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JSON Array Index By Key
x402
JSON Array Index 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).
Indexes an array of JSON objects by a specified top-level key, returning a keyed map with duplicate detection and counts
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Array Index By Key: JSON Array Index By Key indexes object rows by a unique top-level key and reports duplicates from bounded caller-supplied values without an external provider. Call JSON Array Index 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 Index By Key as versioned deterministic JSON. Pri…
Output
Returns a versioned deterministic JSON object containing: a map of objects keyed by the specified field, duplicate key counts and which entries collided, normalized values, and metadata including a versioned result contract. The transformation is computed in-memory with no data retention.
Example use cases
Pre-flight dedup check before DB upsert
“Before I write these 150 user records to the database, index them by 'user_id' and flag any duplicates so I don't get constraint violations.”
Build lookup table from API batch response
“I've got an array of order objects from the orders API — can you index them all by 'order_id' so I can do fast lookups instead of scanning the whole list every time?”
Validate uniqueness before downstream tool handoff
“I'm about to pass this batch of config entries to the deployment tool, but it needs them keyed by 'config_name' with no duplicates — can you reindex them and tell me if anything collides?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-array-index-by-keyWhen to prefer
Use this endpoint when you need to convert a flat JSON array into a keyed lookup map before handing data to a downstream tool that requires a dictionary structure, or when you need to detect and report duplicate keys in a bounded dataset. It is deterministic, stateless, and cheap ($0.001 USDC) making it ideal as a preprocessing step in agentic pipelines. Prefer it over custom agent-side code when you want a versioned, auditable transformation contract rather than an ad-hoc implementation.
Side effects
- Key field not present in all objects — returns error or partial index with missing-key report
- Duplicate items exceeding expected uniqueness — reported in duplicate count but not an error
- Input array exceeds 256 items — request rejected with validation error
- Key string exceeds 8192 characters — rejected with schema validation error
- Malformed JSON body — returns 400-level parse error
- Objects with more than 128 properties — rejected per schema constraint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| key | string | Key supplied to JSON Array Index By Key; used only for this bounded calculation and processed in memory without retention. |
| items | array | Items supplied to JSON Array Index By Key; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"index": {
"\"a\"": {
"id": "a",
"value": 1
},
"\"b\"": {
"id": "b",
"value": 2
}
},
"duplicate_keys": []
},
"schema": "delx/util-json-array-index-by-key/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "3ba5729409fe1785540d75284648b16e6e90027012b970c2a4b84dc9207b7c6b",
"external_calls": 0
},
"operation": "data_batch:json_array_index_by_key"
}
}Tags
x402
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