Instantly

Access the Instantly API v2 with managed authentication. Manage cold email campaigns, leads, sending accounts, and view analytics.

Quick Start

# List campaigns
python \x3C\x3C'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/instantly/api/v2/campaigns?limit=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/instantly/{native-api-path}

Replace {native-api-path} with the actual Instantly API endpoint path. The gateway proxies requests to api.instantly.ai and automatically injects your API key.

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 Instantly connections at https://ctrl.maton.ai.

List Connections

python \x3C\x3C'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections?app=instantly&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 \x3C\x3C'EOF'
import urllib.request, os, json
data = json.dumps({'app': 'instantly'}).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 \x3C\x3C'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": "e4dca622-b9cf-4ed6-b52e-fa681345f5ac",
    "status": "ACTIVE",
    "creation_time": "2026-02-11T22:19:35.798712Z",
    "last_updated_time": "2026-02-11T22:20:15.702846Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "instantly",
    "metadata": {}
  }
}

Open the returned url in a browser to complete authorization.

Delete Connection

python \x3C\x3C'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 Instantly connections, specify which one to use with the Maton-Connection header:

python \x3C\x3C'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/instantly/api/v2/campaigns')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', 'e4dca622-b9cf-4ed6-b52e-fa681345f5ac')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

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

API Reference

Campaigns

List Campaigns

GET /instantly/api/v2/campaigns?limit=10&status=1&search=keyword

Query parameters:

• limit - Number of results (default: 10)
• status - Campaign status filter (0=draft, 1=active, 2=paused, 3=completed)
• search - Search by campaign name
• starting_after - Cursor for pagination

Get Campaign

GET /instantly/api/v2/campaigns/{campaign_id}

Create Campaign

POST /instantly/api/v2/campaigns
Content-Type: application/json

{
  "name": "My Campaign",
  "campaign_schedule": {
    "schedules": [
      {
        "name": "My Schedule",
        "timing": {
          "from": "09:00",
          "to": "17:00"
        },
        "days": {
          "0": true,
          "1": true,
          "2": true,
          "3": true,
          "4": true
        },
        "timezone": "Etc/GMT+5"
      }
    ]
  }
}

Note: Timezone must use Etc/GMT format (e.g., "Etc/GMT+5", "Etc/GMT-8", "Etc/GMT+12").

