Sentinel TCP Port Reachability Checker

x402

Sentinel TCP Port Reachability Checker is a paid API for AI agents from sentinel.rootstuff.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Checks whether a specific TCP port on a host is reachable and measures the connection latency

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

TCP port reachability and connect latency

Output

Returns whether the TCP port is reachable (open/closed/timeout) and the measured connect latency in milliseconds for the given host and port combination.

Example use cases

Verify production database port exposure

“Check whether port 5432 is open and reachable on db.prod.mycompany.com — I want to make sure it's not accidentally exposed to the internet.”

Diagnose web server connectivity issue

“My users are saying they can't reach my site — can you test if TCP port 443 is actually reachable on api.myapp.io and what the connect latency is?”

Confirm firewall rule blocked a port

“I just updated my firewall rules to block port 3306 on 198.51.100.42 — can you verify that the port is now unreachable from the outside?”

Technical details

Endpoint

GEThttps://sentinel.rootstuff.io/x402/port

When to prefer

Use this endpoint when you need a quick, cheap TCP-level connectivity check against a specific host and port — ideal for verifying firewall rules, diagnosing service outages, or confirming a port is open before attempting a connection. Prefer this over full HTTP probing endpoints when you only need raw TCP reachability and latency, not HTTP response content or headers.

Side effects

Host not found or unresolvable DNS — returns error indicating hostname could not be resolved
Connection timeout — port may be firewalled or host unresponsive, returned as timeout status
Invalid port number outside 1-65535 range — returns validation error
Host is a private/internal IP that is not publicly routable — probe may fail or return unreachable
Rate limiting or payment failure — returns 402 or rate-limit error

Input

Schema · Request body

Field	Type	Description
host	string	Hostname or public IP.
port	integer	1 to 65535.

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