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Delx Commerce — Expires Header Validate
x402
Delx Commerce — Expires Header Validate is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Validates an HTTP Expires header by computing whether a given expiry epoch is non-negative and calculating the lifetime in seconds relative to a reference date epoch.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object with: a 'result' object containing 'non_negative' (boolean) and 'lifetime_seconds' (integer); a 'status' field ('pass'/'fail'); an 'evidence' object with 'retained' (false), 'input_sha256' hash of inputs, and 'external_calls' count (0); plus schema and operation identifiers. Processing is in-memory with no data retention.
Example use cases
Cache header audit in agent pipeline
“I have an HTTP response where the date epoch is 1699999800 and the expires epoch is 1700000100 — can you validate the Expires header and tell me the lifetime in seconds and whether it's non-negative?”
Web reliability check before resource fetch
“Before my agent fetches this resource, I need to verify the Expires header is valid: date epoch 1700100000, expires epoch 1700100600. Is the expiry non-negative and what's the lifetime?”
Debugging stale cache headers
“I'm seeing unexpected caching behavior — the date epoch is 1700050000 and the expires epoch is 1700049000, which seems wrong. Can you validate the Expires header and tell me if it's non-negative and what the lifetime comes out to?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/expires-header-validate?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs a verifiable, auditable validation of an HTTP Expires header with cryptographic evidence of the inputs processed (SHA-256 hash) and a guarantee of no data retention or external calls. Prefer it over manual time arithmetic when you need a pay-per-result, trustless computation result in an agent pipeline handling web caching or reliability checks.
Side effects
- Missing or invalid date_epoch or expires_epoch integers — likely returns a validation error or non-pass status
- Malformed request body — likely returns a 400-level HTTP error
- Payment failure via x402 protocol — request not processed if USDC payment is not completed
- Negative lifetime (expires before date) — returns non_negative: false with a negative or zero lifetime_seconds
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| date_epoch | integer | Date Epoch supplied to Expires Header Validate; used only for this bounded calculation and processed in memory without retention. |
| expires_epoch | integer | Expires Epoch supplied to Expires Header Validate; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"non_negative": true,
"lifetime_seconds": 300
},
"schema": "delx/util-expires-header-validate/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "ffaeb927a9888a663105db7e7acc72e617fcdb3b01fc28c069de689945d7f1ce",
"external_calls": 0
},
"operation": "web_reliability:expires_header_validate"
}
}Tags
x402
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