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Kairostamp Evidence Snapshot
x402
Kairostamp Evidence Snapshot is a paid API for AI agents from kairostamp.com, paid per call via x402, $0.01/call, status down (last checked 2026-10-13).
Fetches a public URL server-side and returns a tamper-evident, time-stamped receipt with status, content type, byte length, SHA-256 hash, redirect chain, text preview, and hash-chain entry for evidentiary purposes.
Price / call$0.01
Success—
StatusDown
How this service works
Kairostamp evidence snapshot: server-side fetch of one public http/https URL, returning a time-stamped receipt with the response status, content type, byte length, SHA-256 of the body, redirect chain, a text preview, and a tamper-evident hash-chain entry.
Output
A time-stamped receipt object containing: the fetched URL, HTTP response status code, content type header, body byte length, SHA-256 hash of the response body, the ordered redirect chain, a plain-text preview of the content, and a tamper-evident hash-chain entry that can be later verified via Kairostamp's receipt verification endpoint.
Example use cases
Legal evidence of webpage content
“Capture a Kairostamp snapshot of https://competitor.com/pricing right now — I need a time-stamped, tamper-evident receipt with the SHA-256 hash so I can use it as evidence in a legal dispute about what they were advertising.”
Compliance audit trail for published policy
“Take a Kairostamp snapshot of https://mybusiness.com/privacy-policy today so I have a hash-chain receipt proving what our privacy policy said at this exact moment for our compliance records.”
Archiving influencer post for brand safety
“Create a timestamped Kairostamp evidence snapshot of https://socialblog.com/post/12345 — I need proof of what the page contained, including a SHA-256 hash and redirect chain, in case the content changes later.”
Technical details
Endpoint
POSThttps://kairostamp.com/api/v1/snapshot?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a cryptographically verifiable, tamper-evident record of a public URL's content at a specific point in time — especially for legal evidence, compliance auditing, or dispute resolution. It is distinct from a simple HTTP metadata check because it captures the full body hash and creates a hash-chain entry, and from a plain scrape because provenance and integrity are the primary outputs. Prefer this over the URL digest receipt sibling when you also need a text preview and the full redirect chain in addition to the hash.
Side effects
- Non-public or private URLs return an access error or 4xx response recorded in the receipt
- URLs that require authentication or cookies cannot be fetched server-side
- Very large responses may be truncated in the preview portion
- Malformed or non-HTTP/HTTPS URLs are rejected with a validation error
- URLs behind bot-detection or CAPTCHA may return unexpected content or block the fetch
- Network timeouts for slow-responding servers may result in a fetch failure
Tags
x402
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