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Delx Commerce — X402 Delivery Content-Type Check
x402
Delx Commerce — X402 Delivery Content-Type Check 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).
Validates whether a given HTTP Content-Type header value matches a list of accepted content types, returning a verifiable pass/fail result with cryptographic evidence.
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 boolean 'accepted' field indicating whether the content type matched, the matched 'content_type' string, an overall 'status' (pass/fail), an 'operation' identifier, and an 'evidence' block containing a SHA-256 hash of the input, a 'retained: false' flag confirming no data is stored, and a count of external calls made (always 0).
Example use cases
Validate API response content type
“Before I process this API response, check if its Content-Type 'application/json' is in my accepted list ['application/json', 'application/ld+json'] and give me a verifiable result.”
x402 delivery compliance audit
“I'm building an x402 payment flow and need to verify that the delivered content type 'text/html' matches my accepted types ['application/pdf', 'application/json'] — run the check and return evidence I can audit.”
Content negotiation gate for agent pipeline
“My agent is about to consume a resource with content type 'image/png' — quickly validate whether that's in my allowed list ['application/json', 'text/csv'] before I proceed.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/x402-delivery-content-type-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a cryptographically verifiable, auditable content-type validation with provable non-retention of input data — especially in x402 payment-gated agent pipelines where you need tamper-evident evidence of the check. Prefer this over a simple local string comparison when auditability, evidence hashes, or pay-per-use billing transparency matter.
Side effects
- Invalid or missing 'content_type' field returns a validation error
- 'accepted' array exceeding 256 items is rejected
- Content-type strings exceeding 8192 characters are rejected
- Malformed JSON body returns a 400-level error
- Payment failure via x402 protocol prevents execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| accepted | array | Accepted supplied to X402 Delivery Content Type Check; used only for this bounded calculation and processed in memory without retention. |
| content_type | string | Content Type supplied to X402 Delivery Content Type Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"accepted": true,
"content_type": "application/json"
},
"schema": "delx/util-x402-delivery-content-type-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "17d22f796e7932f46bbb49530f843fcbb42e7bea6267a2306a495865b24fc926",
"external_calls": 0
},
"operation": "delivery_contract:x402_delivery_content_type_check"
}
}Tags
x402
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