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Sitemap Lastmod Freshness
x402
Sitemap Lastmod Freshness is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Checks whether a sitemap's lastmod timestamp is within a caller-defined freshness budget and returns a deterministic pass/advisory verdict
Price / call$0.001
Success—
StatusUnknown
How this service works
Sitemap Lastmod Freshness: Sitemap Lastmod Freshness calculates sitemap lastmod age against a caller freshness budget from bounded caller-supplied values without an external provider. Call Sitemap Lastmod Freshness before accepting, caching, redirecting, or retrying a caller-supplied web response. Returns normalized web evidence, the computed finding, and an explicit pass or advisory status for Sitemap Lastmod Freshness as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First…
Output
Returns versioned deterministic JSON containing the computed age of the lastmod relative to now, a normalized web evidence object, the specific finding, and an explicit pass or advisory status indicating whether the lastmod falls within the caller's freshness budget.
Example use cases
Pre-cache freshness gate
“Before I cache this sitemap entry, check if its lastmod epoch of 1719800000 is still fresh enough given the current epoch is 1720000000 and my freshness budget is 3600 seconds.”
Crawl scheduler freshness filter
“My crawler is at epoch 1720050000 and pulled a sitemap lastmod of 1718000000 — is that within a 604800-second freshness window, or should I flag it as stale?”
Redirect guard before retry
“Before retrying this request, tell me if the sitemap lastmod epoch 1719990000 is acceptable given the current epoch 1720000000 and a maximum age of 7200 seconds.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/sitemap-lastmod-freshnessWhen to prefer
Use this endpoint when you need a deterministic, stateless freshness verdict for a sitemap lastmod timestamp against a caller-defined budget — especially when you want no external dependencies, no data retention, and an explicit pass/advisory status in structured JSON. Prefer this over custom logic when you need a versioned, auditable freshness check before caching, accepting, redirecting, or retrying a web response.
Side effects
- Missing required fields (now_epoch, lastmod_epoch, or maximum_age_seconds) result in a validation error
- Non-integer epoch or age values cause schema rejection
- lastmod_epoch in the future relative to now_epoch may produce unexpected age calculations
- Payment failure via x402 prevents the call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| now_epoch | integer | Now Epoch supplied to Sitemap Lastmod Freshness; used only for this bounded calculation and processed in memory without retention. |
| lastmod_epoch | integer | Lastmod Epoch supplied to Sitemap Lastmod Freshness; used only for this bounded calculation and processed in memory without retention. |
| maximum_age_seconds | integer | Maximum Age Seconds supplied to Sitemap Lastmod Freshness; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"fresh": true,
"age_seconds": 600000
},
"schema": "delx/util-sitemap-lastmod-freshness/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "16e1ecba10c25f7069865c397d7f7ed1932357b7ff29f262c9b4d686d1033831",
"external_calls": 0
},
"operation": "web_reliability:sitemap_lastmod_freshness"
}
}Tags
x402
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