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Delx Array First
x402
Delx Array First is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns the first element of an input array along with an empty flag, safely handling edge cases.
Price / call$0.001
Success—
StatusUnknown
How this service works
Return the first list element. Call when you need head of an agent-held array safely. Returns value and empty flag for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.
Output
Returns the first element of the provided array and a boolean empty flag indicating whether the array had no items. If the array is empty, the value field will be absent or null and the empty flag will be true.
Example use cases
Safely peek at queue head
“I have a task queue stored as a JSON array like ["task-001", "task-002", "task-003"] — grab the first item so I know what to process next, and also tell me if the queue is empty.”
Pipeline first-result extraction
“My agent collected a list of search results as an array and I just need the top result: ["https://example.com", "https://other.com"] — pull the first one out safely.”
Defensive head-of-list check
“I'm not sure if my list of pending notifications is empty or not — the array is []. Can you get the first element and flag whether the list was empty so I don't crash my workflow?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/arr-firstWhen to prefer
Choose this endpoint when you need a reliable, safe way to retrieve the first element of an agent-held array without writing custom index logic, especially when you need an explicit empty-array signal to guard downstream workflow steps. Ideal for lightweight agentic pipelines that already use x402 micropayments on Base and want a stateless, no-retention utility call.
Side effects
- Missing or null 'items' field returns a validation error
- Non-array value for 'items' causes a type error
- Payment failure or insufficient USDC balance results in 402 response
- Network timeout if the x402 payment handshake stalls
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| items | array | Input field: items. |
Output
Schema · Response
{
"type": "json",
"example": {
"empty": false,
"value": "alpha",
"schema": "delx/util-arr-first/v1"
}
}Tags
x402
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