{"uid":"cap_hfM35qUk-6trxLZWJIpRr","slug":"is-port-21-open-bulk-a5b4c3c8","name":"is-port-21-open-bulk","description":"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. $0.10 per batch.","url":"https://ip.intel.rallylive.ca/bulk/ip/port/21?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.1","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_PxdrYxMuUnyM3uRd4H531","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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.","exampleAgentPrompt":"Check whether port 21 is open on these hosts: 192.168.1.1, 10.0.0.5, ftp.example.com, and 203.0.113.10 — give me a result for each one and flag any that failed.","exampleUseCases":[{"title":"FTP server availability audit","prompt":"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."},{"title":"Security compliance scan for open FTP ports","prompt":"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."},{"title":"Vendor FTP endpoint pre-flight check","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:42:31.071Z","isFirstParty":false,"canonicalSlug":"is-port-21-open-bulk-a5b4c3c8"}