.x code. Not listed means not in SURBL's current lists, not that the domain is safe.

## Output

Returns a SURBL listing status for the queried domain. If listed, a 127.0.0.x DNS response code is returned indicating which SURBL sub-lists the domain appears on (spam, phishing, malware, etc.). If not listed, the response indicates absence from current SURBL lists. Note: not listed does not certify the domain as safe, only that it is not currently in SURBL's tracked lists.

## 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",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Domain name such as example.com (required)"
      }
     }
    }
   },
   "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/sitecheck-web-intel-surbl-uri-lookup-fd42f4ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.webintel-api.workers.dev](https://www.zero.xyz/host/api.webintel-api.workers.dev/llms.txt)