You can run a complete B2B sales funnel — research, outreach, nurture, CRM — for under $200 a month. Apollo.io handles prospect data at $49. Smartlead sends at volume for $39. HubSpot CRM is free. Claude or GPT-4o API runs $20-30 for personalization at scale. Email infrastructure fills the rest. That's your full agentic AI B2B marketing stack under 200 dollars. No SDR. No six-month ramp. No $140K liability sitting in a chair.
I need to tell you about a conference conversation first.
The Napkin Math Nobody Wants to Do
A founder told me his SDR costs $80K. He said it with confidence. He'd budgeted the salary and stopped there. I grabbed a napkin.
Base salary: $75K. Benefits and payroll taxes add 30% — call it $22K. Recruiting fee, amortized: $8K. Training and ramp, amortized over 14 months (the industry average tenure): $6K. Management overhead for a sales leader spending 15% of their time on this one person: $18K. Tools. Office. Attrition replacement risk. The Bridge Group pegs fully-loaded SDR cost at 1.7-2.5x base. That $80K salary is a $143K-$187K annual commitment.
He looked at the napkin. He didn't argue.
I'm not anti-SDR. I'm anti-math that doesn't work.
What the Stack Actually Costs
Here's the full line item breakdown for a real agentic B2B outbound funnel:
| Tool | Purpose | Monthly Cost | |---|---|---| | Apollo.io Basic | Prospect data, 30K enrichment credits | $49 | | Smartlead | Cold email sequencing, inbox rotation | $39 | | HubSpot CRM | Contact management, deal tracking | Free | | Claude / GPT-4o API | Personalization, research, copy | $20-30 | | Email infra (mailboxes, warming) | Deliverability infrastructure | $75-80 | | Total | | $183-198/mo |
That's it. Under $200 a month. The Apollo Basic plan includes unlimited email sending and 30,000 enrichment credits annually — enough to work 2,500 fresh prospects per month. Smartlead handles inbox rotation and warm-up so your deliverability doesn't crater. The AI API layer is where the work gets done.
How the Funnel Actually Runs
This isn't automation for automation's sake. It's a five-stage agentic loop.
Stage 1: Research. Apollo pulls a filtered prospect list based on your ICP — company size, industry, tech stack, hiring signals. You're not cold-calling random companies. You're reaching out to businesses that look like your best customers.
Stage 2: Enrichment and personalization. The AI API (Claude or GPT-4o) reads the company website, recent news, job postings, and LinkedIn signals. It writes a first line that references something specific. Not "I saw you're in HR tech." More like "Your VP of Sales post from March mentioned pipeline quality — that's exactly what we help fix." Personalization at scale used to mean a person. Now it means tokens.
Stage 3: Outreach sequencing. Smartlead runs the sequence across multiple warmed inboxes. Reply rates on cold email industry-wide have dropped below 2%. Good personalization plus good deliverability infrastructure gets you back to 4-6%. On a list of 500, that's 20-30 replies. You're not blasting. You're sniping.
Stage 4: Nurture. Replies that aren't "yes" aren't dead. HubSpot CRM catches every contact. The AI layer drafts follow-up messages based on the reply content. A "not now" gets a 30-day re-touch with new context. A "send me more info" gets a tailored case study sequence.
Stage 5: Handoff. When a prospect books a call, the CRM has the full conversation history, company research, and intent signals. You walk into the call knowing exactly what they care about.
This stack booked 22 demos in week three for a client I worked with directly. They'd been trying to hire an SDR for four months.
The Tools in Plain English
Apollo.io Basic ($49/mo) is a lead database with sequencing built in. The Basic tier is right-sized for solo founders and small teams running email-first outbound. You get 275+ million contacts, filters for intent data and technographics, and unlimited email sending credits. The enrichment credit ceiling (30K/year) is the binding constraint — plan your monthly volume accordingly.
Smartlead ($39/mo) is purpose-built for cold email at volume. Its inbox rotation and warm-up algorithms protect deliverability across multiple sending accounts. If Apollo is where you find prospects, Smartlead is where you reach them without landing in spam. Many serious outbound teams run Apollo for data and Smartlead for sending. The pricing model (per inbox, not per seat) makes it cost-efficient as you scale.
HubSpot CRM (Free) handles contact records, deal stages, and pipeline visibility. The free tier is genuinely useful for solo operators and small teams. You're not paying for Salesforce seats when you have five active deals.
