Trusted by 87,000+ Businesses

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Automate Cold Outreach With Cold Email API & Webhooks

Run high-volume campaigns with full control over logic, timing, and replies.

Use Smartlead’s API to programmatically send campaigns and follow-ups.

Set conditions for replies, pauses, or lead updates without manual input.

Automate complex workflows across multiple inboxes and campaigns.

Let webhooks sync real-time updates across your CRM or reporting tools.

Everything You Need to Run Cold Email at Scale - Automatically

APIs that help you automate what matters most.

Trigger cold emails and follow-ups directly from your own backend.

Assign leads, switch sequences, and update campaign status.

Access inboxes, replies, and lead actions to control your workflow.

Balance volume with our email deliverability API layer.

Higher Engagement, Better Results

Smartlead helped us scale to millions of emails with strong deliverability. The unlimited sending, easy inbox warm-up, and flexibility with custom tracking domains make it perfect for high-volume outbound. The UI is clean and the team ships updates fast. Workflows are intuitive, support is responsive, and Smartlead keeps improving with features that actually matter—like inbox rotation, blacklist monitoring, and advanced reply detection.

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Gabriel M.

Founder, CEO - Reachflow

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Real-Time Webhooks for Smarter Workflows

Stay in Sync With Real-Time Webhooks.

Get notified the moment a lead replies, bounces, or unsubscribes.

Push updates to Slack, CRMs, Google Sheets, or internal dashboards.

Connect your tools and workflows so nothing falls through the cracks.

Replace manual status checks with automated, real-time updates.

Communicate With Any CRM or App in the World

Sync leads in real-time via webhooks and the cold email API.

Plug straight into HubSpot, Salesforce, Pipedrive, Zoho, and more.

Use Zapier, Make, or N8N to push or pull data between Smartlead and 6,000+ apps.

Trigger workflows the instant a prospect replies, bounces, or books a call.

Keep every team and client dashboard aligned with one always-up-to-date data stream.

What Our Customers Say

I can upload hundreds of email accounts, send thousands of cold emails per day, and still have an organized master inbox. This is unseen with any other tool on the market today. I looked...

Mykyta

CEO, Yell Cut

4.5
I've personally built a sales engagement platform similar to Smartlead, and I am genuinely blown away by the scalability, functionality and more. We're a B2B Lead Gen Agency, and we primarily use cold email to generate leads for our clients. We're on track to double our best month in terms of client results.

Nick A.

Founder, Leadbird.io

4.5
Smartlead is an innovative cold email platform that helps me reach out to potential clients. There are easy-to-use templates, powerful automation tools, and intuitive analytics for email warming and campaign analytics. It provides me with everything I need to maximize my cold email campaigns.

Reggie B.

Sales Director - Financial Institution Solutions Saggezza, Inc.

4.5
Smartlead is an absolute game-changer! With its exceptional features and support from the Smartlead team, I've experienced remarkable success. The customizable platform and cost-effective pricing have revolutionized our cold emailing game. I would rate it 10 out of 10 for satisfaction. A must-have tool for any B2B agency!

Romain Osman

Co-Founder, Five Element

4.5
Innovative, reliable, and Suitable For Technical and Non-Technical Users. SmartLead's ability to help me land in the primary inbox and automate the laborious parts of my workflow is brilliant. The customer support is incredibly good, I've had some great feedback on my cold email campaigns.

Ryane Tully

Co-founder, Pitchlane

4.5
Hands down the best cold email software. Smartlead is amazing, this is the best tool if you want to cold email at scale and land in the inbox. The team is super responsive with great support. While there is a learning curve to cold email, they really built a great foundation to make it as simple as possible. I am sending over 2k emails a day!!! absolute game changer for my business.

Eden Einav

Account Executive, B.I.G. Charity Law Group Professional Corporation

4.5
Intuitive. Game-Changing. POWERFUL. Analytics, spintax, A/B testing, quick personalization. This is a game changer if you send cold email campaign. Grateful to this team for building a product that has changed our day to day. 🚀

David Borman

Senior Account Executive, Key Outreach

4.5
The best outbound email marketing software. Customer support - they are so responsive and helpful Features - you can add multiple email domains to the same account.

