{"uid":"cap_82d0_AVY5kohrxSIkfQKu","slug":"kairostamp-http-metadata-receipt-424db91a","name":"Kairostamp HTTP Metadata Receipt","description":"URL HTTP metadata receipt: server-side fetch of one public http/https URL, returning only transport metadata — HTTP status, final URL, redirect chain, content type and byte length — plus a receipt id. The response body is not returned and no content preview is stored. Single GET query parameter (url).","url":"https://kairostamp.com/api/v1/headers","method":"GET","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_BTjoGQR-QskG39M-Dcgym","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x036CbD53842c5426634e7929541eC2318f3dCF7e","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches a public URL server-side and returns only HTTP transport metadata (status code, final URL, redirect chain, content type, byte length) plus a receipt ID — no response body is returned or stored.","exampleAgentPrompt":"Can you probe https://example.com/report.pdf server-side and tell me the HTTP status, content type, byte size, and whether it redirected anywhere — without actually downloading the file?","exampleUseCases":[{"title":"Pre-flight URL reachability check","prompt":"Before we embed this link in the newsletter, can you check if https://acme.com/press-release is reachable, what status code it returns, and what content type it serves?"},{"title":"Redirect destination audit","prompt":"I need to know if https://bit.ly/3xK9mZp redirects and where it ultimately lands — can you trace the full redirect chain and tell me the final URL and HTTP status?"},{"title":"File size estimation without download","prompt":"What's the byte size and content type of https://cdn.example.com/assets/dataset.csv? I want to know how large it is before deciding whether to process it."}],"resultDescription":"A JSON object containing a unique receipt_id (UUID), and an 'http' object with: the final URL after redirects, a fetched_at ISO-8601 timestamp, HTTP status code (integer), content_type (string or null), byte_length (integer), and redirect_chain (ordered array of intermediate URLs). The response body of the fetched URL is never returned.","failureModes":["Non-public or firewalled URLs may return connection errors or timeouts","Malformed or non-HTTP/HTTPS URLs will be rejected by schema validation","URLs that return very large responses may hit byte-read limits","The target server may block server-side user agents, resulting in 403 or 429 status codes","DNS resolution failures for unknown hosts will produce an error response"],"whenToPreferThis":"Choose this endpoint when you need lightweight HTTP transport metadata for a URL — status, content type, size, or redirect chain — without needing the actual response body. It is ideal for pre-flight checks, link validation, redirect auditing, and size estimation. Prefer it over a full fetch/scrape endpoint when you only care about headers and transport-level facts, and when having a timestamped receipt ID for auditability is useful.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-16T00:44:48.891Z","isFirstParty":false}