Integration
Connect lemlist to The Calendar
When something happens in lemlist, your agent does the next thing in The Calendar. Describe it in plain language and the automation is built, tested on every branch and kept running.
Build it
What do you want lemlist and The Calendar to do together?
Describe it and your agent reads both APIs, builds the automation, tests every branch and ships it. The list below is what exists today, not the limit.
Ask the assistant
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Or work from Claude Code
Install the APIANT plugin for Claude Code and build, edit, test and read run history from your terminal. Every plan gets this, including free, and it spends no assistant credits.
Connect Claude CodeEverything your agent can do with lemlist and The Calendar
Triggers and actions 1 trigger ยท 13 actions
Trigger
New ActivityTriggers when an activity has ocurred. It can be an email has been sent, replied to, bounced, or unsubscribed from or v3 new activity like a LinkedIn profile have been visited or a phone call just ended.
- Add Recipient to Unsubscribe List
Add a recipient to the unsubscribe list.
- Mark a Lead From All Campaigns as Interested
Mark a Lead From All Campaigns as Interested.
- Mark a Lead From One Campaign as Interested
Mark a Lead From One Campaign as Interested.
- Remove Lead From Campaign
Remove a Lead from a campaign.
- Remove Lead From Unsubscribe
Remove a Lead from unsubscribe.
- Resume Lead From All or Specific Campaigns
Resume Lead From All or Specific Campaigns.
- Search Lead
Search a lead.
- Update Lead From Campaign
Update Lead From Campaign.
Action
Get country holidaysReturn the list of public holidays for a given country and year. GET https://the-calendar.net/api/holidays/by-country/{country-slug}/{year}.json (~30 countries, 2026 published, e.g. united-kingdom, canada, australia, germany, japan). Response: {country, kind, year, source, holidays:[{name,date,observed,weekday,note}]}. No auth.
- Get finance calendar
Return a US finance-related date calendar for a given year and calendar type: fomc (Fed meeting dates), tax-deadlines, or market-holidays (stock market closures). GET https://the-calendar.net/api/finance/{fomc|tax-deadlines|market-holidays}/{year}.json. No auth.
- Get sports schedule
Return key schedule/calendar dates for a sports league or team. GET https://the-calendar.net/api/sports/{slug}.json where slug is one of: nfl-schedule, nba-schedule, mlb-schedule, nhl-schedule, mls-schedule, premier-league-schedule, la-liga-schedule, champions-league-schedule, f1-2026-calendar, real-madrid-calendar, fc-barcelona-calendar, manchester-united-calendar. No auth.
- Get US federal holidays
Return the list of US federal holidays for a given year. GET https://the-calendar.net/api/holidays/us-federal/{year}.json (years 2025-2028 published). Response: {country, kind, year, source, holidays:[{name,date,observed,weekday,note}]}. No auth.
- Get US state holidays
Return the list of state-observed holidays for a given US state and year. GET https://the-calendar.net/api/holidays/by-state/{state-slug}/{year}.json (all 50 states, 2026 published). Response: {country, kind, year, source, holidays:[{name,date,observed,weekday,note}]}. No auth.
No trigger or action matches that. Ask your agent to add it: it reads the API documentation and builds what you describe.
Each app on its own
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