Bojan Najdov

Founder, Lambda Group

4.5
Smartlead has been extremely helpful with seamlessly onboarding clients, warming up their accounts, and prepping campaigns to send at high volumes while maintaining high deliverability. There are multiple features that allow me to track performance over time and understand when it is time for me to make adjustments, and Vaibhav is constantly making improvements/upgrades to the platform which gives me all the more faith in the future of this great tool.

Dino Knezovic

Founder, Office Optim

4.5
Smartlead is absolutely amazing! The software is easy to understand I am not a techie but directly understand everything and if you really have a question the team always helps instantly. Additionally I love all the features. Like I said for me as a lead generation agency the software gives me everything I need and much more.

Johannes Fessler

CEO, Rock Solid Lead Generation

4.5
Terrific platform for agencies. The platform is intuitive and makes it easy to manage multiple client accounts. I love the email warmup feature, the sub-accounts, and the branded client portal. Deliverability and analytics are solid. Great customer support.

Kris Sharma

Founder, Webinar Dude

4.5
Total game changer for cold outreach. Packed with features: Spintax, Rotating Inboxes, AI Email Categorization, Subsequences, Tagging, and Whitelabeling. Their team is SUPER responsive and implements changes quickly, and it is the most reliable cold email tool I've ever used.

Matthew Lucero

Founder, Anevo Marketing

4.5
Best Cold Email Marketing Tool for individuals as well as agencies. Smartlead has simplified email marketing to another infinity. With their domain rotation, email warmups and unified inbox, this is an absolute gamechanger in the industry right now. With such an affordable pricepoint, they really offer you the best bang for the buck and superseeds any email automation tool in the market like salesloft/outreach or reply. Vaibhav is more than just an amazing guy, who is super helpful and approachable. This tool would guarenteed be the next best thing in the market and the best part is they never stop innovating. Complete no brainer to opt for this against any other tool that you are using for email outreach at the current moment. Trust me you wouldn't be disappointed. Review collected by and hosted on G2.com.

Abhishek Basu

Account Executive, Leadzilla

4.5
Best cold email tool in the game. Most user friendly cold email tool I've used to date. Super easy to set up, love the bulk upload feature to add multiple domains at once and support is impeccable. They respond so fast it's unreal. Review collected by and hosted on G2.com.

Serdar Tufan

Owner, FunnelVision

4.5
I just ended my 2 year search for the right cold emailing platform with Smartlead. A stand alone tool for cold emailing unlike anything else in the market. And it looks like they're only getting started. Now I can finally train my VAs on just one platform instead of bouncing between several like they used to for different things.

Cliff Coelho

Owner, Storydriven.video

4.5
Best cold outbound email software out there. Everything, is fast, reliable, scalable, you can also white-label, amazing analytics and never breaks like other similar competitors. Never once I went in spam in the last 4 months of using it.

Arnold Koci

CEO, Acquisizioneclienti.it

4.5
Smartlead is an absolute game-changer! With its exceptional features and support from the Smartlead team, I've experienced remarkable success. The customizable platform and cost-effective pricing have revolutionized our cold emailing game. I would rate it 10 out of 10 for satisfaction. A must-have tool for any B2B agency!

Romain Osman

Co-Founder, Five Element

4.5
Our campaigns weren't just about reaching out, but reaching out right, and Smartlead helped us achieve this. It has added immense value to our business by prioritizing email deliverability and customer needs. I would rate it a 9 out of 10

Lucas Maliczak

Outbound Lead & Partner, Peakora

4.5
Smartlead is simply amazing. They constantly improve their product and bring new features that make the cold email software even more complete. If you're a big automation enthusiast like me, there are no other cold email tools on the market that allow you to 100% automate your business as Smartlead does.

René-Karl Lambert

Founder, WindGrowth

4.5
Intuitive. Game-Changing. POWERFUL. Analytics, spintax, A/B testing, quick personalization. This is a game changer if you send cold email campaign. Grateful to this team for building a product that has changed our day to day. 🚀

David Borman

Senior Account Executive, Key Outreach

4.5
The best outbound email marketing software. Customer support - they are so responsive and helpful Features - you can add multiple email domains to the same account.

