Smartlead API, MCP server and integrations with HubSpot, Clay and Zapier
Smartlead’s API opens on Pro and every plan above it, never on Base, and its reference lives on a developer site of its own, apart from the help center: api.smartlead.ai.
REST API and its documentation
Endpoints for campaigns, sequences, leads, mailboxes, warm-up, the master inbox, webhooks and analytics. Leads are imported up to 400 per request, and the key travels as a parameter in the URL: there is no OAuth.
From ProRate limits: two answers
The rate-limit guide of those docs lists 60 requests a minute for a "Standard" tier and 120 for "Pro", without saying which plan falls in which tier (no plan is called Standard). Its introduction and the help center say the limit depends on your plan and send you to support. Up to 25 admin keys can be created, all counted against that one limit. Emelia sets its own per plan: 100, 300 or 1,000 requests a minute.
MCP server for AI assistants
"116+ tools" in 6 categories let Claude Desktop or another assistant read and run campaigns, mailboxes and lead lists. The server runs on your computer through Node.js and starts with your API key. Smartlead’s setup guide calls it free with any paid plan, yet that key only exists from Pro.
From ProCRMs
HubSpot, Salesforce, Pipedrive, Zoho CRM, Attio, GoHighLevel and Insightly. HubSpot is a native integration and Salesforce syncs both ways. The pricing page lists "CRM access" from Pro.
Lead data
Clay, Listkit, LeadMagic and Anymail Finder, to fill campaigns with leads found elsewhere.
Automation
Zapier, Make and n8n, plus webhooks for replies, bounces and unsubscribes from Pro.
Calls
CloudTalk and Dialpad as integrations, or SmartDialer, Smartlead’s own dialer, sold as an add-on on the pricing page, "included" according to Smartlead’s comparison with lemlist: from $9/month in credits, with US numbers from $1 a month.
Add-onWhat is Smartlead.ai? A sending platform built for agencies and high volume
Smartlead.ai is a cold email platform billed by sending volume. You connect as many Gmail, Outlook or SMTP mailboxes as you like, Smartlead warms them up and rotates them inside your campaigns, and your plan decides how many emails leave each month: 6,000 on Base, up to 5,100,000 on the largest tier of its price slider.
It is published by 521 Products Pty Ltd, an Australian company based in Sydney, and names Vaibhav Namburi as its founder. Smartlead claims "100,000+ businesses" as customers and cites Lovable, Replit, Brex, Clay and Superhuman among them. Smartlead, Smartlead AI and Smartlead.ai are the same product, sold on smartlead.ai.
Its pricing page and add-ons are written for agencies and high-volume senders: client workspaces under white label, dedicated sending servers, mailboxes and domains sold inside the app, inbox placement tests.
Smartlead in figures
- Publisher
- 521 Products Pty Ltd, Sydney (Australia)
- Founder
- Vaibhav Namburi
- Customers claimed
- 100,000+
- Billing
- By emails sent per month, in US dollars only, excluding tax
- Plans
- $39 to $379 a month, then volume tiers and Enterprise
- Mailboxes
- Unlimited on every plan
- Not native: through HeyReach, Aimfox and other tools
- Free trial
- 14 days, no card, 2,500 emails
- Trustpilot
- 2.9/5 from 140 reviews
Deliverability: warm-up pools by plan, sender rotation and placement tests
Warm-up is included on every plan, but the network your mailboxes warm up with depends on the plan you pay for.
Warm-up pools that follow the plan
Base warms up in the "Foundation" pool, Pro in "Growth", Unlimited Smart in "Premium". An "Ultra Premium" pool is described as a paid add-on, currently free for mailboxes that meet its criteria: age, SPF, DKIM and DMARC, bounce and reply rates.
Every planAutomatic sender rotation
A campaign spreads its emails across every mailbox you attach to it. An automatic setting keeps about 10 warm-up emails a day per mailbox running next to real sends.
Every planThe sending pace Smartlead recommends
For the mailboxes it sells, Smartlead’s help center suggests 15 to 25 emails a day, at least 15 minutes apart. Its mailbox store says most senders stay between 20 and 50 a day, with 2 to 3 mailboxes per domain.
Inbox placement tests (SmartDelivery)
Sold separately: $49/month for 120 tests on 50 seed accounts, $174 and $599 for unlimited tests on 200 and 500 accounts.
Add-onDedicated servers (SmartServers)
Sending servers with a dedicated IP, in the United States or the European Union, at $39 per server per month. Unlimited Prime includes 3.
