Basecamp

Access the Basecamp 4 API with managed OAuth authentication. Manage projects, to-dos, messages, schedules, documents, and team collaboration.

Quick Start

# List all projects
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/basecamp/projects.json')
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/basecamp/{resource}.json

The gateway proxies requests to

3.basecampapi.com/{account_id}/

and automatically injects your OAuth token and account ID.

Important: All Basecamp API URLs must end with

.json

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 Basecamp 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=basecamp&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': 'basecamp'}).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": "71e313c8-9100-48c6-8ea1-6323f6fafd04",
    "status": "ACTIVE",
    "creation_time": "2026-02-08T03:12:39.815086Z",
    "last_updated_time": "2026-02-08T03:12:59.259878Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "basecamp",
    "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 Basecamp 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/basecamp/projects.json')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '71e313c8-9100-48c6-8ea1-6323f6fafd04')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

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

API Reference

User Info

Get Current User

GET /basecamp/my/profile.json

Response:

{
  "id": 51197030,
  "name": "Chris Kim",
  "email_address": "chris@example.com",
  "admin": true,
  "owner": true,
  "time_zone": "America/Los_Angeles",
  "avatar_url": "https://..."
}

People Operations

List People

GET /basecamp/people.json

Response:

[
  {
    "id": 51197030,
    "name": "Chris Kim",
    "email_address": "chris@example.com",
    "admin": true,
    "owner": true,
    "employee": true,
    "time_zone": "America/Los_Angeles"
  }
]

Get Person

GET /basecamp/people/{person_id}.json

List Project Members

GET /basecamp/projects/{project_id}/people.json

Project Operations

List Projects

GET /basecamp/projects.json

Response:

[
  {
    "id": 46005636,
    "status": "active",
    "name": "Getting Started",
    "description": "Quickly get up to speed with everything Basecamp",
    "created_at": "2026-02-05T22:59:26.087Z",
    "url": "https://3.basecampapi.com/6153810/projects/46005636.json",
    "dock": [...]
  }
]

Get Project

GET /basecamp/projects/{project_id}.json

The project response includes a

dock

array with available tools (message_board, todoset, vault, chat, schedule, etc.). Each dock item has:

```
id
```
: The tool's ID
```
name
```
: Tool type (e.g., "todoset", "message_board")
```
enabled
```
: Whether the tool is active
```
url
```
: Direct URL to access the tool

Create Project

POST /basecamp/projects.json
Content-Type: application/json

{
"name": "New Project",
"description": "Project description"
}

Update Project

PUT /basecamp/projects/{project_id}.json
Content-Type: application/json
{
"name": "Updated Project Name",
"description": "Updated description"
}

Delete (Trash) Project

DELETE /basecamp/projects/{project_id}.json

To-Do Operations

Get Todoset

First, get the todoset ID from the project's dock:

GET /basecamp/buckets/{project_id}/todosets/{todoset_id}.json

List Todolists

GET /basecamp/buckets/{project_id}/todosets/{todoset_id}/todolists.json

Response:

[
  {
    "id": 9550474442,
    "title": "Basecamp essentials",
    "description": "",
    "completed": false,
    "completed_ratio": "0/5",
    "url": "https://..."
  }
]

Create Todolist

POST /basecamp/buckets/{project_id}/todosets/{todoset_id}/todolists.json
Content-Type: application/json
{
"name": "New Todo List",
"description": "List description"
}

Get Todolist

GET /basecamp/buckets/{project_id}/todolists/{todolist_id}.json

List Todos

GET /basecamp/buckets/{project_id}/todolists/{todolist_id}/todos.json

Response:

[
  {
    "id": 9550474446,
    "content": "Start here",
    "description": "",
    "completed": false,
    "due_on": null,
    "assignees": []
  }
]

Create Todo

POST /basecamp/buckets/{project_id}/todolists/{todolist_id}/todos.json
Content-Type: application/json
{
"content": "New todo item",
"description": "Todo description",
"due_on": "2026-02-15",
"assignee_ids": [51197030]
}

Response:

{
  "id": 9555973289,
  "content": "New todo item",
  "completed": false
}

Update Todo

PUT /basecamp/buckets/{project_id}/todos/{todo_id}.json
Content-Type: application/json
{
"content": "Updated todo",
"description": "Updated description"
}

Complete Todo

POST /basecamp/buckets/{project_id}/todos/{todo_id}/completion.json

Returns 204 on success.

