Gmail

Gmail

Access the Gmail API with managed OAuth authentication. Read, send, and manage emails, threads, labels, and drafts.

Quick Start

# List messages
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/google-mail/gmail/v1/users/me/messages?maxResults=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/google-mail/{native-api-path}

Replace {native-api-path} with the actual Gmail API endpoint path. The gateway proxies requests to gmail.googleapis.com and automatically injects your OAuth token.

IMPORTANT: The URL path MUST start with the connection's app name (eg. /google-mail/...). This prefix tells the gateway which app connection to use. For example, the native Gmail API path starts with gmail/v1/, so full paths look like /google-mail/gmail/v1/users/me/messages.

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

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

Connection Management

Manage your Google 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=google-mail&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': 'google-mail'}).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": "google-mail",
    "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 Gmail 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/google-mail/gmail/v1/users/me/messages')
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

List Messages

GET /google-mail/gmail/v1/users/me/messages?maxResults=10

With query filter:

GET /google-mail/gmail/v1/users/me/messages?q=is:unread&maxResults=10

Get Message

GET /google-mail/gmail/v1/users/me/messages/{messageId}

With metadata only:

GET /google-mail/gmail/v1/users/me/messages/{messageId}?format=metadata&metadataHeaders=From&metadataHeaders=Subject&metadataHeaders=Date

Send Message

POST /google-mail/gmail/v1/users/me/messages/send
Content-Type: application/json

{
  "raw": "BASE64_ENCODED_EMAIL"
}

List Labels

GET /google-mail/gmail/v1/users/me/labels

List Threads

GET /google-mail/gmail/v1/users/me/threads?maxResults=10

Get Thread

GET /google-mail/gmail/v1/users/me/threads/{threadId}

Modify Message Labels

POST /google-mail/gmail/v1/users/me/messages/{messageId}/modify
Content-Type: application/json

{
  "addLabelIds": ["STARRED"],
  "removeLabelIds": ["UNREAD"]
}

Trash Message

POST /google-mail/gmail/v1/users/me/messages/{messageId}/trash

Create Draft

POST /google-mail/gmail/v1/users/me/drafts
Content-Type: application/json

{
  "message": {
    "raw": "BASE64URL_ENCODED_EMAIL"
  }
}

Send Draft

POST /google-mail/gmail/v1/users/me/drafts/send
Content-Type: application/json

{
  "id": "{draftId}"
}

Get Profile

GET /google-mail/gmail/v1/users/me/profile

Query Operators

Use in the q parameter:

• is:unread - Unread messages
• is:starred - Starred messages
• from:email@example.com - From specific sender
• to:email@example.com - To specific recipient
• subject:keyword - Subject contains keyword
• after:2024/01/01 - After date
• before:2024/12/31 - Before date
• has:attachment - Has attachments

Code Examples

JavaScript

const response = await fetch(
  'https://gateway.maton.ai/google-mail/gmail/v1/users/me/messages?maxResults=10',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);

Python

import os
import requests

response = requests.get(
    'https://gateway.maton.ai/google-mail/gmail/v1/users/me/messages',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'},
    params={'maxResults': 10, 'q': 'is:unread'}
)

Notes

• Use me as userId for the authenticated user
• Message body is base64url encoded in the raw field
• Common labels: INBOX, SENT, DRAFT, STARRED, UNREAD, TRASH
• IMPORTANT: When using curl commands, use curl -g when URLs contain brackets (fields[], sort[], records[]) 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. You may get "Invalid API key" errors when piping.

Error Handling

Troubleshooting: Invalid API Key

When you receive a "Invalid API key" error, ALWAYS follow these steps before concluding there is an issue:

1. Check that the MATON_API_KEY environment variable is set:

echo $MATON_API_KEY

2. 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: Missing app connection for {app} or Invalid app name: {app}

When you receive a "Missing app connection for {app}" or "Invalid app name: {app}" error, check the following:

1. Verify your URL path starts with the correct app name. The path must begin with /google-mail/. For example:

• Correct: https://gateway.maton.ai/google-mail/gmail/v1/users/me/messages
• Incorrect: https://gateway.maton.ai/gmail/v1/users/me/messages

2. Ensure you have an active connection for the app. List your connections to verify:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections?app=google-mail&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

3. If no active connection exists, create one and complete the OAuth flow (see Create Connection).

Resources

• Gmail API Overview
• List Messages
• Get Message
• Send Message
• List Threads
• List Labels
• Create Draft