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ONE Engine Object Size
x402
ONE Engine Object Size is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0009/call, status unknown (last checked 2026-10-02).
Returns the number of properties (keys) in a given JSON object.
Price / call$0.0009
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 `count` field containing the integer number of top-level properties in the submitted object (e.g. {"count": 2}).
Example use cases
Validate incoming API payload size
“Check how many fields are in this API response object before I process it — I want to make sure it has at least 5 properties: {"id":1,"name":"Test","status":"active","created":"2024-01-01","type":"user"}.”
Dynamic form field count check
“I have a user-submitted form object and I need to know how many fields they filled in — can you count the properties in this object: {"firstName":"Bob","email":"bob@example.com","phone":"555-1234"}?”
Agent memory slot counting
“My agent state object keeps growing — can you tell me how many keys are currently in this state blob so I know if I'm approaching my limit: {"task":"search","step":3,"result":"done","context":"sales","user":"alice","timestamp":"now"}?”
Technical details
Endpoint
POSThttps://one-search.one-engine.workers.dev/v1/object/size?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap, single-call utility to count the number of top-level keys in a JSON object without running local code. Ideal for AI agents that need lightweight introspection of dynamic payloads without spinning up a code execution environment. At $0.0009 USDC per call, it is cost-effective for high-frequency agent workflows.
Side effects
- Non-object input (e.g. array or primitive) may return an unexpected count or error
- Missing or malformed `value` field in the request body may result in a 400 error
- Empty object returns count of 0, which is valid but may be unexpected
- Network or payment failure (x402) results in a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| value | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 2
}
}Tags
x402
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