{"uid":"cap_oTUv_slmS2RgCJWwK_kcv","slug":"entropy-rip-verifiable-list-shuffle-4e57310e","name":"entropy.rip Verifiable List Shuffle","description":"Shuffles a list of items verifiably using Drand and local system entropy","url":"https://entropy.rip/api/entropy/shuffle","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"items":{"type":"array","items":{"type":"string"},"description":"items"},"weights":{"type":"array","items":{"type":"integer"},"description":"weights"}}},"responseSchema":{"type":"json","example":{"seed":"a1b2c3d4...","selected":"C","shuffled":["C","B","A"],"timestamp":"2026-07-14T09:20:00Z","drand_round":4015682,"drand_signature":"signature_hex"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_NKj21sU9Oeon0t--x_xAX","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Shuffles a list of string items verifiably using Drand beacon randomness and local system entropy, with optional integer weights","exampleAgentPrompt":"Shuffle this list of contestants verifiably using Drand randomness: ['Alice', 'Bob', 'Carol', 'Dave', 'Eve'] — I want a cryptographically provable fair ordering for our tournament bracket.","exampleUseCases":null,"resultDescription":"Returns the input list reordered in a new random sequence, with cryptographic provenance from Drand beacon randomness combined with local system entropy, allowing independent verification that the shuffle was not manipulated.","failureModes":["Empty items array returns error or trivial result","Weights array length mismatch with items array causes validation error","Drand beacon unavailability may cause timeout or fallback","Non-string items in the array may cause schema validation failure","Payment failure (402) if USDC payment not provided or insufficient"],"whenToPreferThis":"Use this endpoint when you need a provably fair, auditable shuffle — e.g. tournament brackets, raffle draws, randomized assignment — where participants need cryptographic proof that the ordering was not rigged. Prefer this over local PRNG-based shuffles when verifiability and trust matter.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:39:51.199Z","isFirstParty":false}