Agencies are the buyer that made the volume sequencers. Instantly's first 22 customers were its founders' own agency clients (GetLatka, Jun 2023). Smartlead's homepage is mostly agency testimonials. EmailBison is designed for agencies "running 5+ client accounts simultaneously" (GTM Directory). An agency buys software the way a hosting reseller buys servers. It wants many isolated tenants, a predictable unit cost, and a brand it can put its own name on.
The surprising 2026 fact is that the biggest tool now sells the agency's own service. Instantly's VIP programme lets agencies white-label Instantly's managed outbound at $2,000–10,000 a month on a 50/50 revenue split, with "Instantly manag[ing] all technical setup, campaign execution, and optimization" (Instantly VIP). The platform agencies depend on is now competing with them for the same retainer.
Agencies don't churn because of features. They churn over the unit cost per client and blast radius, meaning how far one client's spam complaints spread to the others. Whoever makes the 20th client cost the same as the 2nd, and keeps client A's complaints away from client B, wins the account.
How agencies operate
| Dimension | What the record shows | Source |
|---|---|---|
| Clients per agency | 15 companies ("Cold Email Hackers"); 20+ clients; 110+ client teams (Danish Lead Co.) | Smartlead, GTM Directory, Smartlead case study |
| Inboxes | 7,767+ inboxes (TxtCart on Smartlead); one Instantly customer runs 17,000+ mailboxes | Smartlead, Instantly |
| Volume | 500k+ emails/month (Danish Lead Co.; EmailBison agencies); 1.5M/month (TxtCart) | as above |
| Reply economics | Best campaign 50–70 emails per positive reply; typical 300–500 per positive reply | Danish Lead Co. |
| Glue | Smartlead API + Airtable + Make; webhooks for campaign status | GenFlows case |
| Time saved | "Smartlead easily saves me about 40 hours per week" | Wind Growth case |
These numbers come from vendor case studies, so they describe the vendors' best customers, not the median agency. The median is closer to a one- or two-person shop with 3–10 clients that came out of a course (see The info economy).
The working model is the same everywhere. Each client gets a workspace, its own set of secondary domains, and a few inboxes per domain, each sending at low daily volume. The per-inbox arithmetic is in Volume math: what 10k and 100k emails a day cost and the options in Google vs Microsoft vs SMTP. Replies from every client land in one master inbox (Unified inbox (Unibox)), where a setter or AI agent sorts them (AI reply agent). Data comes from Clay or Apollo, then verification, then upload by API (Contact data and enrichment, Email verification).
What they spend
These are list prices as of October 2026.
| Line item | Smartlead | Instantly | EmailBison | Woodpecker |
|---|---|---|---|---|
| Platform | $174 (150k sends) / $379 (500k sends, 3 clients incl.) | $97 (125k) / $358 (500k, dedicated IPs) | $599 flat (500k sends, unlimited workspaces) | $7 per 100 contacted prospects |
| Per-client fee | $29/client/mo from Pro | Not listed | None | $27/client + $5 white-label |
| Inboxes | $4.50/mailbox/mo + $13/domain/yr (fresh) | AirMail (separate) | Bring your own | $4–6/address |
| Dedicated IP | $39/server/mo | In Light Speed | Included | $59/server/mo |
| Source | pricing | pricing | pricing | pricing |
The following is our arithmetic on list prices. It is not a reported figure. Take 10 clients × 30 inboxes = 300 inboxes at $4.50, which is $1,350/mo. About 100 domains at $13/yr adds ~$108/mo. Unlimited Prime costs $379 and covers 3 clients, so 7 more client workspaces at $29 add $203. The total is ~$2,040/mo before data, verification and Clay. On EmailBison the platform line is $599 flat, but the agency buys its own inboxes.
