Zoho Calendar

Access the Zoho Calendar API with managed OAuth authentication. Manage calendars and events with full CRUD operations, including recurring events and attendee management.

Quick Start

# List calendars
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-calendar/api/v1/calendars')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Base URL

https://gateway.maton.ai/zoho-calendar/api/v1/{endpoint}

The gateway proxies requests to

calendar.zoho.com/api/v1

and automatically injects your OAuth token.

Authentication

All requests require the Maton API key in the Authorization header:

Authorization: Bearer $MATON_API_KEY

Environment Variable: Set your API key as

MATON_API_KEY

export MATON_API_KEY="YOUR_API_KEY"

Getting Your API Key

Sign in or create an account at maton.ai
Go to maton.ai/settings
Copy your API key

Connection Management

Manage your Zoho Calendar OAuth connections at

https://ctrl.maton.ai

List Connections

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections?app=zoho-calendar&status=ACTIVE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Connection

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'app': 'zoho-calendar'}).encode()
req = urllib.request.Request('https://ctrl.maton.ai/connections', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "connection": {
    "connection_id": "21fd90f9-5935-43cd-b6c8-bde9d915ca80",
    "status": "ACTIVE",
    "creation_time": "2025-12-08T07:20:53.488460Z",
    "last_updated_time": "2026-01-31T20:03:32.593153Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "zoho-calendar",
    "metadata": {}
  }
}

Open the returned

url

in a browser to complete OAuth authorization.

Delete Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Specifying Connection

If you have multiple Zoho Calendar connections, specify which one to use with the

Maton-Connection

header:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-calendar/api/v1/calendars')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '21fd90f9-5935-43cd-b6c8-bde9d915ca80')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

If omitted, the gateway uses the default (oldest) active connection.

API Reference

Calendars

List Calendars

GET /zoho-calendar/api/v1/calendars

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-calendar/api/v1/calendars')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "calendars": [
    {
      "uid": "fda9b0b4ad834257b622cb3dc3555727",
      "name": "My Calendar",
      "color": "#8cbf40",
      "textcolor": "#FFFFFF",
      "timezone": "PST",
      "isdefault": true,
      "category": "own",
      "privilege": "owner"
    }
  ]
}

Get Calendar Details

GET /zoho-calendar/api/v1/calendars/{calendar_uid}

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-calendar/api/v1/calendars/fda9b0b4ad834257b622cb3dc3555727')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Calendar

POST /zoho-calendar/api/v1/calendars?calendarData={json}

Required Fields:

```
name
```
- Calendar name (max 50 characters)
```
color
```
- Hex color code (e.g.,
```
#FF5733
```
)

Optional Fields:

```
textcolor
```
- Text color hex code
```
description
```
- Calendar description (max 1000 characters)
```
timezone
```
- Calendar timezone
```
include_infreebusy
```
- Show as Busy/Free (boolean)
```
public
```
- Visibility level (
```
disable
```
,
```
freebusy
```
, or
```
view
```
)

Example:

python <<'EOF'
import urllib.request, os, json, urllib.parse
calendarData = {
"name": "Work Calendar",
"color": "#FF5733",
"textcolor": "#FFFFFF",
"description": "My work calendar"
}
url = f'https://gateway.maton.ai/zoho-calendar/api/v1/calendars?calendarData={urllib.parse.quote(json.dumps(calendarData))}&#x27;
req = urllib.request.Request(url, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "calendars": [
    {
      "uid": "86fb9745076e4672ae4324f05e1f5393",
      "name": "Work Calendar",
      "color": "#FF5733",
      "textcolor": "#FFFFFF"
    }
  ]
}

Delete Calendar

DELETE /zoho-calendar/api/v1/calendars/{calendar_uid}

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-calendar/api/v1/calendars/86fb9745076e4672ae4324f05e1f5393', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "calendars": [
    {
      "uid": "86fb9745076e4672ae4324f05e1f5393",
      "calstatus": "deleted"
    }
  ]
}

Events

List Events

GET /zoho-calendar/api/v1/calendars/{calendar_uid}/events?range={json}

Query Parameters:

Parameter	Type	Description
`range`	JSON object	Required. Start and end dates in format `{"start":"yyyyMMdd","end":"yyyyMMdd"}` . Max 31-day span.
`byinstance`	boolean	If true, recurring event instances are returned separately
`timezone`	string	Timezone for datetime values

