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JSON Key Denylist
x402
JSON Key Denylist is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates a JSON object by identifying and filtering top-level keys that appear in a caller-supplied denylist, returning counts and normalized findings.
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Key Denylist: JSON Key Denylist finds top-level object keys present in an explicit denylist from bounded caller-supplied values without an external provider. Call JSON Key Denylist before an agent hands structured data or a batch plan to a downstream tool with a stricter contract. Returns the bounded transformation or validation finding with counts, normalized values, and a versioned result contract for JSON Key Denylist as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base.…
Output
A versioned deterministic JSON response containing: the count of denied keys found, the list of matched (denied) keys, normalized values, and a versioned result contract indicating which keys from the input object matched the supplied denylist.
Example use cases
Pre-flight check before strict API call
“I'm about to send this JSON payload to a partner API that rejects requests with certain keys. Can you check the object against this denylist — ['debug', 'trace', 'internal', 'dev_mode'] — and tell me if any of those keys are present before I submit?”
Enforce data policy on agent output
“My agent just generated a structured result object and I need to make sure it doesn't include any of these restricted keys before logging it: ['user_email', 'ssn', 'credit_card', 'dob']. Can you run the denylist check and give me the count of violations?”
Sanitize batch plan before handoff
“Before handing off this batch plan object to the fulfillment tool, scan it for any of these prohibited top-level keys: ['override', 'bypass', 'admin', 'root', 'superuser'] — I need to know exactly which ones triggered and a clean summary.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-key-denylistWhen to prefer
Use this endpoint when an agent needs a lightweight, in-memory, stateless key-denylist check on a JSON object before passing it to a downstream tool with a stricter contract, and when no external provider or persistent storage should be involved. Prefer this over custom validation logic when you need a versioned, deterministic result with counts and normalized output for auditability.
Side effects
- Denylist array exceeds 256 items — request rejected
- Input object exceeds 128 top-level properties — request rejected
- Individual denylist string exceeds 8192 characters — request rejected
- Malformed JSON body — parse error returned
- Payment not attached or insufficient USDC — 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| denied | array | Denied supplied to JSON Key Denylist; used only for this bounded calculation and processed in memory without retention. |
| object | object | Object supplied to JSON Key Denylist; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"passed": false,
"denied_keys": [
"password"
]
},
"schema": "delx/util-json-key-denylist/v1",
"status": "advisory",
"evidence": {
"retained": false,
"input_sha256": "e2140fb14617296830e26895419ba5db41e0d9b605a101ae52d4dc0f016e86e2",
"external_calls": 0
},
"operation": "data_batch:json_key_denylist"
}
}Tags
x402
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