GrowFast

npx add-mcp 'https://growfast.sh/api/mcp'

GrowFast — 24/7 AI Sales Agent for founders

Domain-In. Matching B2B Companies Out.

An AI sales and outreach agent that runs around the clock. Enter your product domain, review the companies that match your customer profile, and send personalized cold email with follow-ups from a managed GrowFast address (no DNS, with a daily limit that ramps up over the first week) or your own verified domain. Results depend on your offer and your list.

Scan a domain without an account Lead addresses MX-checked

GrowFast at a glance

GrowFast is a B2B lead-finding and cold-outreach service built for AI agents to operate over MCP and REST: the agent scans a product's domain, finds matching companies with an MX-checked contact address, drafts the emails and, when told to, sends them with follow-ups; the human owner approves and audits.

Who it is for

• AI agents (ChatGPT, Claude, Claude Code, Cursor, Gemini CLI and other MCP clients) that find customers or run outreach for a person or a company
• B2B SaaS founders, small sales teams and agencies who assign that work to an agent and approve what it does
• Individuals and small businesses who want to ask an assistant who their customers could be

What it does not do

• Promise a number of leads, replies or meetings
• Guess email addresses: an address is used only if it was read from a public page, and it is MX-checked
• Send or post anything from the ChatGPT and Claude connectors (they only research and draft)
• Post to Reddit on its own, or use any Reddit account but the owner's
• Reach channels other than email (and Reddit drafts): no LinkedIn, SMS or calling

Price

Pay a $2.99 non-refundable start fee, get 3 days of access, then from $49/month unless you cancel. Sending needs a paid plan or a credit pack: plans from $49/month (250 outreach emails and 1,000 domain scans a month, billed monthly per account), or pay as you go from $29 for 750 emails, one-time, no subscription. Pricing.

Integrations

AISend (email delivery); Reddit (the owner's own account, each reply sent after a confirmed click); Sign-in with Google or email and password; MCP clients over OAuth 2.1 or an API key.

Security basics

• API keys are stored hashed and can be revoked in Settings > API keys
• OAuth sign-in shows a consent screen; the key it creates expires after 90 days by default
• Every email carries the sender's postal address and a one-click unsubscribe link; anyone who unsubscribed, complained or bounced is never written to again

How to start

Under five minutes: add the MCP server to your assistant (growfast.sh/mcp), approve the consent screen, then tell the agent to scan your domain. Or paste a domain at growfast.sh to scan it without an account.

MCP server

https://growfast.sh/api/mcp, Official MCP Registry name sh.growfast/growfast. Connect · Agent quickstart

Domain Scanner

Test Your Website URL & Get ICP + Sample Leads

Enter your product domain below. Our AI agent extracts your ICP, sketches the kind of decision-maker it should target, and drafts a personalized teardown email. The example contacts below are illustrative, not a verified contact list.

Why Founders Switch to GrowFast

Lead finding and sending in one plan

A typical cold email stack is a lead database plus a separate sending tool. GrowFast finds the companies and sends the emails from one account. You can start from a managed GrowFast address with no DNS (15 emails a day for the first 3 days, rising to 50 a day after a week), or connect your own domain with the DNS records we show you.

Feature / Setup	Hiring In-House SDR	Apollo + Instantly	GrowFast
Monthly cost	A full-time salary	Instantly Outreach from $47/mo, and its lead-credit plans are separate (from $9/mo; instantly.ai/pricing, read 2026-10-30). Apollo's plans are on apollo.io/pricing.	$49/mo (Starter), or $29 once for 750 emails
Emails per month at that price	Whatever the rep sends	Instantly Growth: 5,000	250, plus 1,000 domain scans
Before the first email	Hiring and onboarding	Build a list, connect the sending tool	Scan your domain, review leads, send from the managed address
Sending domain setup	Your IT setup	DNS records per tool	Managed address, or guided setup for your own domain
AI ICP & Lead Sourcing	Manual LinkedIn searches	Manual list filtering	Autonomous AI Recon

What one scan gives you

A domain goes in. An ideal customer profile, contactable companies that match it, and a first email come back.

Start from a domain

Paste a URL. The agent reads the site and works out what is sold and to whom — no forms, no onboarding call.

An ICP you can argue with

Job title, industry, company size, and the pain points the product claims to solve — written out so you can correct it rather than guess what the model assumed.

Companies that exist

Leads come from a public index of company websites, YouTube channels that publish a business email, and Reddit posters who asked for what you sell. Each one carries the page its address was read from, and is scored 1-10 for fit before you see it.

Addresses that can receive mail

Each address gets an MX check before it reaches you. Role mailboxes nobody reads — noreply, abuse, dpo, legal — are dropped rather than handed over.

A first email, already written

A cold email drafted against that specific ICP, with the subject line, ready to edit rather than start from an empty box.

Scan before you sign up

Check your own domain on this page without an account, three a day per visitor. A trial then covers your account's scans, drafts and, from the first plan charge, sending.

Free cold email deliverability tools

Live SPF, DKIM, DMARC and MX checks for any domain, and a cold email checker that runs in your browser. No account; the same checks we run on our own sending domains.

SPF record checker

Reads the live SPF record, resolves every include it points at, and counts the DNS lookups. Over ten, receivers stop evaluating your SPF entirely.

DMARC record checker

Reads the record at _dmarc on your domain and explains the policy it publishes — including the cases where a record exists but does nothing.

MX lookup

Resolves the MX records and names the provider behind them — which decides whether an address on this domain can be checked before you send to it.

DKIM record checker

Finds the DKIM key at <selector>._domainkey on your domain and reads its length and flags. Enter your selector if you know it; otherwise it tries the selectors the common providers use.

Cold email checker

Paste the subject and the body. Each finding says whether it comes from a published rule, with the source and the date we read it, or is only our judgement. Nothing is sent anywhere, and there is no score.

Cold email deliverability audit

Every DNS check on this site at once, for a domain you are about to send from. It takes about a second and touches nothing but DNS.

All free tools ·Public GTM teardowns: resend.com teardown, invideo.io teardown · All teardowns

Simple, transparent pricing

Choose the plan that fits your growth goals. Lead finding is included in every plan — compare that with Instantly, which sells leads and sending separately.

Pay a $2.99 non-refundable start fee, get 3 days of access, then from $49/month unless you cancel. Cancel any time in Settings > Billing > Cancel: one button, no call or email needed.

Use GrowFast from your AI assistant

GrowFast is built for AI agents to operate: a remote MCP server for ChatGPT, Claude, Cursor, Gemini CLI and VS Code lets your agent scan a product site, score matching companies and draft first emails, while you approve and review. See the tools and install steps, the agent quickstart and how to find B2B leads from a domain.

Frequently asked questions

Find your first prospects this week

Scan your domain, review the companies that match, and send the first emails.

Pay a $2.99 non-refundable start fee, get 3 days of access, then from $49/month unless you cancel.

Start 3-day trial for $2.99