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Accept Language Rank
x402
Accept Language Rank 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).
Ranks a list of offered languages against a weighted Accept-Language HTTP header to determine the best language match for a web response.
Price / call$0.001
Success—
StatusUnknown
How this service works
Accept Language Rank: Accept Language Rank ranks offered languages against weighted Accept-Language ranges from bounded caller-supplied values without an external provider. Call Accept Language Rank 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 Accept Language Rank as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, me…
Output
Returns a versioned deterministic JSON object containing: the normalized Accept-Language evidence parsed from the header, the computed ranking of offered languages against the weighted ranges, the top-matching language, and an explicit pass or advisory status indicating whether a confident match was found.
Example use cases
Multilingual CDN cache key selection
“Before I cache this response, rank my offered languages ['en', 'es', 'pt-BR'] against the incoming Accept-Language header 'pt;q=1.0, es;q=0.8, en;q=0.3' so I serve and cache the right locale.”
API gateway language redirect routing
“I need to redirect this user to the right localized subdomain — my available languages are ['en-GB', 'fr-FR', 'zh-CN'] and their Accept-Language header is 'zh-Hans;q=1.0, fr;q=0.6'. Which should I redirect them to?”
Server-side rendering locale selection
“Before rendering, rank ['en', 'ja', 'ko'] against the Accept-Language header 'ja-JP;q=1.0, ko;q=0.5, en;q=0.2' and tell me which locale to use for server-side rendering this page.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/accept-language-rankWhen to prefer
Choose this endpoint when you need deterministic, stateless, RFC-compliant language negotiation scoring without building your own parser — especially before caching, redirecting, or retrying a response where serving the wrong locale would be costly. Prefer it over rolling a custom solution when you need reproducible, versioned results and an explicit advisory flag for ambiguous cases.
Side effects
- Malformed Accept-Language header may produce an advisory/no-match status rather than a ranked result
- Empty offers array results in no match found
- Header exceeding 8192 characters is rejected
- Offers array exceeding 256 items is rejected
- Unrecognized or non-standard language tags may not match any weighted range
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| header | string | Header supplied to Accept Language Rank; used only for this bounded calculation and processed in memory without retention. |
| offers | array | Offers supplied to Accept Language Rank; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"ranked": [
{
"offer": "pt-BR",
"quality": 1
},
{
"offer": "en",
"quality": 0.7
},
{
"offer": "es",
"quality": 0.1
}
],
"selected": "pt-BR"
},
"schema": "delx/util-accept-language-rank/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "30f1c98209164e52a4430cbcc2c488f8df67d504f7b64f9f70e04e87dfc1bb24",
"external_calls": 0
},
"operation": "web_reliability:accept_language_rank"
}
}Tags
x402
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