# Provably-Fair Multi-Winner Picker

> Provably-Fair Multi-Winner Picker is a paid API for AI agents from pyfile-agent.taile3ff35.ts.net, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Selects N distinct winners from a candidate list using a provably-fair, verifiable randomness scheme with a client seed and nonce.

## Facts

- Endpoint: GET https://pyfile-agent.taile3ff35.ts.net/data/fair/pick-many
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/provably-fair-multi-winner-picker-95061355
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WOyKpQuCMEc-Uf5T3N7K7

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 provably-fair-multi-winner-picker-95061355
```

Example prompt: Pick 3 distinct winners from this list — Alice, Bob, Carol, Dave, Eve — using round 1, client seed 'myseed42', and nonce 1, and make sure the selection is provably fair so anyone can verify it.

## When to prefer this

Choose this endpoint when you need to select multiple distinct winners (N > 1) from a list and require cryptographic verifiability — i.e., anyone can re-run the selection and confirm it matches using the same seed and nonce. Prefer the sibling single-winner endpoint when you only need one pick. Use this over a simple random shuffle when auditability and fairness proof matter, such as public contests, lotteries, or regulated draws.

## Known failure modes

- count exceeds number of candidates — cannot pick more winners than there are entries
- missing required parameters (candidates, count, round, client_seed, nonce) — HTTP 400 bad request
- candidates list is empty — returns error or empty result
- duplicate candidates in input may affect distinctness guarantees
- network timeout or server unavailability — HTTP 5xx

## How this service works

Provably-fair selection of N distinct winners from a list. ?candidates=a,b,c&count=2&round=1&client_seed=s&nonce=1

## Output

Returns an array of N distinct selected winners drawn from the candidate list, along with provenance data (round, client seed, nonce, and a verifiable hash or proof) so that any third party can reproduce and confirm the selection was not manipulated.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   }
  },
  "output": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/provably-fair-multi-winner-picker-95061355/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pyfile-agent.taile3ff35.ts.net](https://www.zero.xyz/host/pyfile-agent.taile3ff35.ts.net/llms.txt)