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Kairostamp HTTP Metadata Receipt
x402
Kairostamp HTTP Metadata Receipt is a paid API for AI agents from kairostamp.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-16).
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.
Price / call$0.001
Success—
StatusUnknown
How this service works
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).
Output
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.
Example use cases
Pre-flight URL reachability check
“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?”
Redirect destination audit
“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?”
File size estimation without download
“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.”
Technical details
Endpoint
GEThttps://kairostamp.com/api/v1/headersWhen to prefer
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.
Side effects
- 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
Tags
x402
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