Bojan Najdov

Founder, Lambda Group

4.5
Smartlead has been extremely helpful with seamlessly onboarding clients, warming up their accounts, and prepping campaigns to send at high volumes while maintaining high deliverability. There are multiple features that allow me to track performance over time and understand when it is time for me to make adjustments, and Vaibhav is constantly making improvements/upgrades to the platform which gives me all the more faith in the future of this great tool.

Dino Knezovic

Founder, Office Optim

4.5
Smartlead is absolutely amazing! The software is easy to understand I am not a techie but directly understand everything and if you really have a question the team always helps instantly. Additionally I love all the features. Like I said for me as a lead generation agency the software gives me everything I need and much more.

Johannes Fessler

CEO, Rock Solid Lead Generation

4.5
Terrific platform for agencies. The platform is intuitive and makes it easy to manage multiple client accounts. I love the email warmup feature, the sub-accounts, and the branded client portal. Deliverability and analytics are solid. Great customer support.

Kris Sharma

Founder, Webinar Dude

4.5
Total game changer for cold outreach. Packed with features: Spintax, Rotating Inboxes, AI Email Categorization, Subsequences, Tagging, and Whitelabeling. Their team is SUPER responsive and implements changes quickly, and it is the most reliable cold email tool I've ever used.

Matthew Lucero

Founder, Anevo Marketing

4.5
Best Cold Email Marketing Tool for individuals as well as agencies. Smartlead has simplified email marketing to another infinity. With their domain rotation, email warmups and unified inbox, this is an absolute gamechanger in the industry right now. With such an affordable pricepoint, they really offer you the best bang for the buck and superseeds any email automation tool in the market like salesloft/outreach or reply. Vaibhav is more than just an amazing guy, who is super helpful and approachable. This tool would guarenteed be the next best thing in the market and the best part is they never stop innovating. Complete no brainer to opt for this against any other tool that you are using for email outreach at the current moment. Trust me you wouldn't be disappointed. Review collected by and hosted on G2.com.

Abhishek Basu

Account Executive, Leadzilla

4.5
Best cold email tool in the game. Most user friendly cold email tool I've used to date. Super easy to set up, love the bulk upload feature to add multiple domains at once and support is impeccable. They respond so fast it's unreal. Review collected by and hosted on G2.com.

Serdar Tufan

Owner, FunnelVision

4.5
I just ended my 2 year search for the right cold emailing platform with Smartlead. A stand alone tool for cold emailing unlike anything else in the market. And it looks like they're only getting started. Now I can finally train my VAs on just one platform instead of bouncing between several like they used to for different things.

Cliff Coelho

Owner, Storydriven.video

4.5
Best cold outbound email software out there. Everything, is fast, reliable, scalable, you can also white-label, amazing analytics and never breaks like other similar competitors. Never once I went in spam in the last 4 months of using it.

Arnold Koci

CEO, Acquisizioneclienti.it

4.5
Smartlead is an absolute game-changer! With its exceptional features and support from the Smartlead team, I've experienced remarkable success. The customizable platform and cost-effective pricing have revolutionized our cold emailing game. I would rate it 10 out of 10 for satisfaction. A must-have tool for any B2B agency!

Romain Osman

Co-Founder, Five Element

4.5
Our campaigns weren't just about reaching out, but reaching out right, and Smartlead helped us achieve this. It has added immense value to our business by prioritizing email deliverability and customer needs. I would rate it a 9 out of 10

Lucas Maliczak

Outbound Lead & Partner, Peakora

4.5
Smartlead is simply amazing. They constantly improve their product and bring new features that make the cold email software even more complete. If you're a big automation enthusiast like me, there are no other cold email tools on the market that allow you to 100% automate your business as Smartlead does.

René-Karl Lambert

Founder, WindGrowth

4.5
Total game changer for cold outreach. Packed with features: Spintax, Rotating Inboxes, AI Email Categorization, Subsequences, Tagging, and Whitelabeling. Their team is SUPER responsive and implements changes quickly, and it is the most reliable cold email tool I've ever used.

