HALOWERK Price History Volatility Safe-Drop Checker

x402

HALOWERK Price History Volatility Safe-Drop Checker is a paid API for AI agents from handel.halowerk.com, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-10).

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.

Price / call$0.007

Seller volume →—

Success—

StatusUnknown

How this service works

HALOWERK handelswerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.

Output

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.

Example use cases

Pre-purchase discount validation

“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%.”

Price alert bot false-positive filter

“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?”

E-commerce deal aggregator screening

“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.”

Technical details

Endpoint

POSThttps://handel.halowerk.com/v1/price/articles/history-volatility-safe-drop?utm_source=zero.xyz

When to prefer

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.

Side effects

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

Input

Schema · Request body

Field	Type	Description
url	string
history	array
previous	object
callback_url	string
drop_percent	number
max_cv_percent	number
idempotency_key	string

Output

Schema · Response

{
  "type": "json"
}

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