{"uid":"cap_lsBnbX_frgCmbgQfaTWIP","slug":"halowerk-price-history-volatility-safe-drop-checker-385eff6d","name":"HALOWERK Price History Volatility Safe-Drop Checker","description":"HALOWERK handelswerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.","url":"https://handel.halowerk.com/v1/price/articles/history-volatility-safe-drop?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","maxLength":2048},"history":{"type":"array","items":{"type":"object","required":["url","observed_at","value","currency"],"properties":{"url":{"type":"string","maxLength":2048},"value":{"type":"number","maximum":1000000000,"minimum":0},"currency":{"type":"string","pattern":"^[A-Z]{3}$"},"observed_at":{"type":"string","maxLength":40}},"additionalProperties":false},"maxItems":60,"minItems":3},"previous":{"type":"object","required":["value","currency"],"properties":{"value":{"type":"number","maximum":1000000000,"minimum":0},"currency":{"type":"string","pattern":"^[A-Z]{3}$"}},"additionalProperties":false},"callback_url":{"type":"string","maxLength":2048},"drop_percent":{"type":"number","maximum":100,"exclusiveMinimum":0},"max_cv_percent":{"type":"number","maximum":10000,"exclusiveMinimum":0},"idempotency_key":{"type":"string","pattern":"^[A-Za-z0-9_-]+$","maxLength":128,"minLength":32}}},"responseSchema":{"type":"json"},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.007","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":"$0.007/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.007","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.007","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_vL47s80-NbOiWA6RLyGEA","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.007","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Analyzes a product's price history to determine whether a current price drop is statistically safe (low volatility) or suspicious, using coefficient of variation thresholds.","exampleAgentPrompt":"Check whether the 35% price drop on https://shop.example.com/product/123 is statistically safe — here's its price history for the last 30 days (in USD), the previous price was $89.99, and flag it only if the coefficient of variation is under 15%.","exampleUseCases":[{"title":"Pre-purchase discount validation","prompt":"Before I buy this laptop that's showing a 40% discount at https://store.example.com/laptops/model-x, can you check if this drop is genuine and low-volatility? The previous price was $1,200 USD, here's the 60-day price history in USD, and only consider it safe if the CV is under 20%."},{"title":"Price alert bot false-positive filter","prompt":"My price tracker just fired an alert for a 25% drop on https://marketplace.example.com/item/456 — previous price was $49.99 USD. Before I notify the user, can you verify this drop passes the safe-drop volatility check with a max CV of 10% using this 30-day price history?"},{"title":"E-commerce deal aggregator screening","prompt":"I'm aggregating deals and need to screen out fake or volatile discounts — run a safe-drop volatility check on https://deals.example.com/product/789, previous price was $200 USD, the observed price drop is 30%, max CV allowed is 12%, and here's the 45-day history in USD."}],"resultDescription":"Returns a JSON result indicating whether the observed price drop is deemed 'safe' (i.e., the price series has low enough volatility as measured by the coefficient of variation), along with computed statistical measures such as the CV percentage and likely a boolean safe/unsafe verdict. May include supporting statistics from the price history analysis.","failureModes":["Fewer than 3 history items provided — minimum minItems:3 not met","History array exceeds 60 items — maxItems:60 exceeded","drop_percent or max_cv_percent set to 0 or negative — exclusiveMinimum:0 violated","Currency code not 3 uppercase letters — pattern mismatch","Idempotency key too short (min 32 chars) or contains invalid characters","Payment not included or rejected — x402 payment required","Malformed URL in url or callback_url fields"],"whenToPreferThis":"Choose this endpoint when you need a statistically grounded verdict on whether a price drop is genuine rather than an artifact of high price volatility. It is specifically designed for the 'safe drop' pattern — filtering out discounts that are meaningless because the product's price fluctuates wildly. Prefer this over simple threshold checks when you have a price history array and want a coefficient-of-variation-based filter to avoid false deal alerts.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T12:35:11.675Z","isFirstParty":false,"canonicalSlug":"halowerk-price-history-volatility-safe-drop-checker-385eff6d"}