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Last Modified Compare
x402
Last Modified Compare is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-15).
Compares two Last-Modified HTTP timestamps (as Unix epochs) and computes their delta against caller-supplied bounds, returning a pass/advisory status with normalized evidence.
Price / call$0.001
Success—
StatusUnknown
How this service works
Last Modified Compare: Last Modified Compare orders two Last-Modified instants and reports their delta from bounded caller-supplied values without an external provider. Call Last Modified Compare 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 Last Modified Compare as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memo…
Output
Returns a versioned deterministic JSON object containing: normalized Last-Modified evidence extracted from the inputs, the computed delta between the two epochs, and an explicit pass or advisory status indicating whether the timestamps satisfy the bounded comparison criteria.
Example use cases
Cache freshness check before storing
“Before I cache this web response, compare its Last-Modified times: the before epoch is 1699900000 and the after epoch is 1700000000 — is the delta within acceptable bounds and should I proceed?”
Redirect safety validation
“I'm about to follow a redirect — can you compare the Last-Modified instants before_epoch 1698000000 and after_epoch 1698050000 and tell me if the modification ordering passes or raises an advisory?”
Retry decision based on modification delta
“I got a response I'm considering retrying — check whether the Last-Modified timestamps make sense: before_epoch is 1701000000 and after_epoch is 1701003600, and let me know the computed delta and verdict.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/last-modified-compare?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs a deterministic, stateless verdict on whether two Last-Modified HTTP timestamps are correctly ordered and within acceptable delta bounds — particularly before caching, accepting, redirecting, or retrying a web response. Prefer it over manual timestamp arithmetic when you need a normalized, auditable JSON result with an explicit pass/advisory classification rather than raw computation.
Side effects
- Missing or invalid after_epoch or before_epoch integers — request rejected or malformed response
- after_epoch earlier than before_epoch — may return advisory status rather than pass
- Epochs outside plausible Unix timestamp range — validation may flag as anomalous
- Payment failure via x402 protocol — endpoint returns 402 before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| after_epoch | integer | After Epoch supplied to Last Modified Compare; used only for this bounded calculation and processed in memory without retention. |
| before_epoch | integer | Before Epoch supplied to Last Modified Compare; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"direction": "newer",
"delta_seconds": 120
},
"schema": "delx/util-last-modified-compare/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "3af22a08d2240acef2720f15dceafc3801c8b2b7dffd60a82da13e82ad1839fb",
"external_calls": 0
},
"operation": "web_reliability:last_modified_compare"
}
}Tags
x402
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