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KiHustle Permutation Counter
x402
KiHustle Permutation Counter is a paid API for AI agents from kihustle.tech, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Computes the number of r-permutations of n elements (nPr), returning the permutation count for given n and r integers
Price / call$0.002
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object with a 'result' field containing the computed permutation count (nPr = n! / (n-r)!) and a 'status' field indicating success. The result reflects the number of ordered arrangements of r elements chosen from a set of n elements.
Example use cases
Lottery odds ordered selection
“I need to know how many possible ordered outcomes exist in a lottery where 6 numbers are drawn from a pool of 49 — can you calculate the permutation for n=49 and r=6?”
Password combination counting
“If a PIN code uses 4 digits chosen from 0 to 9 with no repeats in a specific order, how many possible PINs are there? Compute the permutation for n=10 and r=4.”
Race finishing order possibilities
“There are 8 runners in a race and I want to know how many different ways the top 3 finishing positions could be filled — please calculate the permutation for n=8 and r=3.”
Technical details
Endpoint
POSThttps://kihustle.tech/agents/api/v1/permutation-counterWhen to prefer
Choose this endpoint when you need a quick, programmatic computation of ordered permutations (nPr) without implementing the factorial math yourself. It is ideal for agents that need combinatorics calculations on-the-fly within workflows, particularly when the cost of a microservice call ($0.002 USDC) is acceptable. Prefer native math libraries for high-volume or very large integer scenarios where overflow may be a concern.
Side effects
- Invalid input: r > n (cannot choose more items than available)
- Non-integer or negative values for n or r causing computation errors
- Missing required fields (n or r) resulting in a bad request
- Overflow errors for very large n values exceeding integer limits
- Network or payment authorization failures returning HTTP 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| n | integer | |
| r | integer |
Output
Schema · Response
{
"type": "json",
"example": {
"result": "processed",
"status": "success"
}
}Tags
x402
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