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is-port-443-open
x402
is-port-443-open is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-09).
Checks whether TCP port 443 (HTTPS) is open, closed, or filtered on a given host by attempting a connection from Cloudflare's edge network, returning status and connect time.
Price / call$0.01
Success—
StatusUnknown
How this service works
Is TCP port 443 (HTTPS) open on a host? Attempts a connection from Cloudflare's edge and reports open/closed/filtered with the connect time; Cloudflare-fronted hosts are reported as inconclusive because their edge answers for them. Exposure checks for HTTPS without running a scanner. $0.01 per check.
Output
Returns the status of TCP port 443 on the target host: open, closed, filtered, or inconclusive (if the host is Cloudflare-fronted, since Cloudflare's edge answers on behalf of the origin). When open, includes the TCP connect time in milliseconds. Costs $0.01 USDC per check.
Example use cases
Server HTTPS exposure audit
“Check if port 443 is open on my server at 203.0.113.45 — I need to know whether HTTPS is actually reachable from the outside before we go live.”
Firewall rule verification
“We just changed our firewall rules to block HTTPS on staging.myapp.com — can you confirm that port 443 is now closed or filtered from the outside?”
Third-party vendor connectivity check
“I need to know if vendor-api.thirdparty.com has port 443 open and how fast it responds — we're deciding whether to integrate with them.”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/port/443?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, external connectivity check for HTTPS (port 443) on a specific host without running a full port scanner or maintaining your own probe infrastructure. Ideal for verifying firewall rules, confirming HTTPS exposure before launch, or monitoring third-party service reachability. Note that Cloudflare-fronted hosts will return inconclusive results, so pair with other checks for CDN-fronted services.
Side effects
- Cloudflare-fronted hosts always return inconclusive because Cloudflare's edge intercepts the connection before reaching the origin
- Invalid or unresolvable hostname returns an error
- Timeout if the host is unreachable within Cloudflare's connection window
- Rate limiting or network filtering at the Cloudflare edge level could cause unexpected results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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