{"uid":"cap_kFwV-V5CedkXMDRjh4B0r","slug":"signaldesk-ai-standard-deviation-calculator-747cd68d","name":"SignalDesk AI Standard Deviation Calculator","description":"Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.","url":"https://x402-agent.kariguetoazul.workers.dev/api/stats/standard-deviation?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"values":{"type":"array","items":{"type":"number","maximum":1000000000000000,"minimum":-1000000000000000},"maxItems":1000,"minItems":1,"description":"Up to 1000 finite observations."}}},"responseSchema":{"type":"json","example":{"standard_deviation":0.816496580927726}},"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_JxU4Fn2NK7WjcE1qk4U3s","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":"Computes the standard deviation of a provided array of numeric observations","exampleAgentPrompt":"Can you calculate the standard deviation of these values for me: 2, 4, 4, 4, 5, 5, 7, 9?","exampleUseCases":[{"title":"Financial returns volatility measurement","prompt":"I have a list of daily stock returns for the past month: 0.02, -0.01, 0.03, 0.005, -0.02, 0.015, 0.01, -0.005, 0.025, -0.03, 0.04, 0.012, -0.008, 0.022, 0.018, -0.015, 0.007, 0.033, -0.011, 0.009 — can you tell me the standard deviation so I can understand the volatility?"},{"title":"Quality control batch inspection","prompt":"I've recorded the weights of 10 manufactured parts in grams: 100.1, 99.8, 100.3, 100.0, 99.9, 100.2, 99.7, 100.4, 100.1, 99.6 — what's the standard deviation so I can check if production is consistent?"},{"title":"Student test score dispersion","prompt":"Here are the exam scores from my class of 15 students: 72, 85, 90, 68, 77, 88, 95, 62, 79, 83, 91, 74, 87, 66, 80 — compute the standard deviation so I know how spread out the results are."}],"resultDescription":"A JSON object containing a single field 'standard_deviation' with the computed standard deviation as a floating-point number (e.g. {\"standard_deviation\": 0.816496580927726})","failureModes":["Empty array provided — minItems:1 requires at least one value","Array exceeds 1000 items — maxItems:1000 limit enforced","Non-numeric values in array cause validation failure","Values outside ±1,000,000,000,000,000 range rejected","Payment not included or insufficient — x402 payment required at $0.001 USDC per call","Network timeout from Cloudflare Workers execution limits"],"whenToPreferThis":"Choose this endpoint when you need a quick, inexpensive, server-side standard deviation calculation on up to 1000 numeric values without implementing the math yourself. Ideal for AI agents needing statistical dispersion on the fly during analysis pipelines. At $0.001 USDC per call via x402, it is cost-effective for per-request use. Prefer this over rolling your own computation when correctness, auditability, and simplicity matter.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:41:28.787Z","isFirstParty":false,"canonicalSlug":"signaldesk-ai-standard-deviation-calculator-747cd68d"}