# Delx Seeded Winners Without Replacement

> Delx Seeded Winners Without Replacement is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Deterministically select a fixed number of winners from a candidate list using a seed, ensuring no duplicate selections and reproducible results.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/seeded-winners-without-replacement
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-seeded-winners-without-replacement-04e9b4cb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__y0UlDsYT5519FEZuJsf9

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-winners-without-replacement-04e9b4cb -d '<json body>'
```

Example prompt: Pick 3 winners without replacement from this list — ['alice','bob','carol','david','eve'] — using the seed 'contest-2024-june' so the draw is reproducible and auditable.

## When to prefer this

Use this endpoint when you need a deterministic, auditable, and reproducible random selection from a candidate list with no repeated picks — especially for lotteries, raffles, A/B assignments, or any governed draw where the same seed must always produce the same winners. Prefer it over stateful or non-deterministic random services when verifiability and zero data retention matter.

## Known failure modes

- winner_count exceeds number of candidates — cannot select more winners than candidates without replacement
- invalid or missing seed causes unpredictable or rejected computation
- candidates array exceeds 256 items limit
- empty candidates array with non-zero winner_count
- malformed input types (e.g. non-integer winner_count)

## How this service works

Seeded Winners Without Replacement: Seeded Winners Without Replacement draws an ordered reproducible winner list without replacement from bounded caller-supplied values without an external provider. Call Seeded Winners Without Replacement 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 Winners Without Replacement as versioned determini…

## Output

Returns a JSON object containing the list of selected winners (no duplicates), the count of winners selected, a boolean indicating no monetary claim, the input SHA-256 hash for auditability, confirmation that inputs were not retained, and the number of external calls made (zero).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "seed": {
   "type": "string",
   "maxLength": 8192,
   "description": "Seed supplied to Seeded Winners Without Replacement; used only for this bounded calculation and processed in memory without retention."
  },
  "candidates": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 8192
   },
   "maxItems": 256,
   "description": "Candidates supplied to Seeded Winners Without Replacement; used only for this bounded calculation and processed in memory without retention."
  },
  "winner_count": {
   "type": "integer",
   "description": "Winner Count supplied to Seeded Winners Without Replacement; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "count": 3,
   "winners": [
    "d",
    "c",
    "b"
   ],
   "monetary_claim": false
  },
  "schema": "delx/util-seeded-winners-without-replacement/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "7854633a204eec63fedb89d8b9c7942b2651237bdee78ebb4e3b8378e7a3d424",
   "external_calls": 0
  },
  "operation": "seeded_decision:seeded_winners_without_replacement"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-seeded-winners-without-replacement-04e9b4cb/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)