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SignalDesk AI – Sample Variance Calculator
x402
SignalDesk AI – Sample Variance Calculator is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).
Computes the sample variance of a provided array of numeric observations
Price / call$0.001
Success—
StatusUnknown
How this service works
Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.
Output
Returns a JSON object containing the computed sample variance (using n-1 denominator for unbiased estimation) and the denominator value used in the calculation.
Example use cases
Quality control variation analysis
“I have measurements from our production line — 102.3, 98.7, 101.1, 99.5, 103.2, 100.0 — can you compute the sample variance to see how consistent they are?”
Student grade spread analysis
“Here are the exam scores for my class: 72, 85, 90, 61, 78, 88, 95, 70, 83, 66. What is the sample variance of these grades?”
Financial return volatility check
“Can you calculate the sample variance of these monthly returns: 2.1, -0.5, 3.3, 1.8, -1.2, 4.0, 0.7, 2.9 so I can gauge how volatile this portfolio has been?”
Technical details
Endpoint
POSThttps://x402-agent.kariguetoazul.workers.dev/api/stats/sample-variance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, paid, serverless sample variance computation without running your own statistical library — especially useful in agent pipelines where deterministic statistical outputs are needed on-demand with micro-payment billing via x402 and no infrastructure setup.
Side effects
- Fewer than 2 values provided — minimum 2 observations required
- Array exceeds 1000 items — maxItems limit enforced
- Individual values exceed ±1e15 magnitude — boundary enforced
- Invalid input types (non-numbers in array) — schema validation error
- Payment failure (x402) — 402 response if USDC payment not attached
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| values | array | At least two observations. |
Output
Schema · Response
{
"type": "json",
"example": {
"variance": 1,
"denominator": 2
}
}Tags
x402
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