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is-port-587-open
x402
is-port-587-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 2026-10-13).
Checks whether TCP port 587 (SMTP Submission) is open, closed, or filtered on a given host by attempting a connection from Cloudflare's edge network.
Price / call$0.01
Success—
StatusUnknown
How this service works
Is TCP port 587 (Submission) 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 Submission without running a scanner. $0.01 per check.
Output
Returns whether TCP port 587 is open, closed, or filtered on the target host, along with the connection time in milliseconds. If the host is Cloudflare-fronted, the result is reported as inconclusive because Cloudflare's edge answers the connection rather than the origin server.
Example use cases
Mail server delivery configuration audit
“I'm setting up a new mail server at smtp.mycompany.com — can you check if port 587 is open and reachable so I can confirm the submission port is correctly exposed before I point MX records at it?”
Security exposure check for email port
“We've had a misconfiguration incident before — can you probe port 587 on 203.0.113.45 and tell me if it's open, closed, or filtered? I want to know if SMTP submission is accidentally exposed.”
Third-party mail relay reachability test
“I'm troubleshooting email delivery issues through our relay at relay.partnerco.io — can you check from the outside whether port 587 is reachable on that host, and how fast the connection responds?”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/port/587?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, external probe of TCP port 587 on a specific host without running your own port scanner or network tooling. It is especially useful for email infrastructure validation, security audits of SMTP Submission exposure, and monitoring whether a mail relay is reachable — all from a neutral Cloudflare-edge vantage point. Prefer it over generic port scanners when you want a lightweight, pay-per-check approach with no setup required.
Side effects
- Host is Cloudflare-fronted: result returned as inconclusive because Cloudflare's edge terminates the TCP connection
- Invalid or unresolvable hostname: likely returns an error or filtered status
- Network timeout on heavily firewalled hosts: may report filtered rather than closed
- Rate limiting or payment failure: call not executed if USDC payment of $0.01 is not settled
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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