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Animica Random Shuffle (DRNG)
x402
Animica Random Shuffle (DRNG) is a paid API for AI agents from animica.dev, paid per call via x402, $0.001812/call, status unknown (last checked 2026-09-13).
Shuffles a list or generates a random permutation of 1..n using a Decentralized Random Number Generator (DRNG) with cryptographic attestation
Price / call$0.001812
Success—
StatusUnknown
How this service works
Fisher-Yates permutation of your list (or of 1..N), up to 10000 items, derived from ONE verified randomness draw. Returns the permutation of 0-based indices plus the shuffled items, with the exact swap-and-byte-consumption rule so you can recompute it offline.
Output
Returns a JSON object containing: the shuffled items array, 0-based permutation indices, item count, randomness source details, DRNG attestation and verification proof, step-by-step derivation rules for recomputation, and payment metadata. The attestation allows anyone to independently verify the shuffle was fair and untampered.
Example use cases
Fair raffle winner ordering
“I have a list of 50 contest entrant names and need to randomly order them for a fair draw — can you shuffle them using Animica's DRNG and give me the shuffled list with an attestation I can show participants?”
Random card deck shuffle
“Shuffle a standard 52-card deck for me using Animica's verifiable randomness, tag the request 'poker-game-042', so we have a cryptographic proof of the shuffle order.”
Random permutation for A/B test assignment
“Generate a random permutation of the numbers 1 through 200 using Animica's DRNG — I need to assign users to groups in a verifiably unbiased order for an experiment.”
Technical details
Endpoint
POSThttps://animica.dev/x402/random/shuffleWhen to prefer
Choose this endpoint when you need a cryptographically attested, auditable random shuffle — e.g. for lotteries, card games, A/B test assignments, or any scenario where fairness must be verifiable. The attestation and derivation steps distinguish it from simple pseudo-random shuffles. Prefer it over generic randomization when an independent party needs to verify the shuffle was not manipulated.
Side effects
- Both 'items' and 'n' supplied simultaneously — endpoint requires exactly one
- n out of range (must be 1–10000) — returns validation error
- items list exceeds 10000 entries — rejected with size error
- Payment not provided or insufficient — x402 payment required ($0.006731 USDC)
- Invalid JSON body — parse error returned
- DRNG source unavailability — health field indicates degraded state
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| n | integer | shuffle 1..n instead of a supplied list (1..10000); supply exactly one of items or n |
| items | array | the list to shuffle, 1..10000 entries (any JSON values) |
| request_id | string | your own tag; mixed into the DRNG seed |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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