{"uid":"cap_NG7d5TTnx0rF-MO-8i6p_","slug":"kairostamp-url-digest-receipt-afc6e8ea","name":"Kairostamp URL Digest Receipt","description":"URL digest receipt: server-side fetch of one public http/https URL, returning a time-stamped receipt with the HTTP status, final URL, content type, byte length, SHA-256 of the response body, redirect chain, receipt id and tamper-evident hash-chain entry. Single GET query parameter (url). One call performs one fetch; there is no monitoring and no retry.","url":"https://kairostamp.com/api/v1/digest?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":null,"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":"down","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_KBfHxo9_47EgBrZJXb1xj","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","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 a tamper-evident receipt containing HTTP status, final URL, content type, byte length, SHA-256 hash, redirect chain, and a hash-chain entry for audit integrity.","exampleAgentPrompt":"Fetch https://example.com/contract.pdf and give me a tamper-evident digest receipt — I need the SHA-256 hash, HTTP status, byte length, and a hash-chain entry I can use as evidence.","exampleUseCases":[{"title":"Legal evidence of published content","prompt":"Fetch https://acme.com/press-release/acquisition-announcement.html right now and give me a timestamped receipt with the SHA-256 hash and receipt ID — I need to prove what was publicly posted at that URL today."},{"title":"File integrity checkpoint before processing","prompt":"Before I ingest this report, fetch https://data.gov/datasets/report-2024.csv and get me a digest receipt with the byte length, content type, and SHA-256 so I can confirm the file hasn't changed later."},{"title":"API response snapshot for audit log","prompt":"Hit https://api.partner.com/v2/pricing and capture a tamper-evident receipt showing the HTTP status, body hash, and timestamp — I need an audit trail of what price data they were serving this morning."}],"resultDescription":"Returns a JSON object containing: a UUID receipt_id, a fetched_at ISO timestamp, the final URL after redirects, HTTP status_code, content_type, byte_length, sha256 hash of the response body, an ordered redirect_chain array, an optional text_preview, a chain_hash (SHA-256 hash-chain entry linking this receipt to prior ones), and a previous_chain_hash for chain continuity verification.","failureModes":["Non-public or authenticated URLs return an error since the server fetches without credentials","Unreachable or offline URLs result in a connection error receipt","URLs exceeding 2048 characters are rejected by schema validation","Private/intranet URLs (e.g. localhost, 192.168.x.x) are likely blocked","Malformed URL format returns a 400-level validation error","Very large response bodies may time out or be truncated"],"whenToPreferThis":"Choose this endpoint when you need a single-point-in-time cryptographic attestation of what a URL served — combining HTTP metadata, body hash, and a tamper-evident hash chain — rather than just checking liveness or extracting readable content. Prefer it over the sibling HTTP metadata endpoint when you need the SHA-256 body hash and hash-chain linkage for audit or legal purposes. Use it when the goal is to create verifiable evidence of a URL's content that can be independently verified via Kairostamp's receipt verification endpoint.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T14:25:41.674Z","isFirstParty":false,"canonicalSlug":"kairostamp-url-digest-receipt-afc6e8ea"}