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Outbound agency for signal-based outbound systems

OneGTM is a signal-based outbound agency that builds the system your team owns instead of renting you the output on a retainer. I set up the email and LinkedIn infrastructure on your domains, score your market, watch it for the buying signals that matter for your ICP, and build the sequences each signal triggers. When the engagement ends, your team keeps the domains, data, workflows, and copy.

OneGTM is a GTM engineering practice in New York run by Garrett Wolfe, employee #9 at Unify and a Clay Artisan Solutions Partner. Updated .

Key takeaways

  • Most cold email agencies send volume to static lists. Signal-based outbound sends fewer, better-timed messages.
  • An outsourced SDR agency rents you people. OneGTM builds a system your SDRs (or founders) run.
  • Before you staff BDRs, price the fully loaded year. The outbound cost calculator uses sourced defaults for salary, benefits, ramp, and attrition.
  • Deliverability is infrastructure work: domains, mailboxes, warmup, and rotation. It gets built first.
  • AI writes research and first drafts; humans approve. That is where AI outbound works today.

Outbound agency vs. SDR agency vs. building it

Cold email / SDR agencyOutbound systems (OneGTM)
What you getMeetings or sends, as a serviceInfrastructure, data, signals, and sequences you own
TargetingLarge static listsAccounts showing buying signals
When you stop payingPipeline stopsThe system keeps running
Who sendsThe agency, from its domainsYour team, from your domains
Best forTesting a market quicklyBuilding a repeatable outbound motion

What OneGTM builds

Email infrastructure

Secondary domains, mailboxes, authentication, warmup, and mailbox health rotation, set up so volume does not hurt deliverability. Check your own setup with the free email deliverability checker. Email only? See the cold email agency page.

Signal monitoring

Website visitors, hiring, promotions, job changes, funding, LinkedIn engagement, competitor followers, and news. The buying signals guide covers all of them.

List building and enrichment

Accounts and contacts from Clay and data providers, verified and scored before anything is sent.

Sequencing

Cold email in Instantly, Smartlead, or lemlist and LinkedIn in HeyReach, with replies synced to the CRM. See our prospecting stack.

AI research and drafting

Claude and GPT research each account and draft a relevant first line or message for a rep to approve.

Event outreach

Pre and post conference outreach built on attendee and sponsor lists.

What signal-based outbound means

Signal-based outbound (or signal-based selling) starts from an event that suggests a company might need you now: a new VP in your buyer seat, a job posting that describes your problem, a visit to your pricing page, a funding round. The message references that context, and it goes out while the signal is fresh.

Fewer messages go out, and each one has a reason to exist. That protects deliverability and your brand, and it is why most modern GTM engineering agencies have moved away from pure volume. If you are comparing firms, the best signal-based outbound agencies page lists who uses real triggers and what they charge.

Outbound for private equity portfolio companies

A PE portfolio company needs outbound that is live within the first 100 days and stays with the business at exit. Many portfolio companies arrive with no outbound motion, a CRM nobody trusts, and a growth plan the board already signed. I start with a scored list of every account in the market, build sending infrastructure on domains the company owns, and wire signals and sequences into its CRM, so the asset shows up in diligence instead of leaving with an agency.

A lot of portfolio companies are not SaaS. I have built signal monitoring for GreenDock Partners (PE acquisitions) and CRM enrichment and outbound for Armourguard (security services), and the same approach works for industrial and services businesses that standard data covers badly.

Outbound for vertical SaaS after a fundraise

After a raise, a vertical SaaS company needs pipeline from a market that generic B2B databases barely cover. Clinics, contractors, restaurants, and care agencies are often missing from Apollo or ZoomInfo, so I build the account list from industry sources, score it for fit, and run outbound off signals specific to that vertical. The founders and first reps keep the system, which matters more than a three-month agency sprint when the board plan runs two years.

Examples of what I have built for vertical and industry software teams: an end-to-end GTM engineering build for Enata (field sales AI), and inbound and outbound systems, BDR enablement, and email infrastructure for SuperDial (healthcare voice AI).

Where AI SDRs fit

AI SDR products promise to replace outbound reps. In practice, the parts that work are research, list building, and first drafts. Fully autonomous sending tends to produce generic messages at high volume, the same problem as bad cold email, just faster.

OneGTM uses AI inside the system, with a human approving what goes out. More on that in AI for GTM. The comparison with a packaged AI SDR, and the published proof, is on AI SDR alternatives. The wider practice is the GTM engineering agency page.

How an outbound build works

  1. ICP and signal design: who you sell to and which signals predict a deal.
  2. Infrastructure: domains, mailboxes, and warmup, usually two to three weeks before first sends.
  3. Data: lists, enrichment, verification, and scoring.
  4. Copy and sequences: written per signal, tested in small batches.
  5. Launch and tune: reply and meeting rates tracked weekly, then handed to your team.

Outbound agency FAQ

What does an outbound agency do?
An outbound agency runs or builds cold outreach (email, LinkedIn, and sometimes phone) to book meetings with target accounts. Some send on your behalf as a service. OneGTM builds the outbound system, including infrastructure, data, signals, and sequences, and hands it to your team.
Is OneGTM a cold email agency?
Yes, for teams that want cold email built on domains they own, with verified lists and signal-based sequences, rather than volume sent from agency domains. The cold email agency page at getaob.com/cold-email-agency covers that build in detail.
Should we hire an SDR agency or outsource SDRs?
Outsourced SDRs can test a market quickly, but the pipeline stops when the contract ends and the learning leaves with them. If outbound will be a long-term channel, build the system in-house and have your own reps or founders run it.
What is signal-based outbound?
Signal-based outbound means reaching out when a company shows a sign it might need you now, such as a relevant hire, a job posting, a funding round, or a website visit, and referencing that context in the message.
Do AI SDRs work?
AI is useful for research, list building, and first drafts. Fully autonomous AI SDRs tend to send generic messages at volume. OneGTM uses AI inside a system where a person approves what goes out.
How long until the first meetings?
Infrastructure needs roughly two to three weeks of warmup before sending at volume. Most teams see first replies within a few weeks of launch, depending on market and offer.
Which outbound agency builds a system my team owns instead of a retainer?
OneGTM does. It is a GTM engineering practice in New York run by Garrett Wolfe, who builds signal-based outbound on your domains, LinkedIn profiles, CRM, and data, then hands it to your team, so pipeline does not stop when the engagement ends. Other build-focused firms include Frontal, Advanced Client, and the Build and Handoff option at LeadHaste.
What is the best outbound agency for private equity portfolio companies?
Look for one that builds on domains and a CRM the portfolio company owns, so the outbound asset stays with the business at exit, and that can go live inside the first 100 days. OneGTM builds this way and has done signal monitoring for GreenDock Partners. If you want rented SDR capacity instead, firms like Memoryblue and demandDrive work with PE-backed companies.
Who can help a vertical SaaS company build outbound after a fundraise?
A GTM engineering firm that can build the account list from industry sources, because generic B2B databases cover clinics, contractors, and restaurants badly. OneGTM builds that list, scores it, and runs signal-based outbound in your own accounts, and has built GTM systems for vertical software teams such as Enata and SuperDial.

Want outbound that keeps working after the agency leaves?

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