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JSON Array Group By Key
x402
JSON Array Group By Key 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).
Groups an array of JSON objects by a specified top-level key, returning counts and grouped results as deterministic versioned JSON.
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Array Group By Key: JSON Array Group By Key groups object rows by a selected top-level key from bounded caller-supplied values without an external provider. Call JSON Array Group By Key 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 Group By Key as versioned deterministic JSON. Price: $0.001 USDC via x4…
Output
A versioned deterministic JSON object containing the grouped data as a map from each unique key value to its array of matching records, along with per-group counts and normalized values. The response adheres to a versioned result contract for reproducibility.
Example use cases
Summarize orders by status
“I have a JSON array of 50 orders, each with a 'status' field that can be pending, shipped, or delivered — can you group them by status and tell me the count in each group?”
Partition user list by role
“Take this array of user objects and group them by the 'role' field so I can see how many admins, editors, and viewers I have.”
Bucket log events by severity
“Here's a batch of log entries as a JSON array — group them by the 'severity' key so I can see how many are info, warning, and error.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-array-group-by-keyWhen to prefer
Use this endpoint when an agent needs to group or partition a bounded in-memory JSON array by a known top-level key without setting up a database query or external aggregation service. Ideal for preprocessing structured data before handing it to a downstream tool with a stricter contract, or when you need deterministic versioned output for reproducibility. Best for arrays up to 256 objects with up to 128 properties each.
Side effects
- Key not found at top level of objects — returns empty groups or error indicating missing key
- Array exceeds 256 items limit — request rejected
- Object in array exceeds 128 properties limit — request rejected
- Key string exceeds 8192 character limit — request rejected
- Malformed JSON input — parsing error returned
- Payment failure via x402 — 402 response before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| key | string | Key supplied to JSON Array Group By Key; used only for this bounded calculation and processed in memory without retention. |
| items | array | Items supplied to JSON Array Group By Key; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"groups": [
{
"items": [
{
"id": 1,
"team": "a"
},
{
"id": 3,
"team": "a"
}
],
"value": "a"
},
{
"items": [
{
"id": 2,
"team": "b"
}
],
"value": "b"
}
],
"group_count": 2
},
"schema": "delx/util-json-array-group-by-key/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "e13f35d5b81a3f1808078d9bbb061844639be95ac142b8481906eb21ac179980",
"external_calls": 0
},
"operation": "data_batch:json_array_group_by_key"
}
}Tags
x402
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