Example:

python <<'EOF'
import urllib.request, os, json, urllib.parse
from datetime import datetime, timedelta
today = datetime.now()
end_date = today + timedelta(days=7)
range_param = json.dumps({
"start": today.strftime("%Y%m%d"),
"end": end_date.strftime("%Y%m%d")
})
url = f'https://gateway.maton.ai/zoho-calendar/api/v1/calendars/fda9b0b4ad834257b622cb3dc3555727/events?range={urllib.parse.quote(range_param)}&#x27;
req = urllib.request.Request(url)
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "events": [
    {
      "uid": "c63e8b9fcb3e48c2a00b16729932d636@zoho.com",
      "title": "Team Meeting",
      "dateandtime": {
        "timezone": "America/Los_Angeles",
        "start": "20260206T100000-0800",
        "end": "20260206T110000-0800"
      },
      "isallday": false,
      "etag": "1770368451507",
      "organizer": "user@example.com"
    }
  ]
}

Get Event Details

GET /zoho-calendar/api/v1/calendars/{calendar_uid}/events/{event_uid}

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-calendar/api/v1/calendars/fda9b0b4ad834257b622cb3dc3555727/events/c63e8b9fcb3e48c2a00b16729932d636@zoho.com')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Event

POST /zoho-calendar/api/v1/calendars/{calendar_uid}/events?eventdata={json}

Required Fields (in eventdata):

```
dateandtime
```
- Object with
```
start
```
,
```
end
```
, and optionally
```
timezone
```
- Format:
```
yyyyMMdd'T'HHmmss'Z'
```
  (GMT) for timed events
- Format:
```
yyyyMMdd
```
  for all-day events

Optional Fields:

```
title
```
- Event name
```
description
```
- Event details (max 10,000 characters)
```
location
```
- Event location (max 255 characters)
```
isallday
```
- Boolean for all-day events
```
isprivate
```
- Boolean to hide details from non-delegates
```
color
```
- Hex color code
```
attendees
```
- Array of attendee objects
```
reminders
```
- Array of reminder objects
```
rrule
```
- Recurrence rule string (e.g.,
```
FREQ=DAILY;COUNT=5
```
)

Example:

python <<'EOF'
import urllib.request, os, json, urllib.parse
from datetime import datetime, timedelta
start_time = datetime.utcnow() + timedelta(hours=1)
end_time = start_time + timedelta(hours=1)
eventdata = {
"title": "Team Meeting",
"dateandtime": {
"timezone": "America/Los_Angeles",
"start": start_time.strftime("%Y%m%dT%H%M%SZ"),
"end": end_time.strftime("%Y%m%dT%H%M%SZ")
},
"description": "Weekly team sync",
"location": "Conference Room A"
}
url = f'https://gateway.maton.ai/zoho-calendar/api/v1/calendars/fda9b0b4ad834257b622cb3dc3555727/events?eventdata={urllib.parse.quote(json.dumps(eventdata))}&#x27;
req = urllib.request.Request(url, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "events": [
    {
      "uid": "c63e8b9fcb3e48c2a00b16729932d636@zoho.com",
      "title": "Team Meeting",
      "dateandtime": {
        "timezone": "America/Los_Angeles",
        "start": "20260206T100000-0800",
        "end": "20260206T110000-0800"
      },
      "etag": "1770368451507",
      "estatus": "added"
    }
  ]
}

Update Event

PUT /zoho-calendar/api/v1/calendars/{calendar_uid}/events/{event_uid}?eventdata={json}

Required Fields:

```
dateandtime
```
- Start and end times
```
etag
```
- Current etag value (from Get Event Details)

Optional Fields: Same as Create Event

Example:

python <<'EOF'
import urllib.request, os, json, urllib.parse
from datetime import datetime, timedelta
start_time = datetime.utcnow() + timedelta(hours=2)
end_time = start_time + timedelta(hours=1)
eventdata = {
"title": "Updated Team Meeting",
"dateandtime": {
"timezone": "America/Los_Angeles",
"start": start_time.strftime("%Y%m%dT%H%M%SZ"),
"end": end_time.strftime("%Y%m%dT%H%M%SZ")
},
"etag": 1770368451507
}
url = f'https://gateway.maton.ai/zoho-calendar/api/v1/calendars/fda9b0b4ad834257b622cb3dc3555727/events/c63e8b9fcb3e48c2a00b16729932d636@zoho.com?eventdata={urllib.parse.quote(json.dumps(eventdata))}&#x27;
req = urllib.request.Request(url, method='PUT')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Delete Event

