Delx Commerce — Accept Header Rank

x402

Delx Commerce — Accept Header Rank is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).

Ranks a list of MIME type offers against an HTTP Accept header and returns the best match according to quality weighting

Price / call$0.001

Seller volume →—

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 ranked array of offers each with their computed quality score, the single selected best-match offer, an operation identifier, a status of 'pass', and an evidence object including whether input was retained (always false), the SHA-256 hash of the input for verifiability, and the count of external calls made (always 0).

Example use cases

API response format selection

“I have an Accept header from a client: 'application/json;q=1.0,text/xml;q=0.8,text/plain;q=0.5' — and my API can serve ['application/json','text/xml','text/plain']. Which format should I respond with and in what priority order?”

Browser request content negotiation

“A browser sent me this Accept header: 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8' — rank my available types ['text/html','application/json','application/xml','image/webp'] by preference so I serve the right one.”

Validating content negotiation logic

“I want to double-check my server's content negotiation — take this Accept header 'application/msgpack;q=0.9,application/json;q=0.8' and rank the offers ['application/json','application/msgpack','text/plain'] to confirm which one wins.”

Technical details

Endpoint

POSThttps://commerce.delx.ai/api/v1/x402/accept-header-rank?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a standards-compliant, verifiable, stateless computation of HTTP Accept header content negotiation — particularly in agent pipelines where auditability matters (evidenced by input hash and zero external calls guarantee). Prefer it over rolling your own parser when you need a pay-per-use, no-signup solution with cryptographic proof of non-retention. Ideal for agents that dynamically select response formats or validate their own content negotiation logic.

Side effects

Malformed Accept header string may produce unexpected rankings or errors
Empty offers array results in no selection
Offers exceeding 256 items are rejected by schema validation
Header string exceeding 8192 characters rejected
Payment failure via x402 protocol blocks the request
Wildcard MIME types (*/*) may need careful interpretation in the ranked output

Input

Schema · Request body

Field	Type	Description
header	string	Header supplied to Accept Header Rank; used only for this bounded calculation and processed in memory without retention.
offers	array	Offers supplied to Accept Header Rank; used only for this bounded calculation and processed in memory without retention.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "result": {
      "ranked": [
        {
          "offer": "application/json",
          "quality": 1
        },
        {
          "offer": "text/plain",
          "quality": 0.5
        }
      ],
      "selected": "application/json"
    },
    "schema": "delx/util-accept-header-rank/v1",
    "status": "pass",
    "evidence": {
      "retained": false,
      "input_sha256": "6f60834b6ddd258ebac619ec48677f1ee272c525d95ebcd2374e0b3d4e7daba8",
      "external_calls": 0
    },
    "operation": "web_reliability:accept_header_rank"
  }
}

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