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JSON Unique Fields Check
x402
JSON Unique Fields Check 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).
Detects duplicate composite keys across an array of JSON objects based on a caller-specified set of field names
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Unique Fields Check: JSON Unique Fields Check finds duplicate composite keys across object rows from bounded caller-supplied values without an external provider. Call JSON Unique Fields Check 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 Unique Fields Check as versioned deterministic JSON. Price: $0.001 USDC…
Output
Returns a versioned deterministic JSON result containing: counts of duplicate composite key occurrences, the normalized values of the duplicate keys found, an indication of which rows are affected, and a versioned result contract — all computed in-memory without data retention.
Example use cases
Pre-insert uniqueness guard for database
“Before I insert these 200 product rows into the catalog, check if any of them share the same combination of 'sku' and 'warehouse_id' — flag the duplicates so I can clean them up first.”
Deduplication check for ETL pipeline
“I'm about to run an ETL job on this JSON batch. Can you check if any records have duplicate composite keys on 'customer_id' and 'order_date'? I need a count of duplicates and which values repeat.”
Schema contract validation before API handoff
“I have a list of event objects I need to send to a downstream API that requires unique combinations of 'event_type' and 'timestamp'. Check if there are any duplicates across those two fields before I hand the data off.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-unique-fields-checkWhen to prefer
Use this endpoint when you need a lightweight, stateless, pay-per-call composite key uniqueness check on a bounded JSON array without standing up a database or external deduplication service. It is ideal as a pre-flight validation step before handing structured data to a downstream tool with strict uniqueness contracts. Prefer it over full ETL deduplication pipelines when your dataset is small (≤256 rows) and you need a deterministic, versioned result immediately.
Side effects
- Items array exceeds 256 elements — request will be rejected or truncated
- More than 128 properties per object — exceeds maxProperties limit
- Field names reference keys that don't exist in the objects — may return no duplicates or empty results
- Malformed JSON in items — request will fail with a parse error
- Empty items array or empty fields array — returns no findings
- Fields array exceeds 256 entries — request rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| items | array | Items supplied to JSON Unique Fields Check; used only for this bounded calculation and processed in memory without retention. |
| fields | array | Fields supplied to JSON Unique Fields Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"unique": true,
"duplicate_indices": []
},
"schema": "delx/util-json-unique-fields-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "9add83ab55b011d3994b700af703d6cc08072afb22cf6873ea05add8e1af633e",
"external_calls": 0
},
"operation": "data_batch:json_unique_fields_check"
}
}Tags
x402
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