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Provably-Fair Random Winner Picker
x402
Provably-Fair Random 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 2026-10-28).
Selects a verifiably fair random winner from a comma-separated list of candidates using a seeded, auditable algorithm
Price / call$0.005
Success—
StatusUnknown
How this service works
Provably-fair winner selection from a comma-separated list. ?candidates=a,b,c&round=1&client_seed=s&nonce=1
Output
Returns a JSON object containing the selected winner's name, their zero-based index in the candidate list, the total number of candidates, a unique round ID, a cryptographic commit hash, and a verification string that allows independent parties to confirm the result was not manipulated.
Example use cases
Transparent giveaway winner selection
“I'm running a Twitter giveaway with these 5 entrants: @alice, @bob, @carol, @dave, @eve — pick a provably fair winner for round 1 using client seed 'giveaway2024' and nonce 1 so my followers can verify it was random.”
Fair team-split random assignment
“We have 6 players — Jordan, Sam, Taylor, Morgan, Riley, Casey — can you randomly pick one for the red team using a verifiable fair draw, round 1, seed 'teamdraft' and nonce 1?”
Auditable raffle draw for NFT drop
“Run a provably fair raffle pick from this list of wallet addresses: 0xAAA,0xBBB,0xCCC,0xDDD — use round 2, client seed 'nftdrop', nonce 3, and give me the commit hash so winners can audit the result.”
Technical details
Endpoint
GEThttps://pyfile-agent.taile3ff35.ts.net/data/fair/pick?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need auditable, tamper-evident random selection — e.g. giveaways, raffles, lotteries, or any scenario where participants must be able to independently verify the winner was chosen fairly. The commit-reveal scheme and client seed distinguish it from simple random number generators that offer no verifiability.
Side effects
- Missing candidates parameter returns an error
- Empty or malformed candidate list fails validation
- Missing required parameters (round, client_seed, nonce) may produce an error or default behavior
- Payment failure (402) if x402 payment is not provided
- Network timeout if the Tailscale node is unreachable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"commit": "ec5f307f...",
"verify": "GET /data/fair/verify?round=7&client_seed=z&nonce=3",
"winner": "a",
"round_id": "7",
"winner_index": 0,
"candidates_count": 3
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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