#### Activate Campaign

```bash
POST /instantly/api/v2/campaigns/{campaign_id}/activate

Pause Campaign

POST /instantly/api/v2/campaigns/{campaign_id}/pause

Delete Campaign

DELETE /instantly/api/v2/campaigns/{campaign_id}

Search Campaigns by Lead Email

GET /instantly/api/v2/campaigns/[email protected]

Leads

Create Lead

POST /instantly/api/v2/leads
Content-Type: application/json

{
  "campaign_id": "019bb3bd-9963-789e-b776-6c6927ef3f79",
  "email": "[email protected]",
  "first_name": "John",
  "last_name": "Doe",
  "company_name": "Acme Inc",
  "variables": {
    "custom_field": "custom_value"
  }
}

Bulk Add Leads

POST /instantly/api/v2/leads
Content-Type: application/json

{
  "campaign_id": "019bb3bd-9963-789e-b776-6c6927ef3f79",
  "leads": [
    {
      "email": "[email protected]",
      "first_name": "John"
    },
    {
      "email": "[email protected]",
      "first_name": "Jane"
    }
  ]
}

List Leads

Note: This is a POST endpoint due to complex filtering requirements.

POST /instantly/api/v2/leads/list
Content-Type: application/json

{
  "campaign_id": "019bb3bd-9963-789e-b776-6c6927ef3f79",
  "limit": 100
}

Get Lead

GET /instantly/api/v2/leads/{lead_id}

Delete Lead

DELETE /instantly/api/v2/leads/{lead_id}

Move Leads

POST /instantly/api/v2/leads/move
Content-Type: application/json

{
  "lead_ids": ["lead_id_1", "lead_id_2"],
  "to_campaign_id": "target_campaign_id"
}

Lead Lists

List Lead Lists

GET /instantly/api/v2/lead-lists?limit=10

Create Lead List

POST /instantly/api/v2/lead-lists
Content-Type: application/json

{
  "name": "My Lead List"
}

Get Lead List

GET /instantly/api/v2/lead-lists/{list_id}

Update Lead List

PATCH /instantly/api/v2/lead-lists/{list_id}
Content-Type: application/json

{
  "name": "Updated List Name"
}

Delete Lead List

DELETE /instantly/api/v2/lead-lists/{list_id}

Accounts (Sending Email Accounts)

List Accounts

GET /instantly/api/v2/accounts?limit=10

Get Account

GET /instantly/api/v2/accounts/{email}

Create Account

POST /instantly/api/v2/accounts
Content-Type: application/json

{
  "email": "[email protected]",
  "first_name": "John",
  "last_name": "Doe",
  "provider_code": "google",
  "smtp_host": "smtp.gmail.com",
  "smtp_port": 587,
  "smtp_username": "[email protected]",
  "smtp_password": "app_password",
  "imap_host": "imap.gmail.com",
  "imap_port": 993,
  "imap_username": "[email protected]",
  "imap_password": "app_password"
}

Update Account

PATCH /instantly/api/v2/accounts/{email}
Content-Type: application/json

{
  "first_name": "Jane"
}

Delete Account

DELETE /instantly/api/v2/accounts/{email}

Enable Warmup

POST /instantly/api/v2/accounts/warmup/enable
Content-Type: application/json

{
  "emails": ["[email protected]", "[email protected]"]
}

Disable Warmup

POST /instantly/api/v2/accounts/warmup/disable
Content-Type: application/json

{
  "emails": ["[email protected]"]
}

Emails (Unibox)

List Emails

GET /instantly/api/v2/emails?limit=20

Get Email

GET /instantly/api/v2/emails/{email_id}

Reply to Email

POST /instantly/api/v2/emails/reply
Content-Type: application/json

{
  "reply_to_uuid": "email_uuid",
  "body": "Thank you for your response!"
}

Forward Email

POST /instantly/api/v2/emails/forward
Content-Type: application/json

{
  "email_uuid": "email_uuid",
  "to": "[email protected]"
}

Mark Thread as Read

POST /instantly/api/v2/emails/threads/{thread_id}/mark-as-read

Get Unread Count

GET /instantly/api/v2/emails/unread/count

Update Email

PATCH /instantly/api/v2/emails/{email_id}
Content-Type: application/json

{
  "is_read": true
}

Delete Email

DELETE /instantly/api/v2/emails/{email_id}

Analytics

Get Campaign Analytics

GET /instantly/api/v2/campaigns/analytics?id={campaign_id}

Query parameters:

• id - Campaign ID (leave empty for all campaigns)
• start_date - Filter start date (YYYY-MM-DD)
• end_date - Filter end date (YYYY-MM-DD)
• exclude_total_leads_count - Set to true for faster response

Get Campaign Analytics Overview

GET /instantly/api/v2/campaigns/analytics/overview?id={campaign_id}

Get Daily Campaign Analytics

GET /instantly/api/v2/campaigns/analytics/daily?id={campaign_id}

Get Campaign Step Analytics

GET /instantly/api/v2/campaigns/analytics/steps?id={campaign_id}

Get Warmup Analytics

POST /instantly/api/v2/accounts/warmup/analytics
Content-Type: application/json

{
  "emails": ["[email protected]"]
}

Block List

List Block List Entries

GET /instantly/api/v2/block-lists-entries?limit=100

Query parameters:

• domains_only - Filter to domain entries only
• search - Search entries

Create Block List Entry

POST /instantly/api/v2/block-lists-entries
Content-Type: application/json

{
  "bl_value": "[email protected]"
}

Or block a domain:

POST /instantly/api/v2/block-lists-entries
Content-Type: application/json

{
  "bl_value": "blockeddomain.com"
}

Delete Block List Entry

DELETE /instantly/api/v2/block-lists-entries/{entry_id}

Email Verification

Verify Email

GET /instantly/api/v2/email-verification/{email}

If verification takes longer than 10 seconds, status will be pending. Poll this endpoint to check status.

Response fields:

• verification_status - Use this field (not status) to determine verification result

Background Jobs

Get Background Job Status

GET /instantly/api/v2/background-jobs/{job_id}

Query parameters:

• data_fields - Comma-separated fields (e.g., success_count,failed_count,total_to_process)

Workspace

Get Current Workspace

GET /instantly/api/v2/workspaces/current

Custom Tags

Toggle Tag on Resource

POST /instantly/api/v2/custom-tags/toggle-resource
Content-Type: application/json

{
  "tag_id": "tag_uuid",
  "resource_id": "campaign_or_account_id",
  "resource_type": "campaign"
}

Pagination

Instantly uses cursor-based pagination with limit and starting_after:

GET /instantly/api/v2/campaigns?limit=10&starting_after=cursor_value

Response includes pagination info:

{
  "items": [...],
  "next_starting_after": "cursor_for_next_page"
}

Use next_starting_after value in the next request's starting_after parameter.

Code Examples

JavaScript

const response = await fetch(
  'https://gateway.maton.ai/instantly/api/v2/campaigns?limit=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/instantly/api/v2/campaigns',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'},
    params={'limit': 10}
)
data = response.json()

Notes

• Instantly API v2 uses snake_case for all field names
• Lead custom variables must be string, number, boolean, or null (no objects/arrays)
• The List Leads endpoint is POST (not GET) due to complex filtering requirements
• Campaign status values: 0=draft, 1=active, 2=paused, 3=completed
• Email verification may return pending status if it takes longer than 10 seconds
• Warmup operations return background job IDs - poll the background jobs endpoint for status
• IMPORTANT: When using curl commands, use curl -g when URLs contain brackets to disable glob parsing
• IMPORTANT: When piping curl output to jq, environment variables may not expand correctly. Use Python examples instead.

Error Handling

Troubleshooting: API Key Issues

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 \x3C\x3C'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

1. Ensure your URL path starts with instantly. For example:

• Correct: https://gateway.maton.ai/instantly/api/v2/campaigns
• Incorrect: https://gateway.maton.ai/api/v2/campaigns

Resources

• Instantly API V2 Documentation
• Instantly API Introduction
• Instantly Help Center
• Maton Community
• Maton Support