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Delx List Len
x402
Delx List Len is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Returns the length of a JSON array or a separator-delimited string list as a deterministic integer
Price / call$0.001
Success—
StatusUnknown
How this service works
Return length of a JSON array or separator-split string list — first-party local utility for agent preflight and proven micro-utils expansion. Returns deterministic machine-readable JSON for $0.001 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, no web search, no live RPC, and no mediagen. Results are advisory; the caller owns authorization, budgets, and production controls. Sibling of Delx routes that already co…
Output
Returns a deterministic JSON object containing the integer count of elements in the provided array or separator-split string. The response is machine-readable, stateless, and advisory — no data is retained after the call.
Example use cases
Preflight array size check
“Before I process this batch, can you tell me how many items are in this list: ["task1", "task2", "task3", "task4", "task5"]? I need to know if it's within my budget limit.”
Validate pipeline input length
“I have a JSON array of user IDs coming into my pipeline — can you count how many there are so I can decide whether to chunk it?”
Count CSV-style string entries
“I have a comma-separated string of tags and I need to know how many tags there are before storing them — can you count the items in it?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/list-lenWhen to prefer
Use this endpoint when an agent needs a quick, deterministic count of array or list elements as a lightweight preflight step — especially when avoiding shipping extra code, when operating in a cost-sensitive micro-task context at $0.001 USDC, or when chaining with other Delx utility routes. Prefer over custom code when keeping the agent runtime lean and stateless.
Side effects
- Invalid or missing 'items' field returns an error response
- Non-array input that cannot be parsed as a list may return an error
- Malformed JSON in the request body results in a 400-level error
- Payment not included or insufficient USDC triggers x402 payment-required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| items | array | Input field: items. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"empty": false,
"length": 3,
"sample": [
"a",
"b",
"c"
],
"schema": "delx/util-list-len/v1"
}
}Tags
x402
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