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ONE Engine Array Contains Check
x402
ONE Engine Array Contains Check is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Checks whether a given value exists within an array and returns the result along with the index of the match.
Price / call$0.001
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 with a boolean 'contains' field indicating whether the value was found in the array, and an 'index' integer indicating the position of the first match (or -1/null if not found).
Example use cases
Validate allowed user roles
“I have a list of permitted roles ['admin', 'editor', 'viewer'] — check if the role 'moderator' is in that list before granting access.”
Detect duplicate entry in queue
“I'm processing a job queue and need to know if job ID 'job-9821' is already in this list of active job IDs: ['job-1234', 'job-5678', 'job-9821', 'job-4321'].”
Feature flag membership check
“Can you check if the feature flag 'dark-mode' is included in the enabled flags list ['beta-ui', 'dark-mode', 'new-checkout'] and tell me its position?”
Technical details
Endpoint
POSThttps://one-search.one-engine.workers.dev/v1/array/contains?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, pay-per-call array membership check without spinning up any compute infrastructure. Ideal for AI agents that need to verify inclusion of a value in a list as part of a workflow and want a cheap ($0.001 USDC), real-time, stateless primitive accessible over HTTP with x402 micropayments on Base.
Side effects
- Missing 'value' or 'values' fields returns a validation error
- Non-array type for 'values' may cause a 400 error
- Payment failure via x402 protocol results in a 402 response blocking the call
- Empty array input may return contains: false with index: -1
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| value | — | |
| values | array |
Output
Schema · Response
{
"type": "json",
"example": {
"index": 1,
"contains": true
}
}Tags
x402
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