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Focus & Sleep Planner – Caffeine Decay Calculator
x402
Focus & Sleep Planner – Caffeine Decay Calculator is a paid API for AI agents from focus-sleep-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates how much caffeine remains in your system after a given number of hours and when it will drop below a customizable threshold, using an adjustable half-life model.
Price / call$0.02
Success—
StatusUnknown
How this service works
Caffeine remaining after hours, and the time until it drops below a threshold, from a half-life you can set (default 5 hours).
Output
Returns a JSON object with the remaining caffeine in mg at the requested time, the clock time when caffeine will drop below the threshold, a half-life table showing decay over time, optional bedtime and dose clock timestamps, a human-readable summary and verdict, and a disclaimer. If bedtime and dose time are provided, also includes the caffeine level at bedtime.
Example use cases
Late-afternoon coffee sleep impact check
“I drank a large coffee with about 150mg of caffeine at 3:30 PM and I'm planning to go to bed at 11 PM. How much caffeine will I have in my system at bedtime and when will it finally drop below 25mg? My metabolism is pretty average so use the default half-life.”
Pre-workout supplement evening planning
“I took 300mg of caffeine from my pre-workout at 5:00 PM — it's now been 3 hours. How much is still in my system and when will I drop below 25mg? I want to make sure I can sleep by midnight.”
Fast metabolizer caffeine modeling
“I process caffeine really quickly, my half-life is about 3.5 hours. I had 100mg at noon — how much do I have left now after 5 hours, and when will it go below 20mg so I can sleep?”
Technical details
Endpoint
GEThttps://focus-sleep-calc.x402tookit.com/caffeine-decay?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need precise, parameterized caffeine decay modeling with customizable half-life and threshold values — especially when the user wants to know their personal caffeine clearance time relative to a specific bedtime or sleep goal. Prefer this over generic caffeine advice when you need structured numeric output (remaining mg, clock times, decay table) suitable for follow-on planning logic.
Side effects
- Missing required doseMg parameter returns an error
- doseMg outside valid range (1–2000) may be rejected or produce unexpected results
- Invalid halfLifeHours (outside 0.5–24) may cause errors
- Malformed clock time strings for doseTime or bedtime may fail to parse
- Payment failure or insufficient USDC balance returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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