Claude or GPT-4o API ($20-30/mo) is the intelligence layer. At typical usage volumes for a 200-500 prospect monthly pipeline, API costs stay well under $30. This handles prospect research synthesis, personalized email first lines, follow-up drafts, and objection-handling suggestions. The AI isn't running the funnel. It's doing the cognitive labor that used to take an SDR three hours a day.
Email infrastructure ($75-80/mo) covers mailbox rentals, domain warm-up, and monitoring tools. This is non-negotiable. Bad infrastructure kills even great copy. Budget 2-4 warmed mailboxes to rotate sending volume and protect your primary domain.
What You Still Have to Do
The stack doesn't replace judgment. It replaces labor.
You still define the ICP. You still review and approve the personalization logic. You still take the calls. You still close. The AI handles research, first drafts, sequencing, and follow-up. You handle relationships and deals.
The ratio shift is significant. An SDR might send 60 personalized emails a day at max capacity. This stack can process 500 prospects a month with better personalization, consistent follow-up, and zero sick days.
Ownership beats wages. Paying a human to do what software does better isn't noble — it's inefficient.
Common Objections, Answered Directly
"Our buyers won't respond to AI outreach." Your buyers respond to relevance. If the email references something specific to their business, they don't know — and don't care — whether a human or an AI wrote it. Reply rates confirm this.
"We need a human for relationship building." You need a human for calls and deals. You don't need a human to find leads, draft sequences, or manage inbox replies. Split the work correctly.
"The data quality from Apollo is bad." Apollo's Basic tier has solid enrichment quality for email outreach. Combine it with verification tools if you're seeing bounce rates above 3%.
"$200/month is too cheap to work." This is reverse snobbery. The stack's cost doesn't determine its output. Twenty-two demos in week three was real. The math works.
How This Compares to Hiring
A junior SDR at $65K base costs $110K-$140K fully loaded in year one. Ramp takes 3-6 months. Average tenure is 14 months before you're recruiting again.
This $200/month stack is operational in a week. There's no ramp. There's no turnover. The tools learn from what works without requiring a performance improvement plan.
That's not a small difference. That's a structural shift in how small B2B companies access pipeline.
For deeper context on building leaner AI-powered stacks across your business, see our breakdown of the AI marketing stack for owner-operators. If you're also solving for customer conversations post-demo, the AI customer support stack for B2B SaaS runs on a similar principle. And if you need the funnel to produce proposals automatically, the AI meeting-to-proposal pipeline closes that gap.
FAQ
Q: Does this stack work for enterprise B2B, or only SMB? A: It works for any deal where email is a valid first-touch channel. Enterprise often requires more personalization depth — budget $30-40 on the API layer and add LinkedIn outreach via a separate tool. The core stack holds.
Q: How many prospects can I run monthly at this budget? A: Realistically, 400-600 unique prospects per month. Apollo's 30K annual enrichment credits support 2,500/month. Keep your active sequence volume under 600 to protect deliverability.
Q: Is this legal? What about CAN-SPAM and GDPR? A: Cold B2B email is legal under CAN-SPAM when you include an opt-out and a physical address. GDPR is more complex for EU contacts — consult a lawyer if you're targeting European companies. Don't skip this step.
Q: What's the ramp time to first demo? A: One to two weeks to get infrastructure warmed and the first sequence live. The client I mentioned had demos in week three. That's realistic, not best-case.
Q: Can I add LinkedIn outreach to this stack without blowing the budget? A: Yes. Tools like Heyreach or La Growth Machine start around $50-75/month. That pushes your total to $250-275/month but adds a high-intent channel that converts differently than email.
Citations
- GTMLens, "The AI SDR Market Map: Q2 2026" — gtmlens.com/ai-sdr-q2-2026-market-map/
- Knowlee, "Apollo.io Pricing 2026: Free Plan Seats, Tiers & Real Cost" — knowlee.ai/blog/tools/apollo-io-pricing-2026
- Outbound Tools, "Apollo vs Smartlead (2026): Honest Comparison for Outbound Teams" — outboundtools.io/apollo-vs-smartlead-2026/
- Remote Growth Partners, "Real Cost of Hiring SDRs: In-House vs. Offshore 2026" — remotegrowthpartners.com/blog/real-cost-hiring-sdrs-in-house-vs-offshore-2026
- Fenix Co, "The Real Cost of Human SDRs in 2026" — fenixco.io/insights/the-real-cost-of-human-sdrs
- SkipCall, "SDR Salary US 2026: Base $50-70K, OTE $75-126K" — skipcall.io/en/blog/sdr-salary-us
- Koen Stam, "Part I: The AI-SDR Playbook" — koenstam.substack.com/p/part-i-the-ai-sdr-playbook