# Delx Seeded Queue Pick

> Delx Seeded Queue Pick 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).

Deterministically selects one item from a list of queues using a seed string, returning the selected item and its index.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/seeded-queue-pick
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-seeded-queue-pick-77f776ef
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ap6Mz86o7hVAg27w-X9OI

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability delx-seeded-queue-pick-77f776ef -d '<json body>'
```

Example prompt: Pick one queue from ['fast', 'slow', 'batch'] using the seed 'user-abc123' — I need the same seed to always land on the same queue.

## When to prefer this

Use this endpoint when you need a fast, deterministic, stateless way to select one item from a list of queues or options given a string seed — particularly useful when you need stability (same seed always yields same choice) without running your own hashing logic. Prefer it over random selection when reproducibility across retries or distributed agents is important, and over custom code when you want a governed, auditable micro-computation with an evidence receipt.

## Known failure modes

- Empty queues array returns an error or undefined result
- Seed exceeding 8192 characters will be rejected
- Queues array exceeding 256 items will be rejected
- Malformed JSON body returns a 400-level error
- Missing required fields (seed or queues) may cause a validation error

## How this service works

Seeded Queue Pick: Seeded Queue Pick selects one queue reproducibly from available queue names from bounded caller-supplied values without an external provider. Call Seeded Queue Pick when an agent needs a reproducible decision that another run can independently replay. Returns the deterministic selection plus seed provenance, population bounds, and the operation-specific outcome for Seeded Queue Pick as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless,…

## Output

Returns a JSON object with the selected queue string, its zero-based index in the input array, a status of 'pass', and an evidence block confirming no data retention and zero external calls — the schema is delx/util-seeded-queue-pick/v1.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "seed": {
   "type": "string",
   "maxLength": 8192,
   "description": "Seed supplied to Seeded Queue Pick; used only for this bounded calculation and processed in memory without retention."
  },
  "queues": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 8192
   },
   "maxItems": 256,
   "description": "Queues supplied to Seeded Queue Pick; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "index": 0,
   "selected": "fast"
  },
  "schema": "delx/util-seeded-queue-pick/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "9b3ef1324230b469242f8c2b28232bcd414db5b4884968b8f132b504ea640cf6",
   "external_calls": 0
  },
  "operation": "seeded_decision:seeded_queue_pick"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-seeded-queue-pick-77f776ef/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)