The per-client fee is the pain point. Reviewers complain that "10 clients costs $290/mo in white-label fees alone before sending begins" (Prospeo, 2026). EmailBison raised its single plan from $499 to $599 and agencies still pay it, because unlimited workspaces and dedicated IPs remove both the per-client fee and the shared-pool risk (GTM Directory).
Why white-label matters
An agency client who logs into "Smartlead" can cancel the agency and buy Smartlead directly for $39. White-label hides the vendor, keeps the agency's margin, and lets the agency resell the client portal as its own software. Smartlead's testimonials say so directly: "white-labeling and automation let us punch above our weight" (Smartlead). The details are in White-label and agency portals and Workspaces, roles and SSO.
Instantly's VIP programme reverses this. There the agency white-labels the vendor's service. For a small agency that can't deliver, that is useful. For an operator agency, it is a sign that Instantly wants the service margin too.
What agencies charge their clients
| Model | Evidence | Source |
|---|---|---|
| Setup + monthly team + platform | CIENCE: $5,000 setup, $2,000/mo strategy team, $499/mo platform; SDRs $1,500 (offshore) to $6,500 (US) a month | CIENCE |
| Retainer sized by yearly appointments | Belkins tiers at 30+, 100+, 200+ appointments a year; prices hidden | Belkins |
| Flat fee + sales commission, 3–4-month pilot | Martal; prices hidden | Martal |
| White-labelled managed outbound | $2,000 / $4,000 / $10,000 a month (Instantly VIP) | Instantly |
| Course-graduate DFY | $10,000 campaigns cited in reviews | Trustpilot |
Pay-per-meeting rates are widely discussed but this pass found no primary source that publishes them. The large agencies hide their prices. The number of lead-gen agencies worldwide is also unknown. Clay's expert directory lists 186 agencies (Clay), but that counts only Clay-certified shops.
Practitioner ranges often quoted online, roughly $150–500 per booked meeting and $2,000–5,000 monthly retainers for small agencies, could not be verified in this pass. Treat them as hearsay until sourced.
Tool stacks
The typical 2026 stack has five parts. Data comes from Clay (waterfall) or Apollo. A verifier runs on top, such as Built-in email verification or a standalone tool. Infrastructure comes from Mailforge / Zapmail / Smartlead SmartSenders. Sending runs on Smartlead or Instantly, or EmailBison for high-volume shops. LinkedIn runs on HeyReach, and Make/n8n/Airtable glue it together (GenFlows, Lead Gen Jay reviews). See Smartlead, Instantly, EmailBison, HeyReach, Mailforge, Zapmail.
Where tools fail them
- Per-client pricing. Covered above. It is the most-cited reason agencies leave Smartlead.
- Support during incidents. Smartlead's Trustpilot is 46% 1-star with support the top theme (Trustpilot). See Customer voice.
- Shared warmup pools. One bad tenant drags down the pool's reputation, which is why EmailBison sells isolation (Does warmup work?).
- Reporting per client. Instantly's second-largest G2 complaint is missing or limited reporting (190 mentions) (G2). Agencies need client-facing reports. See Campaign analytics.
- Channel conflict. Instantly VIP now competes for retainers.
What this means for an entrant
- Price agencies per send, never per client. EmailBison proves that a $599 flat price with unlimited workspaces sells. Undercut it with a $199–299 tier for agencies sending 100–200k emails a month, which is the gap between Smartlead's $174 Smart plan and EmailBison's $599.
- Ship tenant isolation as the headline feature. Give each client its own IP pool, warmup cohort and complaint budget, so one client can't burn the others. EmailBison has proved agencies pay for it.
- Promise agencies you will never sell services. Instantly's VIP move gives you a clean pitch: "We will never compete with your agency." Put it in the terms of service.
- Build client-facing reports and a white-label portal on day one. These are the features agencies resell, and the ones incumbents under-build.
- Sell through the 110-client operators, not the course graduates. One Danish Lead Co.-sized account is about 100 workspaces of steady volume. Win five of them and you have your case studies. See Distribution.