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SignalDesk AI Population Variance Calculator
x402
SignalDesk AI Population 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 population variance (and denominator) for a given array of up to 1000 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 population variance as a float (e.g. 0.6666...) and the denominator (N, the count of observations) used in the calculation, confirming it is population variance rather than sample variance.
Example use cases
Quality control measurement spread
“I have sensor readings from our production line — 102.3, 98.7, 101.1, 99.5, 103.2, 100.0 — can you calculate the population variance so I can assess consistency?”
Financial returns volatility check
“Here are daily returns for a stock over the past week: 0.012, -0.005, 0.008, 0.021, -0.003, 0.015, -0.009 — what's the population variance of those returns?”
Student score dispersion analysis
“I've got test scores for my class of 10 students: 72, 85, 90, 68, 78, 95, 88, 74, 82, 79 — calculate the population variance so I can see how spread out the results are.”
Technical details
Endpoint
POSThttps://x402-agent.kariguetoazul.workers.dev/api/stats/population-variance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, inexpensive population variance computation (not sample variance) for up to 1000 numeric values without running local code. It is ideal for AI agents that need a verifiable, server-side statistical result billed per-call at $0.001 USDC via x402. Prefer this over client-side computation when auditability or reproducibility of the result matters, or when the agent environment lacks math libraries.
Side effects
- Empty or missing 'values' array returns a validation error
- More than 1000 items in the array exceeds maxItems limit and is rejected
- Non-numeric or non-finite values (NaN, Infinity) may be rejected or cause errors
- Values outside the allowed range (-1e15 to 1e15) will be rejected
- Insufficient USDC balance or x402 payment failure results in a 402 Payment Required response
- Network timeout on Cloudflare Worker edge node
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| values | array | Up to 1000 finite observations. |
Output
Schema · Response
{
"type": "json",
"example": {
"variance": 0.6666666666666666,
"denominator": 3
}
}Tags
x402
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