Kit

Access the Kit (formerly ConvertKit) API with managed OAuth authentication. Manage subscribers, tags, forms, sequences, broadcasts, custom fields, and webhooks.

Quick Start

# List subscribers
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/kit/v4/subscribers?per_page=10')
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/kit/{native-api-path}

Replace

{native-api-path}

with the actual Kit API endpoint path. The gateway proxies requests to

api.kit.com

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 Kit 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=kit&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': 'kit'}).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": "cb2025b3-706f-4b5d-87a5-c6809c0c7ec4",
    "status": "ACTIVE",
    "creation_time": "2026-02-07T00:04:08.476727Z",
    "last_updated_time": "2026-02-07T00:05:58.001964Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "kit",
    "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 Kit 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/kit/v4/subscribers')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', 'cb2025b3-706f-4b5d-87a5-c6809c0c7ec4')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

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

API Reference

Subscribers

List Subscribers

GET /kit/v4/subscribers

Query parameters:

```
per_page
```
- Results per page (default: 500, max: 1000)
```
after
```
- Cursor for next page
```
before
```
- Cursor for previous page

status

- Filter by:

active

inactive

bounced

complained

cancelled

, or

all

```
email_address
```
- Filter by specific email
```
created_after
```
/
```
created_before
```
- Filter by creation date (yyyy-mm-dd)
```
updated_after
```
/
```
updated_before
```
- Filter by update date (yyyy-mm-dd)
```
include_total_count
```
- Include total count (slower)

Response:

{
  "subscribers": [
    {
      "id": 3914682852,
      "first_name": "Test User",
      "email_address": "test@example.com",
      "state": "active",
      "created_at": "2026-02-07T00:42:54Z",
      "fields": {"company": null}
    }
  ],
  "pagination": {
    "has_previous_page": false,
    "has_next_page": false,
    "start_cursor": "WzE0OV0=",
    "end_cursor": "WzE0OV0=",
    "per_page": 500
  }
}

Get Subscriber

GET /kit/v4/subscribers/{id}

Create Subscriber

POST /kit/v4/subscribers
Content-Type: application/json

{
"email_address": "user@example.com",
"first_name": "John"
}

Update Subscriber

PUT /kit/v4/subscribers/{id}
Content-Type: application/json
{
"first_name": "Updated Name"
}

Forms

List Forms

GET /kit/v4/forms

Query parameters:

```
per_page
```
,
```
after
```
,
```
before
```
,
```
include_total_count
```
```
status
```
- Filter by:
```
active
```
,
```
archived
```
,
```
trashed
```
, or
```
all
```
```
type
```
-
```
embed
```
for embedded forms,
```
hosted
```
for landing pages

Response:

{
  "forms": [
    {
      "id": 9061198,
      "name": "Creator Profile",
      "created_at": "2026-02-07T00:00:32Z",
      "type": "embed",
      "format": null,
      "embed_js": "https://chris-kim-2.kit.com/c682763b07/index.js",
      "embed_url": "https://chris-kim-2.kit.com/c682763b07",
      "archived": false,
      "uid": "c682763b07"
    }
  ],
  "pagination": {...}
}

Add Subscriber to Form

POST /kit/v4/forms/{form_id}/subscribers
Content-Type: application/json
{
"email_address": "user@example.com"
}

List Form Subscribers

GET /kit/v4/forms/{form_id}/subscribers

Sequences

List Sequences

GET /kit/v4/sequences

Response:

{
  "sequences": [
    {
      "id": 123,
      "name": "Welcome Sequence",
      "hold": false,
      "repeat": false,
      "created_at": "2026-01-01T00:00:00Z"
    }
  ],
  "pagination": {...}
}

Add Subscriber to Sequence

POST /kit/v4/sequences/{sequence_id}/subscribers
Content-Type: application/json
{
"email_address": "user@example.com"
}

List Sequence Subscribers

GET /kit/v4/sequences/{sequence_id}/subscribers

Broadcasts

List Broadcasts

GET /kit/v4/broadcasts

Query parameters:

per_page

after

before

include_total_count

Response:

{
  "broadcasts": [
    {
      "id": 123,
      "publication_id": 456,
      "created_at": "2026-02-07T00:00:00Z",
      "subject": "My Broadcast",
      "preview_text": "Preview...",
      "content": "<p>Content</p>",
      "public": false,
      "published_at": null,
      "send_at": null,
      "email_template": {"id": 123, "name": "Text only"}
    }
  ],
  "pagination": {...}
}

