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Delx Commerce — Vary Header Normalize
x402
Delx Commerce — Vary Header Normalize 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).
Parses and normalizes an HTTP Vary header string into a canonical, sorted list of header field tokens
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 containing: a list of normalized, lowercased header tokens (e.g. ['accept-encoding','origin']), a normalized comma-joined string, a status of 'pass', an operation identifier, and a verifiable evidence block including whether input was retained (always false), the SHA-256 hash of the input, and the count of external calls made (always 0).
Example use cases
CDN cache key normalization
“I'm configuring a CDN and need to normalize this Vary header before storing it: 'Accept-Encoding, Origin, Accept-Language' — can you parse it into canonical tokens?”
HTTP response validation pipeline
“Before we forward this HTTP response, normalize the Vary header 'origin,accept-encoding' so we have a consistent lowercase token list to compare against our policy rules.”
Debugging inconsistent cache behavior
“We're seeing inconsistent cache hits and suspect the Vary header is malformed — can you normalize 'Accept-Encoding , Origin, Accept' and tell me what tokens it actually contains?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/vary-header-normalize?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a deterministic, verifiable, privacy-preserving normalization of HTTP Vary headers — especially in automated pipelines where auditability matters (the SHA-256 evidence hash confirms the input processed). Prefer this over ad-hoc string splitting when you need consistent canonical output with no data retention guarantees and a pay-per-call model with no signup friction.
Side effects
- Input header string exceeds 8192 character limit — request rejected
- Malformed or unparseable header content — may return empty token list or error status
- Payment failure or insufficient USDC balance — 402 response before processing
- Network timeout — no result returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| header | string | Header supplied to Vary Header Normalize; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"tokens": [
"accept-encoding",
"origin"
],
"normalized": "accept-encoding, origin"
},
"schema": "delx/util-vary-header-normalize/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "939169b314b2600276b55d910c792908209d28331261b7f22bab533cf1e6cd07",
"external_calls": 0
},
"operation": "web_reliability:vary_header_normalize"
}
}Tags
x402
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