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SiteCheck Web Intel – SURBL URI Lookup
x402
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.
Price / call$0.002
Success—
StatusUnknown
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.
Example use cases
Email spam sender domain check
“I just got a suspicious email from someone at 'promo.discountpills247.net' — can you check if that domain is flagged in SURBL's spam or phishing URI lists?”
Pre-click phishing link verification
“Before I click this link, can you check whether 'click.free-prize-winner.com' is listed as a phishing or spam domain in SURBL?”
Automated inbound link screening
“We're building a content moderation pipeline — can you look up 'buycheapviagra.biz' in SURBL to see if it's on any spam or phishing URI blocklists?”
Technical details
Endpoint
GEThttps://api.webintel-api.workers.dev/api/security/surbl-uri-lookup?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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