Add-on, from ProMaster Inbox, spintax and SmartAssistant: the day-to-day features
Master Inbox
Replies from every mailbox land in one inbox, sorted into categories by AI, with assignment to a teammate, internal notes and a client view for agencies. Replies can be pushed to a CRM or to Slack.
Spintax, A/B tests and sub-sequences
Spintax varies the wording of each email so that no two are identical, A/B tests compare versions of a step, and campaigns can include sub-sequences.
SmartAssistant and SmartAgents
SmartAssistant, an AI assistant included in every plan and in the trial, builds campaigns and diagnoses problems in the account. SmartAgents run tasks described in plain language and connect to Slack, Google Sheets, Airtable, HeyReach and Aimfox.
A mobile app
Smartlead also has iOS and Android apps, listed on its pricing page.
Unlimited mailboxes, capped sends: how Smartlead counts your usage
Smartlead charges neither per user nor per mailbox. No plan limits how many mailboxes you connect, even if its fair use policy still quotes 100, 300 and 800 mailboxes for plan names Smartlead no longer uses. Each plan comes with three separate allowances, and the first one you use up is the one that limits you:
- Emails sent. Every email that goes out counts, follow-ups included. The counter resets each month on your billing date; when it reaches zero, nothing is sent until the renewal or an upgrade.
- Contacts stored. Each unique address in the account takes one lead credit, even when it sits in several campaigns. This counter never resets: you free space by deleting leads. 2,000 on Base, 30,000 on Pro, unlimited above.
- Verified emails. A monthly allowance of contacts from SmartProspect, Smartlead's lead database: one verified email for every 3 emails your plan can send. Included from Unlimited Smart, a paid option below according to the pricing page.
- Warm-up emails do not count toward the sending allowance, and a mailbox’s daily limit is shared between all the campaigns that use it.
- Two caveats from Smartlead’s own pages. The home page promises to "store unlimited leads", yet the pricing page, the pricing file and the help center all show these contact caps. And the home page, like Smartlead’s comparison with lemlist, counts verified emails as included from the entry plan, while the pricing page charges for them on Base and Pro.
Smartlead and LinkedIn: only through HeyReach, Aimfox and other tools
Smartlead has no LinkedIn automation of its own. Its integrations page says LinkedIn runs through SmartAgents with HeyReach and Aimfox, and lists Expandi, GetSales.io and Waalaxy as integrations. Each of these is a separate product, with its own subscription.
Keep that in mind when Smartlead describes itself as "email, LinkedIn, and calls unified in one platform": the LinkedIn steps are carried out by another tool, and calls go through SmartDialer, which the pricing page bills as an extra even though Smartlead’s lemlist comparison counts it as included.
Smartlead’s help center has an integration guide for HeyReach (and one for Aimfox); our HeyReach page explains how HeyReach bills.
Emelia takes the other route: LinkedIn accounts are part of every plan (1 on Start, 3 on Grow, 10 on Scale, then €29 per extra account per month), and LinkedIn and email steps sit in the same sequence.
Built for agencies: client workspaces, white label and dedicated servers
This is where Smartlead goes furthest. From Pro, each client gets its own workspace at $29 a month; Unlimited Prime includes 3. White label runs on the agency’s own subdomain and is switched on by Smartlead’s support. Each client can see the whole workspace or the replies only, with its own sending and lead quotas.
Team members are unlimited from Pro. Agencies can also buy mailboxes and domains inside the app (SmartSenders, from $3.99 per mailbox per month and $13 per domain per year) and rent dedicated servers.
One inconsistency to check in the app: Smartlead’s FAQ and its own comparison with lemlist mention one free client on Pro, while the pricing page charges $29 for every client workspace on Pro.
Emelia’s pricing page lists no client workspaces, white label or dedicated servers. For an agency that resells cold email under its own brand, this is a real advantage for Smartlead.
How much is Smartlead per month? Four plans, then volume tiers
US dollars, excluding tax, billed monthly; paying a year upfront takes about 17% off. Add-ons, the 33 volume tiers and a cost simulator are on the Smartlead pricing page.
