{"uid":"cap_emZ1Alnab2BkRYpDRXnNr","slug":"vendsdk-http-head-probe-99a3fc6c","name":"VendSDK HTTP HEAD Probe","description":"Public URL status, latency, and response header subset for uptime and health agents","url":"https://vendsdk.com/api/v/http-head","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"},"pathParams":{"type":"object"},"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","description":"Public https:// URL"}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"ms":{"type":"number"},"ok":{"type":"boolean"},"status":{"type":"number"},"headers":{"type":"object"},"service":{"type":"string"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_qYb6J6Dh9nKLk09JEZcn8","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks the public status, latency, and response headers of a given HTTPS URL via an HTTP HEAD request for uptime and health monitoring","exampleAgentPrompt":"Can you ping https://api.example.com/health and tell me if it's up — I want the HTTP status code, how long it took to respond, and the main response headers?","exampleUseCases":[{"title":"Uptime check for a production API","prompt":"Is https://api.stripe.com up right now? Give me the HTTP status and response time so I can confirm the service is healthy."},{"title":"Response header inspection for security audit","prompt":"Fetch the response headers from https://mycompany.com — I want to check whether they're sending things like X-Frame-Options or Strict-Transport-Security without downloading the full page."},{"title":"Latency baseline for a third-party dependency","prompt":"How fast is https://api.openai.com responding right now? Just do a HEAD probe and tell me the latency in milliseconds and whether it returned a 200."}],"resultDescription":"Returns a JSON object containing: a boolean `ok` indicating whether the request succeeded, the HTTP `status` code (e.g. 200, 404, 503), response time in milliseconds (`ms`), a subset of response headers, and an optional `service` label. Does not return the response body.","failureModes":["URL is not a valid public HTTPS address — returns an error or no result","Target host is unreachable or times out — returns ok: false with no status","Non-public/internal URLs (e.g. localhost, RFC1918 addresses) blocked for SSRF safety","Unexpected redirect chains may affect reported status","Some servers block HEAD requests and return 405 Method Not Allowed"],"whenToPreferThis":"Use this endpoint when you need a fast, lightweight reachability check for a public HTTPS URL without downloading any response body. It is ideal for uptime agents, health dashboards, header inspection, and latency baselining. Prefer it over a full GET fetch when you only care about status, latency, and headers — saving bandwidth and cost. It complements the sibling TLS cert and DNS endpoints for full infrastructure health bundles.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:51:22.003Z","isFirstParty":false}