{"uid":"cap_mulq3EZRRpZ6ugS76YDu7","slug":"is-port-443-open-168d4c9f","name":"is-port-443-open","description":"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. $0.01 per check.","url":"https://ip.intel.rallylive.ca/ip/port/443?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_MU4FyEKI5JwnzYxtHEXWR","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","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 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.","exampleAgentPrompt":"Can you check whether port 443 (HTTPS) is open on api.example.com — I want to know if it's reachable from the outside without running a full scanner?","exampleUseCases":[{"title":"Server HTTPS exposure audit","prompt":"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."},{"title":"Firewall rule verification","prompt":"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?"},{"title":"Third-party vendor connectivity check","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:40:44.833Z","isFirstParty":false,"canonicalSlug":"is-port-443-open-168d4c9f"}