{"uid":"cap_Mm3iE2NCc6Qfwfoq1G6Cu","slug":"delx-commerce-standard-deviation-calculator-bd5fd39a","name":"Delx Commerce — Standard Deviation Calculator","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/stdev?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"sample":{"description":"Optional sample input."},"values":{"type":"array","items":{"type":"number"},"maxItems":10000,"minItems":1,"description":"Numeric samples for stats tools (mean/median/stdev/percentile). Cap 10k numbers."}}},"responseSchema":{"type":"json","example":{"mean":6,"mode":"population","count":5,"stdev":2.82842712474619,"schema":"delx/stdev/v1"}},"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__WGyW7DrzxVQb6wiVqKha","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 population standard deviation (and mean, mode, count) for a supplied list of up to 10,000 numeric values, paid per-result in USDC via x402.","exampleAgentPrompt":"Calculate the standard deviation of these numbers for me: 2, 4, 4, 4, 5, 5, 7, 9.","exampleUseCases":[{"title":"Sensor data variability check","prompt":"I have a list of temperature readings from my IoT sensors — 21.3, 22.1, 19.8, 23.4, 20.5, 22.9 — can you compute the standard deviation so I can see how much they're fluctuating?"},{"title":"Student grade spread analysis","prompt":"Here are the exam scores for my class: 55, 62, 70, 74, 78, 81, 85, 91, 95, 99. What's the standard deviation so I can understand how spread out the grades are?"},{"title":"Financial return dispersion","prompt":"Can you calculate the standard deviation of these monthly portfolio returns: 1.2, -0.5, 3.1, 2.8, -1.4, 0.9, 4.2, -2.1, 1.7, 0.3?"}],"resultDescription":"Returns a JSON object containing the population standard deviation ('stdev'), arithmetic mean ('mean'), sample count ('count'), the statistical mode used ('mode', e.g. 'population'), and a schema identifier ('schema': 'delx/stdev/v1').","failureModes":["Empty or missing 'values' array returns a validation error","Array exceeding 10,000 items is rejected with a size-limit error","Non-numeric values in the array cause a type validation failure","Insufficient USDC payment via x402 returns a 402 Payment Required response","Single-element arrays may return stdev of 0 with no error"],"whenToPreferThis":"Choose this endpoint when an AI agent needs a quick, pay-per-use statistical computation for standard deviation without setting up an account or subscription. Ideal for lightweight, one-off numerical analysis tasks where the agent already handles USDC payments via x402, and where integrating a full statistical library is overkill. Best for datasets up to 10,000 numbers requiring population standard deviation alongside mean and count.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T00:54:07.187Z","isFirstParty":false,"canonicalSlug":"delx-commerce-standard-deviation-calculator-bd5fd39a"}