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JSON Array Filter Keys
x402
JSON Array Filter Keys 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).
Filters rows in a JSON object array, keeping only objects whose specified key matches one of a set of allowed values
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Array Filter Keys: JSON Array Filter Keys keeps object rows whose selected key matches caller values from bounded caller-supplied values without an external provider. Call JSON Array Filter Keys 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 Array Filter Keys as versioned deterministic JSON. Price: $0.001 USD…
Output
Returns a versioned deterministic JSON object containing the filtered array (only rows whose specified key matched an allowed value), row counts for total input and matched output, normalized values, and a versioned result contract for downstream compatibility.
Example use cases
Filter pipeline data by category
“I have a batch of transaction records and I only want to keep the ones where the 'type' field is either 'deposit' or 'withdrawal' — can you filter out everything else?”
Whitelist product statuses before handoff
“Before I send this product catalog to the fulfillment API, filter the array to only include items where 'availability' is 'in_stock' or 'preorder' — drop anything else.”
Narrow user records by role
“Here's a list of user objects; I need only the rows where 'role' equals 'admin' or 'moderator' — can you give me back just those?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-array-filter-keysWhen to prefer
Use this endpoint when an agent needs a deterministic, in-memory, stateless key-based whitelist filter on a JSON object array before passing structured data to a downstream tool with a stricter schema contract. Prefer it over general-purpose code execution when you need a versioned, reproducible result with counts and no side effects, and when the dataset fits within 256 rows.
Side effects
- Key not found in any object — returns empty filtered array with zero match count
- Items array exceeds 256 objects — request rejected with validation error
- Allowed list exceeds 256 entries — request rejected
- Key string exceeds 8192 characters — request rejected
- Malformed input JSON — returns schema validation error
- Empty allowed list — returns empty array
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| key | string | Key supplied to JSON Array Filter Keys; used only for this bounded calculation and processed in memory without retention. |
| items | array | Items supplied to JSON Array Filter Keys; used only for this bounded calculation and processed in memory without retention. |
| allowed | array | Allowed supplied to JSON Array Filter Keys; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"items": [
{
"id": 1,
"status": "ok"
}
],
"matched_count": 1
},
"schema": "delx/util-json-array-filter-keys/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "c1b64d403dd4df4223045c843cca745575ec8fc78aca3b171b5d12f60601eb75",
"external_calls": 0
},
"operation": "data_batch:json_array_filter_keys"
}
}Tags
x402
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