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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, $0.0007/call, status unknown (last checked 2026-10-02).
Computes the difference between two arrays, returning elements present in the first array but not in the second.
Price / call$0.0007
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 are present in the primary `values` array but absent from the `other` comparison array, effectively the set difference A minus B. May include metadata about the result size or offset if those parameters were provided.
Example use cases
Deduplicating new items from existing inventory
“I have a list of incoming product IDs [101, 102, 103, 104, 105] and my existing inventory already contains [103, 104]. Which product IDs are new and not yet in inventory?”
Finding unprocessed records in a pipeline
“I have a batch of user IDs [200, 201, 202, 203, 204, 205] and the ones already processed are [201, 203, 205]. Which user IDs still need to be processed?”
Comparing permission sets for access control
“I have a list of required permissions ['read', 'write', 'delete', 'admin'] and a user has ['read', 'write']. What permissions does the user still lack?”
Technical details
Endpoint
POSThttps://one-search.one-engine.workers.dev/v3/array/difference/t2?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call set difference computation without spinning up local code, especially in autonomous agent pipelines running on Base that already use x402 micropayments. Ideal for quick one-off array diff operations on up to 1000 items where cost-per-call at $0.0007 USDC is acceptable. Prefer over custom code when the agent environment lacks a local runtime or when consistency and stateless execution are priorities.
Side effects
- Input array exceeds 1000 items — request rejected with validation error
- Missing required `values` field — returns 400-level error
- Payment not provided or insufficient — returns HTTP 402 requiring x402 USDC payment on Base
- Malformed JSON array input — parse error returned
- Network timeout on Cloudflare Workers edge — intermittent 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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