Matthew Lucero

Founder, Anevo Marketing

4.5
Best Cold Email Marketing Tool for individuals as well as agencies. Smartlead has simplified email marketing to another infinity. With their domain rotation, email warmups and unified inbox, this is an absolute gamechanger in the industry right now. With such an affordable pricepoint, they really offer you the best bang for the buck and superseeds any email automation tool in the market like salesloft/outreach or reply. Vaibhav is more than just an amazing guy, who is super helpful and approachable. This tool would guarenteed be the next best thing in the market and the best part is they never stop innovating. Complete no brainer to opt for this against any other tool that you are using for email outreach at the current moment. Trust me you wouldn't be disappointed. Review collected by and hosted on G2.com.

Abhishek Basu

Account Executive, Leadzilla

4.5
Best cold email tool in the game. Most user friendly cold email tool I've used to date. Super easy to set up, love the bulk upload feature to add multiple domains at once and support is impeccable. They respond so fast it's unreal. Review collected by and hosted on G2.com.

Serdar Tufan

Owner, FunnelVision

4.5
I just ended my 2 year search for the right cold emailing platform with Smartlead. A stand alone tool for cold emailing unlike anything else in the market. And it looks like they're only getting started. Now I can finally train my VAs on just one platform instead of bouncing between several like they used to for different things.

Cliff Coelho

Owner, Storydriven.video

4.5
Best cold outbound email software out there. Everything, is fast, reliable, scalable, you can also white-label, amazing analytics and never breaks like other similar competitors. Never once I went in spam in the last 4 months of using it.

Arnold Koci

CEO, Acquisizioneclienti.it

4.5
Smartlead is an absolute game-changer! With its exceptional features and support from the Smartlead team, I've experienced remarkable success. The customizable platform and cost-effective pricing have revolutionized our cold emailing game. I would rate it 10 out of 10 for satisfaction. A must-have tool for any B2B agency!

Romain Osman

Co-Founder, Five Element

4.5
Our campaigns weren't just about reaching out, but reaching out right, and Smartlead helped us achieve this. It has added immense value to our business by prioritizing email deliverability and customer needs. I would rate it a 9 out of 10

Lucas Maliczak

Outbound Lead & Partner, Peakora

4.5
Smartlead is simply amazing. They constantly improve their product and bring new features that make the cold email software even more complete. If you're a big automation enthusiast like me, there are no other cold email tools on the market that allow you to 100% automate your business as Smartlead does.

René-Karl Lambert

Founder, WindGrowth

4.5

Frequently Asked Questions

Still Have Questions ?

Sign up for free

What is Smartlead’s API used for in cold email automation?

Smartlead’s API lets you control campaign sends, manage inboxes, update lead statuses, and automate follow-ups—all from your internal systems.

How do webhooks work in Smartlead?

Smartlead webhooks notify you in real time when key events happen—like a lead replying, bouncing, or unsubscribing—so you can trigger custom actions instantly.

Can agencies use Smartlead API to manage multiple client accounts?

Yes. Agencies can use the API to manage campaigns, leads, and inboxes across unlimited accounts from one centralized system.

What kind of workflows can be automated using Smartlead API and webhooks?

You can automate cold email sends, lead routing, follow-up triggers, CRM syncing, reporting, and status updates—ideal for large-scale outreach.

Is there documentation available for Smartlead’s API and webhooks?

Yes. You can access full Smartlead API documentation and webhook setup guides from the API Docs page.

Let’s Build Your Custom Outreach Engine

Set a tailored outbound motion with features built for enterprises.

Book for a Demo

Powerful API’s and Automation

More Demos. More Sales. Less Work.

Automate your entire outbound infrastructure using the most powerful cold email API and automation infrastructure in the market.

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Trusted by 87,000+ Businesses

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Over 87,000+ Businesses

Sending through Smartlead to flood their pipeline with leads.

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Over 87,000+ Businesses

Sending through Smartlead to flood their pipeline with leads.

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Automate Your Entire Campaign’s Flow Without Lifting a Finger

Create campaigns, adjust your settings, and push/pull data between software using our powerful API and webhook infrastructure.

  • Automate campaign creation and management.
  • Add 1000s of mailboxes in a matter of seconds.
  • Drip feed leads to live campaigns using the API.
  • Manage leads, automation, & meeting bookings via the API.
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Consistently Land In Your Lead’s Inbox With AI Warmups

Build and defend your mailbox sending reputation with 110k diverse mailboxes across Outlook, Google, Zoho and more.

