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Age Header Validate
x402
Age Header Validate 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).
Validates whether an HTTP Age header value fits within a declared freshness lifetime (max-age), returning a deterministic pass/fail finding as versioned JSON.
Price / call$0.001
Success—
StatusUnknown
How this service works
Age Header Validate: Age Header Validate checks whether an HTTP Age value fits a declared freshness lifetime from bounded caller-supplied values without an external provider. Call Age Header Validate 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 Age Header Validate as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, me…
Output
Returns versioned deterministic JSON containing: normalized web evidence (the supplied Age and max-age values), the computed finding (age delta vs freshness limit), and an explicit pass or advisory status indicating whether the HTTP Age value fits within the declared freshness lifetime.
Example use cases
Cache freshness check before serving
“I have a cached HTTP response with an Age header of '1800' and the original Cache-Control max-age is 3600 seconds — can you tell me if it's still fresh or stale?”
Reject stale response before redirect
“Before I redirect the user, I need to validate this HTTP response — it has an Age of '86500' and a max-age of 86400 seconds. Is it past its freshness window?”
Agent pipeline cache validation
“My agent just received a web response with Age set to '250'. The allowed freshness lifetime is 300 seconds. Run a freshness check and tell me if it passes or if I should retry.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/age-header-validateWhen to prefer
Choose this endpoint when you need a stateless, deterministic, no-external-dependency check of HTTP Age header freshness against a known max-age value — especially in agentic pipelines that must accept, cache, redirect, or retry web responses and need an auditable pass/fail record. Prefer it over manual arithmetic when you need versioned JSON evidence of the freshness decision.
Side effects
- Missing or invalid 'age' string (non-numeric or empty) may produce an advisory/error status
- Missing 'max_age_seconds' integer causes inability to compute freshness comparison
- Malformed Age header strings (e.g. negative values, non-integer strings) may result in an advisory rather than pass status
- Extremely large integer values for max_age_seconds may be clamped or flagged
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| age | string | Age supplied to Age Header Validate; used only for this bounded calculation and processed in memory without retention. |
| max_age_seconds | integer | Max Age Seconds supplied to Age Header Validate; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"age_seconds": 120,
"within_freshness": true
},
"schema": "delx/util-age-header-validate/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "f51799fd712f3514d51db5985cf250b2e699f3081571f017224fd7838e380cc7",
"external_calls": 0
},
"operation": "web_reliability:age_header_validate"
}
}Tags
x402
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