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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, $0.0005/call, status unknown (last checked 2026-10-20).
Returns the set difference between two arrays, yielding elements in the first array that are not present in the second (comparison) array.
Price / call$0.0005
Success—
StatusUnknown
How this service works
Low-cost pay-per-call utility APIs for autonomous agents using x402 on Base.
Output
A JSON object containing an array of elements that appear in the primary `values` array but not in the `other` comparison array, representing the set-theoretic difference A \ B.
Example use cases
Detect missing user IDs
“I have a list of user IDs who signed up this month and another list of users who completed onboarding — can you find which signed-up users have NOT completed onboarding yet? Here are the two arrays: signups = [1,2,3,4,5,6] and onboarded = [2,4,6].”
Find unassigned tasks
“I have a full task list ["task-A","task-B","task-C","task-D"] and a list of tasks already assigned to someone ["task-B","task-D"]. Which tasks from my full list are still unassigned?”
Identify new inventory items
“Compare my current inventory list ["sku-001","sku-002","sku-003","sku-007"] against yesterday's list ["sku-001","sku-002","sku-003"] and tell me which SKUs are new additions.”
Technical details
Endpoint
POSThttps://one-search.one-engine.workers.dev/v3/array/difference/t1?utm_source=zero.xyzWhen to prefer
Use this endpoint when an autonomous agent needs a fast, cheap, stateless computation to find the set difference between two arrays without spinning up local logic. Ideal for agentic pipelines on Base that already use x402 micropayments, where the per-call cost ($0.0005 USDC) is negligible and offloading array math keeps agent code simple. Prefer this over local computation when working in constrained runtime environments or when the operation needs to be auditable as a paid API call.
Side effects
- Array exceeds 1000 items — request rejected
- Malformed JSON array in `values` or `other` — validation error
- Missing required `values` field — 400 Bad Request
- Payment not included or insufficient — 402 Payment Required
- Cloudflare Worker cold start or timeout — 503 or timeout 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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