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Content Type Match
x402
Content Type Match 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).
Validates whether an actual HTTP Content-Type header value matches an expected media range, returning a deterministic pass/fail result.
Price / call$0.001
Success—
StatusUnknown
How this service works
Content Type Match: Content Type Match checks a concrete Content-Type against an expected media range from bounded caller-supplied values without an external provider. Call Content Type Match 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 Content Type Match as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memory-only…
Output
Returns a deterministic JSON object containing: the normalized actual and expected content-type values as web evidence, the computed match finding (whether actual satisfies the expected media range), and an explicit pass or advisory status — all versioned and stateless.
Example use cases
Validate API response before caching
“Before I cache this response, check whether the actual content-type 'application/json; charset=utf-8' matches my expected type 'application/json' — does it pass?”
Guard against wrong MIME type before redirect
“I'm about to follow a redirect — can you verify that the actual Content-Type 'application/octet-stream' matches my expected range 'application/octet-stream' so I know it's safe to proceed?”
Pre-flight check before accepting a file download
“Before my agent accepts this file download, check if the actual content-type 'image/png' matches the expected media range 'image/*' and give me a clear pass or fail.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/content-type-matchWhen to prefer
Choose this endpoint when you need a lightweight, deterministic, stateless check of whether an HTTP Content-Type value satisfies a given media range — particularly as a preflight guard before accepting, caching, redirecting, or retrying a web response. Prefer it over hand-coded string matching when you need normalized evidence and an explicit pass/advisory result returned as structured JSON. It is best suited for agentic pipelines that need verifiable, auditable content-type validation without side effects or external dependencies.
Side effects
- Malformed or unparseable Content-Type string in 'actual' field may yield an advisory/fail status rather than an error
- Expected media range that is syntactically invalid may cause a validation error
- Overly long input strings exceeding the 8192 character limit will be rejected
- Missing required fields ('actual' or 'expected') will cause a bad request error
- Payment failure via x402 will block the call before validation occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| actual | string | Actual supplied to Content Type Match; used only for this bounded calculation and processed in memory without retention. |
| expected | string | Expected supplied to Content Type Match; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"matched": true,
"expected_range": "application/*+json",
"actual_media_type": "application/problem+json"
},
"schema": "delx/util-content-type-match/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "b7c613a2c98fff13f2ac6da517851a23617d85340d45c743194249ef9f57070f",
"external_calls": 0
},
"operation": "web_reliability:content_type_match"
}
}Tags
x402
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