ManyLives Free Slots Calculator

x402

ManyLives Free Slots Calculator is a paid API for AI agents from api.manylives.me, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-13).

Calculates available appointment slots from weekly hours and existing bookings, respecting buffers, holidays, and timezone

Price / call$0.002

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StatusUnknown

How this service works

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Output

Returns a JSON object with: a list of available slots (each with start_local, end_local, start_utc, and weekday), a list of closed dates with reasons (e.g. closed on Sundays, public holidays), a per-day count of available slots, and the timezone used.

Example use cases

Booking page for a freelance consultant

“I need to show clients available 60-minute slots for the next 7 days starting today. My hours are Mon-Fri 09:00-18:00, with a 15-minute buffer before and after each session, in the Europe/London timezone. I already have calls booked from 10:00-11:00 and 14:00-15:00 on Monday. What slots are free?”

Auto-scheduling for a medical clinic

“Calculate open 30-minute appointment slots for the next 3 days from 2026-11-10, for a clinic in Australia/Sydney open Mon-Sat 08:00-17:00 (closed Sundays), with a 10-minute buffer around each booking and Australian national holidays blocked. Existing bookings: Nov 10 09:00-09:30 and Nov 11 13:00-13:30.”

AI agent booking assistant for a hair salon

“What 45-minute slots are available at my salon over the next 5 days starting 2026-11-03? We're open Tuesday through Saturday 10:00-19:00 and closed on Sundays and Mondays, with a 15-minute buffer between appointments, in the America/Chicago timezone. We have bookings on Nov 3 at 10:00-10:45 and Nov 5 at 14:00-14:45.”

Technical details

Endpoint

POSThttps://api.manylives.me/paid/calendar/free-slots?utm_source=zero.xyz

When to prefer

Use this endpoint when you need to compute available appointment slots server-side from a set of weekly hours and existing bookings, without requiring a full calendar integration. Ideal for AI scheduling agents, booking widgets, or any workflow where you pass raw availability rules and busy times and need structured free-slot output with timezone-correct UTC and local times. Prefer over calendar API integrations when you don't need to read/write events directly from Google Calendar or Outlook.

Side effects

Missing required fields (timezone, hours, duration_minutes) return an error
Invalid IANA timezone string causes rejection
Malformed busy booking timestamps cause parsing errors
Requesting more than 500 max_slots returns a validation error
Invalid step_minutes outside 5-120 range causes rejection
All requested days are closed or fully booked returns empty slots array

Input

Schema · Request body

Field	Type	Description
busy	string	existing bookings [{start, end}]: ISO times with offset, or local 'YYYY-MM-DD HH:MM'
days	string	optional 1-31 (default 7)
from	string	optional first local date YYYY-MM-DD (default today there)
hours	string	weekly hours, e.g. {"mon": "09:00-17:00", "tue": "09:00-12:00,13:00-17:00", "sun": "closed"} (required; missing days are closed)
timezone	string	IANA time zone, e.g. Australia/Sydney (required)
max_slots	string	optional 1-500 (default 100)
closed_dates	string	optional ['2026-12-24', ...]
step_minutes	string	optional slot spacing 5-120 (default 15)
buffer_minutes	string	optional gap kept before and after bookings (default 0)
duration_minutes	string	service length, 5-480 (required)
holidays_country	string	optional 2-letter code to close on national public holidays
min_notice_minutes	string	optional earliest bookable time from now (default 0)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "slots": [
      {
        "weekday": "Wed",
        "end_local": "2026-10-14 09:45",
        "start_utc": "2026-10-13T22:00:00.000Z",
        "start_local": "2026-10-14 09:00"
      }
    ],
    "closed": [
      {
        "why": "closed on Sundays",
        "date": "2026-10-18"
      }
    ],
    "per_day": {
      "2026-10-14": 9
    },
    "timezone": "Australia/Sydney"
  }
}

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