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JSON Key Allowlist
x402
JSON Key Allowlist 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 a JSON object's top-level keys against a caller-supplied allowlist, returning counts and details of any disallowed keys found.
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Key Allowlist: JSON Key Allowlist finds top-level object keys outside an explicit allowlist from bounded caller-supplied values without an external provider. Call JSON Key Allowlist 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 Allowlist as versioned deterministic JSON. Price: $0.001 USDC via x402 on Bas…
Output
Returns a versioned deterministic JSON result containing the count of disallowed keys found, the specific disallowed key names, normalized values, and a versioned result contract. All processing is done in memory without data retention.
Example use cases
Guard downstream tool input
“I'm about to hand this structured plan object to a fulfillment API that only accepts 'sku', 'quantity', and 'warehouse' as top-level keys — can you check the object against that allowlist and tell me if anything is outside the contract?”
Catch LLM hallucinated fields
“The AI just produced this JSON result, but our downstream system only allows 'id', 'status', 'timestamp', and 'payload' — validate those top-level keys and flag anything extra before I forward it.”
Enforce schema in agent pipeline
“Before the orchestrator hands this batch plan to the execution agent, verify the top-level keys are strictly within ['task', 'priority', 'deadline', 'assignee'] and return a count of any disallowed ones.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-key-allowlistWhen to prefer
Use this endpoint when an agent needs to enforce a strict top-level key contract on a JSON object before passing it to a downstream tool, API, or execution layer that rejects unexpected fields. Prefer this over manual key inspection when you need a versioned, deterministic, auditable result with counts and normalized values rather than a simple boolean. Especially valuable in multi-agent pipelines where LLM-generated structured outputs may contain hallucinated or extra keys.
Side effects
- Object exceeds 128 top-level property limit — request rejected
- Allowlist exceeds 256 items — request rejected
- Individual allowlist string exceeds 8192 characters — request rejected
- Malformed input JSON — validation error returned
- Payment not included or insufficient — 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| object | object | Object supplied to JSON Key Allowlist; used only for this bounded calculation and processed in memory without retention. |
| allowed | array | Allowed supplied to JSON Key Allowlist; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"passed": true,
"unexpected_keys": []
},
"schema": "delx/util-json-key-allowlist/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "8db5924d2566b60a20ce9bbc77d50f76ea1135a98e526ba746e027da4b772dda",
"external_calls": 0
},
"operation": "data_batch:json_key_allowlist"
}
}Tags
x402
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