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Delx Commerce — Standard Deviation Calculator
x402
Delx Commerce — Standard Deviation Calculator is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
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.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
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').
Example use cases
Sensor data variability check
“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?”
Student grade spread analysis
“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?”
Financial return dispersion
“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?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/stdev?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| sample | — | Optional sample input. |
| values | array | Numeric samples for stats tools (mean/median/stdev/percentile). Cap 10k numbers. |
Output
Schema · Response
{
"type": "json",
"example": {
"mean": 6,
"mode": "population",
"count": 5,
"stdev": 2.82842712474619,
"schema": "delx/stdev/v1"
}
}Tags
x402
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