{"uid":"cap_j7rkJLieaD0Gm0bWe3yTE","slug":"delx-commerce-seeded-rendezvous-rank-c21571e3","name":"Delx Commerce — Seeded Rendezvous Rank","description":"Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.","url":"https://commerce.delx.ai/api/v1/x402/seeded-rendezvous-rank?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"key":{"type":"string","maxLength":8192,"description":"Key supplied to Seeded Rendezvous Rank; used only for this bounded calculation and processed in memory without retention."},"seed":{"type":"string","maxLength":8192,"description":"Seed supplied to Seeded Rendezvous Rank; used only for this bounded calculation and processed in memory without retention."},"nodes":{"type":"array","items":{"type":"string","maxLength":8192},"maxItems":256,"description":"Nodes supplied to Seeded Rendezvous Rank; used only for this bounded calculation and processed in memory without retention."}}},"responseSchema":{"type":"json","example":{"result":{"selected":"n2","ranked_nodes":[{"node":"n2","score":"bd039453c0ba9edb4613bcc40672868b77523fa05df3607d1284201813691a3e"},{"node":"n1","score":"444f37c2bc2a0abc09cffc79afebfd08a086442085bfb9f26fa31b239deaca4b"},{"node":"n3","score":"17909b5cada1fd90f21c1c871bf21f5be354a535f741ad9ea9879a42922989f9"}]},"schema":"delx/util-seeded-rendezvous-rank/v1","status":"pass","evidence":{"retained":false,"input_sha256":"3351b84ac1d977aa3f2c82a51fd28b618a255b972578172462ff51b4c20cf1b2","external_calls":0},"operation":"seeded_decision:seeded_rendezvous_rank"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_o6o2b_HReFiH5x6SuyEfH","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Deterministically ranks and selects a node from a list using a seeded rendezvous (HRW) hashing algorithm, returning a ranked list with cryptographic scores.","exampleAgentPrompt":"Use seeded rendezvous ranking to pick which node handles the key 'task-42' — seed it with 'deploy-round-7' and rank these three nodes: worker-A, worker-B, worker-C.","exampleUseCases":[{"title":"Consistent task assignment across workers","prompt":"I need to consistently assign job key 'job-8821' to one of these five workers — worker1, worker2, worker3, worker4, worker5 — using the seed 'batch-run-3' so the same worker always gets the same job."},{"title":"Reproducible shard selection for a distributed cache","prompt":"Given the cache key 'user:profile:99123' and seed 'shard-epoch-v2', rank these cache nodes — cache-us-east, cache-eu-west, cache-ap-south — and tell me which one should own this key."},{"title":"Agent fleet routing with verifiable audit trail","prompt":"I want to route request 'req-alpha-77' to one of my three AI agents — agent-red, agent-blue, agent-green — using seed 'fleet-v5', and I need a cryptographic record showing which agent was selected and why."}],"resultDescription":"Returns a JSON object with the top-selected node, a full ranked list of all nodes each with a deterministic hex score, plus an evidence block containing the SHA-256 of the inputs, a flag confirming no data was retained, and a count of zero external calls — enabling verifiable, auditable decisions.","failureModes":["Empty nodes array returns no selection","Exceeding 256 nodes limit returns a validation error","Malformed input types (non-string key or seed) cause schema rejection","Missing required fields may result in a 400 or incomplete response","Payment failure (x402) blocks execution before computation begins"],"whenToPreferThis":"Choose this endpoint when you need deterministic, reproducible node selection with cryptographic evidence of the decision — particularly in distributed systems where consistent hashing, verifiable audit trails, or agent-fleet routing are required. Prefer it over random selection when reproducibility across runs matters, and over custom HRW implementations when you want a pay-per-call, no-infrastructure, verifiable result with no data retention guarantees baked in.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T01:17:58.037Z","isFirstParty":false,"canonicalSlug":"delx-commerce-seeded-rendezvous-rank-c21571e3"}