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is-port-21-open-bulk
x402
is-port-21-open-bulk is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-11).
Checks whether TCP port 21 (FTP) is open on up to 20 hosts in a single concurrent batch call, returning ordered results with per-item error fields and a failure count.
Price / call$0.1
Success—
StatusUnknown
How this service works
Bulk is port 21 open: up to 20 hosts in one call, processed concurrently, results in input order with a per-item error field and a failure count. Same answer per item as the single endpoint. Batch enrichment for agents that hold a list. $0.10 per batch.
Output
An ordered array of results matching the input host list, where each item contains the open/closed status of port 21 and an error field if the check failed for that host. A top-level failure count indicates how many items encountered errors across the batch.
Example use cases
FTP server availability audit
“I have a list of 15 server IPs — can you check all of them to see which ones have port 21 open? I need to know which ones are running FTP before we start the migration.”
Security compliance scan for open FTP ports
“Run a bulk check on these 20 hostnames and tell me which ones have port 21 open — we're trying to identify any unauthorized FTP services on our network for the compliance report.”
Vendor FTP endpoint pre-flight check
“Before we kick off the batch file transfer job, can you verify that port 21 is reachable on all of these supplier FTP servers: ftp.vendora.com, ftp.vendorb.net, ftp.vendorc.io? Flag any that aren't responding.”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/bulk/ip/port/21?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you have a list of 2–20 hosts to check for open FTP (port 21) and want to minimize round-trips and API cost compared to calling the single-host endpoint repeatedly. It processes all hosts concurrently so total latency is roughly the same as a single check. Prefer it over the single endpoint any time you hold a batch of IPs or hostnames to scan.
Side effects
- Host unreachable or DNS resolution failure — per-item error field populated, failure count incremented
- Timeout on TCP connection attempt — individual host marked as error, others still returned
- Batch exceeds 20-host limit — request rejected or truncated
- Network firewall blocking probe traffic — port may appear closed when it is actually filtered
- Payment not processed — x402 payment required error before results are returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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