{"uid":"cap_ArpTahBIyu-bxeTU4zRcN","slug":"proof-random-api-free-drand-beacon-sampler-e08e5b1c","name":"Proof Random API – Free drand Beacon Sampler","description":"A free drand quicknet beacon relay with nonce-bound reproducible sampling. Client-side BLS verification required.","url":"https://proof-random-api.pn-26f.workers.dev/v1/api-qa?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["url"],"properties":{"url":{"type":"string"},"expect":{"enum":["x402","mcp","http"],"type":"string"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Ck-05nLO0-_SIe5H5SfmY","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Relays a drand quicknet randomness beacon with nonce-bound reproducible sampling, returning verifiable on-chain randomness that clients must verify via BLS signature.","exampleAgentPrompt":"Fetch me a fresh drand quicknet randomness beacon sample — I need a nonce-bound reproducible random value with BLS verification data so I can prove the result is unbiased.","exampleUseCases":[{"title":"Fair on-chain lottery draw","prompt":"I'm running a lottery smart contract and need a tamper-proof random seed — can you pull a fresh drand quicknet beacon sample with the BLS signature so I can verify it client-side before the draw?"},{"title":"Random seed for NFT trait generation","prompt":"I need a cryptographically verifiable random value to assign traits fairly across my NFT collection — grab me a nonce-bound drand beacon sample I can reproduce and audit later."},{"title":"Unbiased winner selection for a giveaway","prompt":"I'm picking a giveaway winner and want to prove the selection was fair — fetch a drand randomness beacon with full BLS proof so participants can independently verify the result."}],"resultDescription":"Returns a drand quicknet beacon payload including the current round number, the randomness value (hex or base64), and a BLS signature. The nonce-bound sampling makes results reproducible for a given nonce, and clients are expected to perform BLS verification independently to confirm authenticity.","failureModes":["drand network unreachable or slow — relay may time out or return stale round","BLS verification failure client-side if signature data is malformed","Invalid 'expect' enum value causes request rejection","Payment not provided or insufficient (requires $0.05 USDC via x402) — returns 402 Payment Required","Missing required 'url' field in POST body causes 400 error"],"whenToPreferThis":"Choose this endpoint when you need publicly verifiable, tamper-proof randomness backed by the drand distributed network (quicknet) and want nonce-bound reproducibility for auditability. Prefer it over pseudo-random or centralized RNG services when cryptographic fairness and BLS-verifiable proofs are required — e.g. for lotteries, games, NFT trait assignment, or any selection that must be provably unbiased. It is not suitable for high-volume free randomness needs given the $0.05/call cost.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T00:40:10.055Z","isFirstParty":false,"canonicalSlug":"proof-random-api-free-drand-beacon-sampler-e08e5b1c"}