Base
$39/month
$32.50/month billed yearly
- 6,000 emails a month
- 2,000 contacts stored
- No API, no CRM access
Pro
$94/month
$78.30/month billed yearly
- 90,000 emails a month
- 30,000 contacts stored
- API, webhooks, CRM, unlimited team members
Unlimited Smart
$174/month
$144.50/month billed yearly
- 150,000 emails a month
- Unlimited contacts
- 50,000 verified emails a month included
Unlimited Prime
$379/month
$314.60/month billed yearly
- 500,000 emails a month (510,000 on the price slider)
- 170,000 verified emails a month
- 3 client workspaces and 3 servers included
Above Unlimited Prime, the price slider goes up to 5,100,000 emails a month for $2,943, then Enterprise on quote. Whatever the plan, mailboxes are unlimited and warm-up comes with them. Smartlead marks Unlimited Smart as its most popular plan.
Smartlead or Emelia: which is cheaper at 3, 50, 300 and 1,000 mailboxes?
Cold email only, at the same number of mailboxes. We count 30 to 50 emails per mailbox per day over 30 days, hence the volume range of each row: the Smartlead plan follows that volume, the Emelia plan follows the number of mailboxes. Both columns are in dollars: Smartlead offers no other currency, and Emelia’s dollar price is the same number as its euro price, so each row’s winner is marked for dollar payers, with nothing converted.
Billed monthly
3 mailboxes (≈ 2,700 to 4,500 emails a month)
50 mailboxes (≈ 45,000 to 75,000 emails a month)
300 mailboxes (≈ 270,000 to 450,000 emails a month)
1,000 mailboxes (≈ 900,000 to 1,500,000 emails a month)
Yearly billing, monthly equivalent
3 mailboxes
50 mailboxes
300 mailboxes
1,000 mailboxes
Beyond the price
Contacts stored
API and webhooks
LinkedIn automation
Client workspaces (white label)
Free trial
Smartlead is cheaper for cold email alone from 4 to about 220 mailboxes: its Pro plan covers 90,000 emails for $94, then the Unlimited Smart tiers take over. Up to about 370 mailboxes, it depends on how much each mailbox sends; Emelia is cheaper up to 3 mailboxes and again from about 370. At the 15 to 25 emails a day Smartlead recommends, or the 14 a day its own benchmarks give as the median, each tier covers more mailboxes and Smartlead stays cheaper for longer. Before tax; Smartlead’s prices as of October 6, 2026.
Smartlead’s claims, checked against its own pages
A few statements on smartlead.ai do not match what other Smartlead pages say. None of them rules Smartlead out, but they are worth knowing before you rely on them. The pricing contradictions are on the pricing page.
- "Email, LinkedIn, and calls unified in one platform." LinkedIn depends on HeyReach or Aimfox. SmartDialer, the calling side, is priced as an add-on on one Smartlead page and described as "included" on another, its comparison with lemlist.
- SMS. The FAQ promises "email, social media, SMS"; we found no native SMS, only a Dialpad integration.
- Ratings. Smartlead says "4.6 stars on G2", and the structured data of its home page shows 4.8 from 100,000 reviews, which is the number of customers it claims. Trustpilot shows 2.9 from 140 reviews (details).
- Customers. "100,000+ businesses" across the site, 31,000 in the older FAQ.
- Support. A reply "within 24 hours" in the FAQ, live support around the clock on the warm-up page, business hours on business days in the terms of service.
Smartlead login, API, owner and other questions
The Smartlead web app is at app.smartlead.ai: the login page is app.smartlead.ai/login. Clients of an agency that uses white label log in on the agency’s own subdomain instead.
Yes, once an agency has white label switched on: its clients log in on the agency’s subdomain, with access to the whole workspace or to replies only. White label requires Pro, and each client workspace costs $29 a month.
Pro, Unlimited Smart and Unlimited Prime. The entry plan, Base, gets no API key and no webhooks, whereas Emelia opens both on Start, its first plan.
521 Products Pty Ltd (ACN 645 593 835), a private company based in New South Wales, Australia, with an Australian Business Number active since November 2, 2020. Smartlead names Vaibhav Namburi as its founder. It publishes neither its launch year, nor its headcount, nor any funding.
Yes. Smartlead, Smartlead AI and Smartlead.ai all refer to the same cold email platform, sold on smartlead.ai. Its AI assistant, SmartAssistant, is included in every plan.
The plans were renamed between December 2025 and February 2026 (Base, Pro, Unlimited Smart and a new Unlimited Prime). Pro now includes 90,000 emails a month, against 150,000 in November 2025, at the same price. An "API & Webhooks" row (Base excluded) and the SmartDialer add-on appeared on the pricing page between June 2026 and July 2026, and the site now offers 50% off the first month.
Emelia is a Smartlead competitor. We have tried to stay fair: every figure about Smartlead comes from its own website or public review sites.
