# Delx Seeded Time Slot Pick

> Delx Seeded Time Slot Pick is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).

Deterministically selects a time slot from a list using a seed value, returning the chosen slot and its index.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/seeded-time-slot-pick?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-seeded-time-slot-pick-1d20f3c0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pfxrk9X6_1wUdMUBeh6zT

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-time-slot-pick-1d20f3c0 -d '<json body>'
```

Example prompt: Using the seed 'user-42-booking' and the available time slots ['09:00','09:30','10:00','10:30'], deterministically pick one time slot for me.

## When to prefer this

Choose this endpoint when you need a reproducible, auditable, seed-driven selection of a single time slot from a bounded list — especially when the same seed must always yield the same slot (idempotent assignment), when you need an audit trail via input hash, and when no external state or randomness should be involved. Prefer over random selection when fairness, reproducibility, or auditability is required.

## Known failure modes

- Empty slots array — no slot can be selected, likely returns an error or null result
- Seed too long — exceeds maxLength of 8192 characters
- Slots list exceeds 256 items — request rejected by schema validation
- Malformed input JSON — returns 400 or schema validation error
- Network or service unavailability — returns 5xx error

## How this service works

Seeded Time Slot Pick: Seeded Time Slot Pick selects a reproducible slot from caller-provided time labels from bounded caller-supplied values without an external provider. Call Seeded Time Slot 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 Time Slot Pick as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First…

## Output

Returns a JSON object containing the selected time slot string, its zero-based index in the input list, an operation identifier, a status of 'pass', and an evidence block confirming no data retention, zero external calls, and the SHA-256 hash of the input — ensuring verifiability and auditability of the deterministic selection.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "index": 1,
   "selected": "09:30"
  },
  "schema": "delx/util-seeded-time-slot-pick/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "8ab1719fd1d9abb74cb235aa38e717b959aadf50567d361bc601a950d82cfbb8",
   "external_calls": 0
  },
  "operation": "seeded_decision:seeded_time_slot_pick"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-seeded-time-slot-pick-1d20f3c0/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)