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ONE Engine Array Difference
x402
ONE Engine Array Difference is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.018/call, status unknown (last checked 2026-10-02).
Computes the set difference between two arrays, returning elements in the primary array that are not present in the comparison array.
Price / call$0.018
Success—
StatusUnknown
How this service works
Low-cost pay-per-call utility APIs for autonomous agents using x402 on Base.
Output
Returns a JSON object containing the array of elements that appear in the primary `values` array but not in the `other` comparison array — effectively the set difference A minus B. May also include metadata about the result size or offset depending on the parameters provided.
Example use cases
Filter out already-processed IDs
“I have a list of all user IDs from today's batch and a list of IDs we already processed yesterday. Can you give me only the ones we haven't handled yet? Today's list: [101, 102, 103, 104, 105], already processed: [102, 104].”
Find missing product SKUs
“Here are the SKUs we have in our warehouse inventory: ['SKU001','SKU002','SKU003','SKU004'] and here are the SKUs listed in our catalog: ['SKU002','SKU004','SKU005','SKU006']. Which SKUs are in the warehouse but not in the catalog?”
Identify new subscribers since last export
“I exported subscriber emails last week and now I have a fresh list. Can you tell me which emails are in the new list but weren't in the old one? New list: ['a@x.com','b@x.com','c@x.com'], old list: ['a@x.com','b@x.com'].”
Technical details
Endpoint
POSThttps://one-search.one-engine.workers.dev/v3/array/difference/t9?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, low-cost, pay-per-call set difference computation without standing up your own infrastructure. It's ideal for autonomous agents that occasionally need to diff small-to-medium arrays (up to 1000 items) on the fly without a persistent backend. Prefer this over rolling your own logic when operating in a cost-sensitive, stateless agent pipeline using x402 micropayments on Base.
Side effects
- Input array exceeds 1000-item limit — request rejected
- Missing required `values` field — returns validation error
- Non-array value passed where array is expected — schema error
- Payment not provided or insufficient — 402 Payment Required response
- Network timeout on Cloudflare Worker — transient 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| size | integer | |
| other | array | Optional comparison array |
| offset | integer | |
| valuesrequired | array | JSON array with at most 1000 items |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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