Uncomplete Todo

DELETE /basecamp/buckets/{project_id}/todos/{todo_id}/completion.json

Message Board Operations

Get Message Board

GET /basecamp/buckets/{project_id}/message_boards/{message_board_id}.json

List Messages

GET /basecamp/buckets/{project_id}/message_boards/{message_board_id}/messages.json

Create Message

POST /basecamp/buckets/{project_id}/message_boards/{message_board_id}/messages.json
Content-Type: application/json
{
"subject": "Message Subject",
"content": "<p>Message body with HTML</p>",
"category_id": 123
}

Get Message

GET /basecamp/buckets/{project_id}/messages/{message_id}.json

Update Message

PUT /basecamp/buckets/{project_id}/messages/{message_id}.json
Content-Type: application/json
{
"subject": "Updated Subject",
"content": "<p>Updated content</p>"
}

Schedule Operations

Get Schedule

GET /basecamp/buckets/{project_id}/schedules/{schedule_id}.json

List Schedule Entries

GET /basecamp/buckets/{project_id}/schedules/{schedule_id}/entries.json

Create Schedule Entry

POST /basecamp/buckets/{project_id}/schedules/{schedule_id}/entries.json
Content-Type: application/json
{
"summary": "Team Meeting",
"description": "Weekly sync",
"starts_at": "2026-02-15T14:00:00Z",
"ends_at": "2026-02-15T15:00:00Z",
"all_day": false,
"participant_ids": [51197030]
}

Update Schedule Entry

PUT /basecamp/buckets/{project_id}/schedule_entries/{entry_id}.json
Content-Type: application/json
{
"summary": "Updated Meeting",
"starts_at": "2026-02-15T15:00:00Z",
"ends_at": "2026-02-15T16:00:00Z"
}

Vault (Documents & Files) Operations

Get Vault

GET /basecamp/buckets/{project_id}/vaults/{vault_id}.json

List Documents in Vault

GET /basecamp/buckets/{project_id}/vaults/{vault_id}/documents.json

Create Document

POST /basecamp/buckets/{project_id}/vaults/{vault_id}/documents.json
Content-Type: application/json
{
"title": "Document Title",
"content": "<p>Document content with HTML</p>"
}

List Uploads in Vault

GET /basecamp/buckets/{project_id}/vaults/{vault_id}/uploads.json

Campfire (Chat) Operations

List All Campfires

GET /basecamp/chats.json

Get Campfire

GET /basecamp/buckets/{project_id}/chats/{chat_id}.json

List Campfire Lines (Messages)

GET /basecamp/buckets/{project_id}/chats/{chat_id}/lines.json

Create Campfire Line

POST /basecamp/buckets/{project_id}/chats/{chat_id}/lines.json
Content-Type: application/json
{
"content": "Hello from the API!"
}

Comments Operations

List Comments on Recording

GET /basecamp/buckets/{project_id}/recordings/{recording_id}/comments.json

Create Comment

POST /basecamp/buckets/{project_id}/recordings/{recording_id}/comments.json
Content-Type: application/json
{
"content": "<p>Comment text</p>"
}

Recording Status Operations

All content items (todos, messages, documents, etc.) are "recordings" that can be archived or trashed.

