{"uid":"cap_dB1CJ-IakUkc1hwn_HZor","slug":"soren-verifiable-randomness-oracle-50f6b8de","name":"Soren Verifiable Randomness Oracle","description":"Publicly verifiable randomness from the drand League of Entropy beacon, attested and timestamped. Use it for a fair draw between parties who do not trust each other: a distributed network emits one signed value every 30 seconds and no participant, Soren included, can choose or predict it. Soren refuses to attest a round that does not verify, and you can check the same round yourself at api.drand.sh.","url":"https://soren.com/v1/oracle/random?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":[],"properties":{"round":{"type":"string","examples":["6391052"],"description":"Specific drand round. Omit for the latest. One round every 30 seconds."}}}},"additionalProperties":false}}},"responseSchema":{"type":"json","example":{"value":{"round":"<int>","as_float":"<0..1>","as_uint53":"<int>","signature":"<bls signature hex>","randomness":"<64 hex chars>","verify_yourself":"https://api.drand.sh/public/<round>"},"source":{"name":"drand / League of Entropy"},"provenance":{"signature":{"value":"<base64>","algorithm":"Ed25519"},"observed_at":"<ISO-8601 UTC>","upstream_sha256":"<hex>"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_3O4DwCLsXgrfKFoY_eNvN","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a publicly verifiable, attested random value from the drand League of Entropy beacon for a specific round or the latest round.","exampleAgentPrompt":"Give me the latest verifiable random value from the drand League of Entropy beacon — I need something no one could have predicted or rigged, so I can do a fair draw between contestants.","exampleUseCases":[{"title":"Fair lottery winner selection","prompt":"I need to pick a winner from 500 contest entries in a way that's completely tamper-proof — can you get a fresh verifiable random number from the drand beacon that I can share publicly so anyone can confirm the draw was fair?"},{"title":"Auditable NFT trait randomization","prompt":"I'm minting an NFT collection tonight and need a random seed that buyers can independently verify wasn't chosen by me — fetch round 6391052 from the drand oracle so I can publish the proof alongside the mint."},{"title":"Multi-party game random seed","prompt":"We're running an online game tournament and the players don't trust each other or us to provide the randomness — get the latest attested drand beacon value so everyone can verify the seed was unmanipulated before the match starts."}],"resultDescription":"A signed, timestamped attestation containing the drand round number, the random value emitted by the League of Entropy network for that round, a cryptographic signature, and the timestamp — all of which can be independently verified at api.drand.sh using the same round number.","failureModes":["Requested round does not exist or is in the future — Soren returns an error and refuses to attest","Drand network temporarily unavailable — upstream fetch fails","Round verification fails cryptographically — Soren refuses to attest and returns an error rather than an unverified value","Invalid round parameter format — schema validation error"],"whenToPreferThis":"Use this endpoint when you need randomness that must be verifiable and auditable by all parties without trusting any single participant — ideal for lotteries, giveaways, games, or any multi-party scenario where the source of randomness is contested. Prefer it over pseudo-random generators or centralized oracles when proof-of-fairness is a requirement. The 30-second round cadence means you can commit to a future round before the value is known, enabling pre-commitment schemes.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:33:06.807Z","isFirstParty":false,"canonicalSlug":"soren-verifiable-randomness-oracle-50f6b8de"}