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ONE Engine Array Flatten
x402
ONE Engine Array Flatten 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).
Flattens a nested JSON array into a single-level array, with optional size and offset parameters.
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 flattened (single-level) version of the input array, along with any metadata from the operation. The flattened array has all nested sub-arrays unwound into a single sequential list, optionally trimmed by size and starting at offset.
Example use cases
Normalize nested API response data
“I got back a deeply nested array from another API — [["a",["b","c"]],["d"]] — can you flatten it into a simple one-level list so I can iterate over the items?”
Paginate through flattened results
“I have this nested array [[1,2,3],[4,[5,6]],7,8,9,10] and I want just 5 items starting at offset 3 after flattening — can you do that for me?”
Compare flattened array against reference
“Take this nested array [["apple",["banana","cherry"]],"date"] and flatten it, then compare it against ["apple","banana","cherry","date"] so I can see if they match up.”
Technical details
Endpoint
POSThttps://one-search.one-engine.workers.dev/v3/array/flatten/t9?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a simple, low-cost, pay-per-call utility to flatten nested JSON arrays without standing up your own transformation logic. Ideal for AI agents that occasionally need to normalize nested data structures from external APIs, especially when operating in a crypto-native x402 payment context on Base. Not suitable for very large arrays exceeding 1000 items.
Side effects
- Input array exceeds 1000 items — request will be rejected
- Malformed JSON in the values field — will return a parse error
- Invalid offset or size values (negative integers or non-integer types) — validation error
- Payment failure via x402 on Base — 402 response before processing begins
- Empty values array — may return empty result or error depending on server handling
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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