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SiteCheck Web Intel VPN/Proxy Detector
x402
SiteCheck Web Intel VPN/Proxy Detector 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 whether a given IPv4 address belongs to a known VPN or proxy network using public threat intelligence lists
Price / call$0.002
Success—
StatusUnknown
How this service works
Checks an IPv4 address against the public X4BNet list of commercial VPN provider address ranges (about 11,000 CIDR blocks, refreshed by the list's maintainer). Returns whether the address falls in a listed VPN range and which range. A miss does not prove a direct connection, and IPv6 is not covered.
Output
Returns a JSON object with the queried IP, a boolean isVpn flag indicating VPN/proxy status, the matching CIDR range if found, the source threat intelligence list URL, the timestamp of the check, and the total number of IP ranges in the list.
Example use cases
Fraud screening for new signups
“A new user just registered with IP 45.142.212.100 — can you check if that IP is a VPN or proxy so I can decide whether to flag the account?”
Gating content by real location
“Before I serve this geo-restricted stream to the user at IP 104.28.96.45, check whether they're coming through a VPN.”
Security audit of recent logins
“We had a suspicious login from 185.220.101.33 — can you tell me if that IP is associated with any known VPN or proxy service?”
Technical details
Endpoint
GEThttps://api.webintel-api.workers.dev/api/security/vpn-proxy-detector?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call VPN/proxy detection check with no API key or subscription required. It is ideal for low-volume, on-demand checks embedded in fraud detection, access control, or security workflows where cost predictability matters. Prefer it over heavier identity/fraud platforms when you only need VPN/proxy classification from public threat intelligence lists without requiring account management.
Side effects
- Missing or malformed IP query parameter returns an error
- IPv6 addresses are not supported (endpoint expects IPv4 only)
- IP not found in any known VPN list returns isVpn: false but may not mean definitively clean
- Payment failure results in no charge and no response data
- Upstream list source temporarily unavailable may delay or fail the lookup
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ip": "2.26.157.10",
"isVpn": true,
"range": "2.26.157.0/24",
"source": "https://raw.githubusercontent.com/X4BNet/lists_vpn/main/output/vpn/ipv4.txt",
"checkedAt": "2026-10-23T09:38:33.929Z",
"rangesInList": 10941
}
}Tags
x402
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