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Leads are auto-categorized based on their contextual reply sentiment.

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Select from multiple categories to match your leads intent.

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Automate positive, negative, out of the office and other scenarios with sub-sequences.

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Lucas Maliczak

Smartlead has added immense value to our business by prioritizing email deliverability and customer needs. I would rate it a 9 out of 10.

Lucas Maliczak
Outbound Lead & Partner at Peakora


Automate Scenarios Using Your Leads' Behaviour

Create sub-sequences based on your leads' intentions. Close deals without any manual work.

  • Listen and react to your lead's replies automatically.
  • Build sequences to auto-handle any lead response.
  • Auto-handle & convert "Out of Office", "Not Interested", “Interested” responses.
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Communicate With Any CRM or App In the World

Smartlead’s webhook and API infrastructure lets you easily communicate with any product in the market.

  • Use Zapier, Make, N8N to push or pull data between Smartlead and your favorite app.
  • Use Hubspot, Salesforce, Pipedrive & many more native integrations to manage your leads.
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Customer Success Stories

Discover real-world examples of how Smartlead helped businesses like yours.

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Smartlead has been extremely helpful with seamlessly onboarding clients, warming up their accounts, and prepping campaigns to send at high volumes while maintaining high deliverability. There are multiple features that allow me to track performance over time and understand when it is time for me to make adjustments, and Vaibhav is constantly making improvements/upgrades to the platform which gives me all the more faith in the future of this great tool.

Dino Knezovic

Founder, Office Optim

5

The best outbound email marketing software. Customer support - they are so responsive and helpful Features - you can add multiple email domains to the same account.

Bojan Najdov

Founder, Lambda Group

5

Intuitive. Game-Changing. POWERFUL. Analytics, spintax, A/B testing, quick personalization. This is a game changer if you send cold email campaign. Grateful to this team for building a product that has changed our day to day. 🚀

David Borman

Senior Account Executive, Key Outreach

5

Hands down the best cold email software. Smartlead is amazing, this is the best tool if you want to cold email at scale and land in the inbox. The team is super responsive with great support. While there is a learning curve to cold email, they really built a great foundation to make it as simple as possible. I am sending over 2k emails a day!!! absolute game changer for my business.

Eden Einav

Account Executive, B.I.G. Charity Law Group Professional Corporation

5

Innovative, reliable, and Suitable For Technical and Non-Technical Users. SmartLead's ability to help me land in the primary inbox and automate the laborious parts of my workflow is brilliant. The customer support is incredibly good, I've had some great feedback on my cold email campaigns.

Ryane Tully

Co-founder, Pitchlane

5

Smartlead is an absolute game-changer! With its exceptional features and support from the Smartlead team, I've experienced remarkable success. The customizable platform and cost-effective pricing have revolutionized our cold emailing game. I would rate it 10 out of 10 for satisfaction. A must-have tool for any B2B agency!

Romain Osman

Co-Founder, Five Element

5

Smartlead is an innovative cold email platform that helps me reach out to potential clients. There are easy-to-use templates, powerful automation tools, and intuitive analytics for email warming and campaign analytics. It provides me with everything I need to maximize my cold email campaigns.

Reggie B.

Sales Director - Financial Institution Solutions Saggezza, Inc.

5

I've personally built a sales engagement platform similar to Smartlead, and I am genuinely blown away by the scalability, functionality and more. We're a B2B Lead Gen Agency, and we primarily use cold email to generate leads for our clients. We're on track to double our best month in terms of client results.

Nick A.

Founder, Leadbird.io

5

I can upload hundreds of email accounts, send thousands of cold emails per day, and still have an organized master inbox. This is unseen with any other tool on the market today. I looked...

Mykyta

CEO, Yell Cut

5

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Seamless Integration with Your Favorite Apps

Connect all your tools and streamline your workflow with ease. Our product integrates seamlessly with the apps you already love and use every day.

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Powerful Automated Email Marketing that Drives Sales.

  • All Features Included
  • No Credit Card Required
  • Free Warmup Included
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