Segments

List Segments

GET /kit/v4/segments

Query parameters:

per_page

after

before

include_total_count

Custom Fields

List Custom Fields

GET /kit/v4/custom_fields

Response:

{
  "custom_fields": [
    {
      "id": 1192946,
      "name": "ck_field_1192946_company",
      "key": "company",
      "label": "Company"
    }
  ],
  "pagination": {...}
}

Create Custom Field

POST /kit/v4/custom_fields
Content-Type: application/json

{
"label": "Company"
}

Update Custom Field

PUT /kit/v4/custom_fields/{id}
Content-Type: application/json
{
"label": "Company Name"
}

Delete Custom Field

DELETE /kit/v4/custom_fields/{id}

Returns 204 No Content on success.

Purchases

List Purchases

GET /kit/v4/purchases

Query parameters:

per_page

after

before

include_total_count

Email Templates

List Email Templates

GET /kit/v4/email_templates

Response:

{
  "email_templates": [
    {
      "id": 4956167,
      "name": "Text only",
      "is_default": true,
      "category": "Classic"
    }
  ],
  "pagination": {...}
}

Webhooks

List Webhooks

GET /kit/v4/webhooks

Create Webhook

POST /kit/v4/webhooks
Content-Type: application/json
{
"target_url": "https://example.com/webhook",
"event": {"name": "subscriber.subscriber_activate"}
}

Response:

{
  "webhook": {
    "id": 5291560,
    "account_id": 2596262,
    "event": {
      "name": "subscriber_activate",
      "initiator_value": null
    },
    "target_url": "https://example.com/webhook"
  }
}

Delete Webhook

DELETE /kit/v4/webhooks/{id}

Returns 204 No Content on success.

Pagination

Kit uses cursor-based pagination. Use

after

and

before

query parameters with cursor values from the response.

GET /kit/v4/subscribers?per_page=100&after=WzE0OV0=

Response includes pagination info:

{
  "subscribers": [...],
  "pagination": {
    "has_previous_page": false,
    "has_next_page": true,
    "start_cursor": "WzE0OV0=",
    "end_cursor": "WzI0OV0=",
    "per_page": 100
  }
}

Code Examples

JavaScript

const response = await fetch(
  'https://gateway.maton.ai/kit/v4/subscribers?per_page=10',
  {
    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/kit/v4/subscribers&#x27;,
headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'},
params={'per_page': 10}
)
data = response.json()

Notes

Kit API uses V4 (V3 is deprecated)
Subscriber IDs are integers
Custom field keys are auto-generated from labels
Bulk operations (>100 items) are processed asynchronously
Delete operations return 204 No Content with empty body
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 Kit connection
401	Invalid or missing Maton API key
403	Insufficient permissions (check OAuth scopes)
404	Resource not found
429	Rate limited
4xx/5xx	Passthrough error from Kit API

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
```
kit
```
. For example:

Correct:

https://gateway.maton.ai/kit/v4/subscribers

Incorrect:
```
https://gateway.maton.ai/v4/subscribers
```

Kit

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Be Part of the 0+ Developer Community

Kit

Quick Start

Base URL

Authentication

Getting Your API Key

Connection Management

List Connections

Create Connection

Get Connection

Delete Connection

Specifying Connection

API Reference

Subscribers

List Subscribers

Get Subscriber

Create Subscriber

Update Subscriber

Tags

List Tags

Create Tag

Update Tag

Delete Tag

Tag a Subscriber

Remove Tag from Subscriber

List Subscribers with Tag

Forms

List Forms

Add Subscriber to Form

List Form Subscribers

Sequences

List Sequences

Add Subscriber to Sequence

List Sequence Subscribers

Broadcasts

List Broadcasts

Segments

List Segments

Custom Fields

List Custom Fields

Create Custom Field

Update Custom Field

Delete Custom Field

Purchases

List Purchases

Email Templates

List Email Templates

Webhooks

List Webhooks

Create Webhook

Delete Webhook

Pagination

Code Examples

JavaScript

Python

Notes

Error Handling

Troubleshooting: API Key Issues

Troubleshooting: Invalid App Name

Resources

Quick Start

Manual Installation

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