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Delx Standard Deviation
x402
Delx Standard Deviation is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Computes population and/or sample standard deviation for a list of numeric values
Price / call$0.001
Success—
StatusUnknown
How this service works
Standard deviation. Call for simple volatility or spread checks on agent-collected samples. Returns population/sample stdev fields depending on input flags. $0.001 USDC per successful call via x402 on Base—deterministic first-party JSON, no API key, no subscription, and nothing is billed on structured validation errors.
Output
Returns a JSON object containing population standard deviation and/or sample standard deviation fields computed from the supplied numeric array, depending on input flags provided.
Example use cases
Volatility check on price samples
“I collected 20 price samples from different vendors — [4.50, 4.75, 5.10, 4.90, 5.20, 4.65, 4.80, 5.00, 4.70, 4.95, 5.15, 4.60, 4.85, 5.05, 4.55, 4.78, 5.08, 4.68, 4.92, 5.25] — can you compute the standard deviation so I can see how volatile pricing is across suppliers?”
Quality control spread on measurements
“I have a batch of 15 part measurements in millimeters: [10.01, 9.99, 10.02, 10.00, 9.98, 10.03, 9.97, 10.01, 10.00, 9.99, 10.02, 9.98, 10.01, 10.00, 9.99] — what's the sample standard deviation to check if they're within tolerance?”
Score dispersion in agent survey results
“My agent gathered these response scores from 12 users: [7, 8, 6, 9, 7, 8, 5, 9, 8, 7, 6, 8] — calculate the standard deviation to see how consistent the feedback was.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/stdevWhen to prefer
Choose this endpoint when an agent needs a deterministic, pay-per-call standard deviation computation without managing an API key or subscription. Ideal for lightweight statistical checks on agent-collected numeric samples — especially volatility or spread checks in automated pipelines where reproducibility matters and billing only occurs on successful calls.
Side effects
- Empty or missing values array returns a structured validation error (not billed)
- Non-numeric items in the array cause a validation error
- Array exceeding 10,000 items is rejected
- Payment failure or insufficient USDC balance on Base results in 402 error
- Malformed JSON body returns a validation error (not billed)
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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