Trash Recording

PUT /basecamp/buckets/{project_id}/recordings/{recording_id}/status/trashed.json

Archive Recording

PUT /basecamp/buckets/{project_id}/recordings/{recording_id}/status/archived.json

Unarchive Recording

PUT /basecamp/buckets/{project_id}/recordings/{recording_id}/status/active.json

Templates Operations

List Templates

GET /basecamp/templates.json

Create Project from Template

POST /basecamp/templates/{template_id}/project_constructions.json
Content-Type: application/json

{
"name": "New Project from Template",
"description": "Description"
}

Pagination

Basecamp uses Link header pagination with

rel="next"

Response Headers:

Link: <https://3.basecampapi.com/.../page=2>; rel="next"
X-Total-Count: 150

Follow the

Link

header URL for the next page. When

next

is absent, you've reached the last page.

Important: Do not construct pagination URLs manually. Always use the URL provided in the

Link

header.

Key Concepts

Buckets and Projects

A "bucket" is a project's content container. The bucket ID is the same as the project ID in URLs:

/buckets/{project_id}/todosets/{todoset_id}.json

Dock

Each project has a "dock" containing available tools. Always check that a tool is

enabled: true

before using it:

{
  "dock": [
    {"name": "todoset", "id": 123, "enabled": true},
    {"name": "message_board", "id": 456, "enabled": false}
  ]
}

Recordings

All content items (todos, messages, documents, comments, etc.) are "recordings" with:

```
status
```
: "active", "archived", or "trashed"
```
parent
```
: navigation to container
Unique IDs that can be used across endpoints

Code Examples

JavaScript

const response = await fetch(
  'https://gateway.maton.ai/basecamp/projects.json',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);
const projects = await response.json();

Python

import os
import requests
response = requests.get(
'https://gateway.maton.ai/basecamp/projects.json&#x27;,
headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'}
)
projects = response.json()

Notes

All API paths must end with
```
.json
```
The gateway automatically injects the account ID
Uses Basecamp 4 API (bc3-api)
Timestamps are in ISO 8601 format
HTML content uses
```
<div>
```
,
```
<p>
```
,
```
<strong>
```
,
```
<em>
```
,
```
<a>
```
,
```
<ul>
```
,
```
<ol>
```
,
```
<li>
```
tags
Rate limit: ~50 requests per 10 seconds per IP
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 Basecamp connection or bad request
401	Invalid or missing Maton API key
404	Resource not found, deleted, or no access
429	Rate limited (check Retry-After header)
507	Account limit reached (e.g., project limit)
5xx	Server error (retry with exponential backoff)

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
```
basecamp
```
. For example:

Correct:

https://gateway.maton.ai/basecamp/projects.json

Incorrect:
```
https://gateway.maton.ai/projects.json
```

Basecamp

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Basecamp

Quick Start

Base URL

Authentication

Getting Your API Key

Connection Management

List Connections

Create Connection

Get Connection

Delete Connection

Specifying Connection

API Reference

User Info

Get Current User

People Operations

List People

Get Person

List Project Members

Project Operations

List Projects

Get Project

Create Project

Update Project

Delete (Trash) Project

To-Do Operations

Get Todoset

List Todolists

Create Todolist

Get Todolist

List Todos

Create Todo

Update Todo

Complete Todo

Uncomplete Todo

Message Board Operations

Get Message Board

List Messages

Create Message

Get Message

Update Message

Schedule Operations

Get Schedule

List Schedule Entries

Create Schedule Entry

Update Schedule Entry

Vault (Documents & Files) Operations

Get Vault

List Documents in Vault

Create Document

List Uploads in Vault

Campfire (Chat) Operations

List All Campfires

Get Campfire

List Campfire Lines (Messages)

Create Campfire Line

Comments Operations

List Comments on Recording

Create Comment

Recording Status Operations

Trash Recording

Archive Recording

Unarchive Recording

Templates Operations

List Templates

Create Project from Template

Pagination

Key Concepts

Buckets and Projects

Dock

Recordings

Code Examples

JavaScript

Python

Notes

Error Handling

Troubleshooting: API Key Issues

Troubleshooting: Invalid App Name