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X402 Delivery Content Type Check
x402
X402 Delivery Content Type Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Validates whether an x402 delivery's content type matches the buyer's accepted media types, returning acceptance/rejection status with mismatch reasons
Price / call$0.001
Success—
StatusUnknown
How this service works
X402 Delivery Content Type Check: X402 Delivery Content Type Check compares delivery content type with buyer-accepted media types from bounded caller-supplied values without an external provider. Call X402 Delivery Content Type Check before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Delivery Content…
Output
Returns a structured result including an explicit acceptance or rejection status, normalized evidence of the content type comparison, contract-specific validation checks, and human-readable mismatch reasons explaining why the content type was accepted or rejected.
Example use cases
Pre-payment x402 content type guard
“I'm about to pay for an x402 delivery that claims to return 'text/html', but I only accept 'application/json' and 'application/ld+json' — check whether the content type matches my accepted list and tell me if I should reject it before paying.”
Agent delivery validation pipeline
“My agent just received a delivery with content type 'image/png' and my accepted types are ['application/json', 'text/csv']. Run a content type check so I know whether to accept or reject this before processing the result.”
Automated x402 gating in multi-step workflow
“In my automated x402 workflow, check if the delivery content type 'application/pdf' is compatible with my accepted types ['application/pdf', 'application/octet-stream'] — return whether it passes and any mismatch reasons so the workflow can decide to proceed or abort.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/x402-delivery-content-type-checkWhen to prefer
Use this endpoint specifically when operating in an x402 or agent delivery context where you need to validate a delivery's content type against a buyer-specified list of accepted media types before committing to payment or processing. Prefer this over manual string matching when you need normalized evidence, structured mismatch reasons, and an explicit contract-level accept/reject decision. It is lightweight ($0.001 USDC) and stateless, making it suitable for inline pre-payment validation steps in automated agent workflows.
Side effects
- Missing or empty content_type field causes check to fail with no meaningful result
- Empty accepted array may result in automatic rejection of any content type
- Malformed MIME type strings may cause parsing errors or unexpected match behavior
- Overly broad wildcard accepted types (e.g. '*/*') may accept unintended content types
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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