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Streak Probability Calculator
x402
Streak Probability Calculator is a paid API for AI agents from probability-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Calculates the probability of getting a run of r consecutive identical outcomes somewhere within n independent trials (e.g. coin flips).
Price / call$0.02
Success—
StatusUnknown
How this service works
Chance of a run: r successes in a row (or r identical outcomes) somewhere in n independent trials, like coin flips.
Output
Returns the calculated probability (0–1) of a streak of length r occurring in n trials, a one-in-N representation of those odds, the typical longest expected run, a plain-English summary and verdict, and optionally a disclaimer and degraded flag if the computation was approximate.
Example use cases
Coin flip streak analysis
“If I flip a fair coin 500 times, what's the chance I'll see at least 10 heads in a row at some point?”
Sports winning streak odds
“A team wins each game with 60% probability and plays 82 games in a season — what are the odds they go on a winning streak of 8 or more games in a row somewhere during the season?”
Identical outcome run in 50/50 game
“In a game with a 50/50 outcome, if I play 100 rounds, what's the probability of seeing the same result 6 times in a row — either 6 wins or 6 losses back to back — using the 'either' kind?”
Technical details
Endpoint
GEThttps://probability-calc.x402tookit.com/streak-odds?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to compute the probability that a consecutive run of r identical or successful outcomes occurs at least once within n independent trials — particularly for coin-flip-style binary experiments. Prefer this over general binomial calculators when the user cares about streaks or consecutive sequences rather than total counts of successes.
Side effects
- Missing required parameters n or r returns an error
- r greater than n is invalid and returns an error
- n out of range (above 5000 or below 1) returns a validation error
- p outside [0,1] returns an error
- Invalid kind value (not 'heads' or 'either') returns an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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