DELETE /zoho-calendar/api/v1/calendars/{calendar_uid}/events/{event_uid}

Required Header:

```
etag
```
- Current etag value of the event

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/zoho-calendar/api/v1/calendars/fda9b0b4ad834257b622cb3dc3555727/events/c63e8b9fcb3e48c2a00b16729932d636@zoho.com&#x27;, method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('etag', '1770368451507')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "events": [
    {
      "uid": "c63e8b9fcb3e48c2a00b16729932d636@zoho.com",
      "estatus": "deleted",
      "caluid": "fda9b0b4ad834257b622cb3dc3555727"
    }
  ]
}

Attendees

When creating or updating events, include attendees:

{
  "attendees": [
    {
      "email": "user@example.com",
      "permission": 1,
      "attendance": 1
    }
  ]
}

Permission levels: 0 (Guest), 1 (View), 2 (Invite), 3 (Edit) Attendance: 0 (Non-participant), 1 (Required), 2 (Optional)

Reminders

{
  "reminders": [
    {
      "action": "popup",
      "minutes": 30
    },
    {
      "action": "email",
      "minutes": 60
    }
  ]
}

Actions:

email

popup

notification

Recurring Events

Use the

rrule

field with iCalendar RRULE format:

{
  "rrule": "FREQ=DAILY;COUNT=5;INTERVAL=1"
}

Examples:

Daily for 5 days:
```
FREQ=DAILY;COUNT=5;INTERVAL=1
```

Weekly on Mon/Tue:

FREQ=WEEKLY;INTERVAL=1;BYDAY=MO,TU;UNTIL=20250817T064600Z

Monthly last Tuesday:

FREQ=MONTHLY;INTERVAL=1;BYDAY=TU;BYSETPOS=-1;COUNT=2

Code Examples

JavaScript

const response = await fetch(
  'https://gateway.maton.ai/zoho-calendar/api/v1/calendars',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);
const data = await response.json();

Python

import os
import requests
response = requests.get(
'https://gateway.maton.ai/zoho-calendar/api/v1/calendars&#x27;,
headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'}
)
data = response.json()

Notes

Event and calendar data is passed as JSON in the
```
eventdata
```
or
```
calendarData
```
query parameter
Date/time format for events:
```
yyyyMMdd'T'HHmmss'Z'
```
(GMT) or
```
yyyyMMdd
```
for all-day events
The
```
range
```
parameter for listing events cannot exceed 31 days
The
```
etag
```
is required for update and delete operations - always get the latest etag before modifying
For delete operations, the
```
etag
```
must be passed as a header, not a query parameter
IMPORTANT: When using curl commands, use
```
curl -g
```
when URLs contain brackets to disable glob parsing
IMPORTANT: When piping curl output to
```
jq
```
or other commands, environment variables like
```
$MATON_API_KEY
```
may not expand correctly in some shell environments

Error Handling

Status	Meaning
400	Missing Zoho Calendar connection, missing required parameter, or invalid request
401	Invalid or missing Maton API key, or OAuth scope mismatch
404	Resource not found
429	Rate limited
4xx/5xx	Passthrough error from Zoho Calendar API

Common Errors

Error	Description
`ETAG_MISSING`	etag header required for delete operations
`EXTRA_PARAM_FOUND`	Invalid parameter in request
`INVALID_DATA`	Malformed request data

Troubleshooting: API Key Issues

Check that the
```
MATON_API_KEY
```
environment variable is set:

echo $MATON_API_KEY

Verify the API key is valid by listing connections:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Troubleshooting: Invalid App Name

Ensure your URL path starts with
```
zoho-calendar
```
. For example:

Correct:

https://gateway.maton.ai/zoho-calendar/api/v1/calendars

Incorrect:

https://gateway.maton.ai/api/v1/calendars

Zoho Calendar

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Zoho Calendar

Quick Start

Base URL

Authentication

Getting Your API Key

Connection Management

List Connections

Create Connection

Get Connection

Delete Connection

Specifying Connection

API Reference

Calendars

List Calendars

Get Calendar Details

Create Calendar

Delete Calendar

Events

List Events

Get Event Details

Create Event

Update Event

Delete Event

Attendees

Reminders

Recurring Events

Code Examples

JavaScript

Python

Notes

Error Handling

Common Errors

Troubleshooting: API Key Issues

Troubleshooting: Invalid App Name

Resources

Quick Start

Manual Installation

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