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CSV Duplicate Key Check
x402
CSV Duplicate Key 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 in CSV data rows using caller-supplied column names, returning counts and normalized findings as versioned deterministic JSON.
Price / call$0.001
Success—
StatusUnknown
How this service works
CSV Duplicate Key Check: CSV Duplicate Key Check finds duplicate composite keys in CSV rows from bounded caller-supplied values without an external provider. Call CSV Duplicate Key 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 CSV Duplicate Key Check as versioned deterministic JSON. Price: $0.001 USDC via x402 o…
Output
Returns versioned deterministic JSON containing duplicate composite key findings, including counts of occurrences per duplicate key combination, normalized key values, and a versioned result contract indicating whether duplicates were found and their details.
Example use cases
Pre-import database uniqueness check
“Before I load this CSV into the database, scan it for any rows that share the same 'customer_id' and 'invoice_number' — I need to know if there are duplicate composite keys that would violate my unique constraint.”
ETL pipeline data quality gate
“Run a duplicate key check on this CSV using the columns 'date' and 'store_code' as the composite key — flag any duplicates with their counts so I know if the pipeline data is clean before the next stage.”
Batch plan validation before downstream tool
“I'm about to hand this structured CSV batch off to a payment processor. Can you check it first for any duplicate 'transaction_id' and 'account_id' key combinations and show me how many times each duplicate appears?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/csv-duplicate-key-checkWhen to prefer
Use this endpoint when an agent needs to validate CSV uniqueness constraints on composite keys before handing structured data to a downstream system with strict deduplication requirements. Prefer this over manual row comparison when the CSV is bounded in size (under 8192 chars), no external database or service is available, and a deterministic versioned result is needed for audit or contract purposes.
Side effects
- CSV text exceeds 8192 character limit — request rejected
- key_columns references column names not present in the CSV header — returns empty or error finding
- Malformed CSV (unquoted commas, inconsistent columns) may cause incorrect row parsing
- Empty CSV or CSV with only a header row returns zero duplicates with no error
- key_columns array is empty — behavior undefined or returns trivial result
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Text supplied to CSV Duplicate Key Check; used only for this bounded calculation and processed in memory without retention. |
| key_columns | array | Key Columns supplied to CSV Duplicate Key Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"unique": false,
"duplicate_rows": [
3
]
},
"schema": "delx/util-csv-duplicate-key-check/v1",
"status": "advisory",
"evidence": {
"retained": false,
"input_sha256": "9046a42812db7833761b9aee29de477ebae24f4c8ae2087d757d328905d6db58",
"external_calls": 0
},
"operation": "data_batch:csv_duplicate_key_check"
}
}Tags
x402
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