We tried outbound ourselves for months with minimal results. closed:in came in, rebuilt everything from scratch, and within 4 weeks we had qualified meetings on the calendar.
closed:in built us an outbound machine we could never have created internally. Within weeks we had conversations booked with exactly the type of e-commerce founders we wanted to reach. The campaigns performed so well that we had to expand our team just to keep up with demand.
closed:in unlocked an ICP we couldn't reach through normal channels. The pipeline volume was so high that we delayed international expansion just to handle the demand.
closed:in cracked the part of our market we couldn't reach on our own: physical retail stores. They turned a slow word-of-mouth channel into a predictable pipeline of purchasing managers booking meetings every week. Within months we had real traction across the Netherlands.
Signals in your market trigger the outreach. Replies turn into meetings in your calendar and records in your CRM.
[01]Buying signals
Every buying signal starts an outreach.
A new sales leader, a funding round, a move into a new market: we catch the moment a company is ready to talk, and write the first line from what just happened.
Enrichment LiveFinds the decision-maker, scores the firm against your ICP
Fits ICP 41Out of scope 145
Copy 41 writtenEach first line built on the signal itself
Ready to send
Outreach SendingLinkedIn and email, from your own domains
New Head of Sales hired
Closed a Series A
Opened a second office
Job post: first SDR
Entered a new market
Speaking at an industry event
Visited your pricing page
New CFO appointed
120+ data providersthrough Clay, refreshed daily, verified before the first send
[02]Reply to meeting
Every reply becomes a meeting on your calendar.
Interested replies get answered within the hour, objections get a second angle, and every outcome lands in your CRM. Your team walks into the meeting with the context.
The first week we already had amazing results. Reply rate went through the roof. Over the period we got around 250 separate boutiques interested in putting Endresz in their store.
Ronne van RijnMarketing, Endresz
What really stood out, compared to other partners we work with, is the level of creativity in finding the list. Digging in, understanding the business and then finding creative ways to reach customers. We have a 4% positive reply rate from all the outreach.
Mikel PalokajCo-founder, True Performance Network
You were definitely willing to go the extra step, and to think creatively about solutions. The price for the whole project was a lot lower than what we spent on Meta in that period. Everything is spot on.
Nick VerhulsdonckCo-Owner, WeTaxus (translated from Dutch)
We went from loose Excel lists to one uniform HubSpot system we can now work in comfortably, with thousands of new potential clients and their phone numbers.
Laura WolfEvent manager, Sustainable Motion (translated from Dutch)
It brought about clarity in the early discovery phase. Definitely. We now know exactly which developers to match with which companies.
Leva KonatéFounder, Sankore Labs
Working with closed:in was a seamless experience. Their ability to merge outreach with functionality resulted in opportunities that not only filled our pipeline but also converted.
EJ
Erik JorgensenCEO, Verzendbazen
FAQs
Frequently Asked Questions
What does closed:in do?
closed:in is a GTM engineering agency in Amsterdam. We build and run outbound sales systems for B2B companies, combining cold email (Instantly), LinkedIn outreach, lead enrichment (Clay), website visitor tracking and CRM orchestration into one managed engine. Most clients see qualified meetings booked within 2-3 weeks.
How is closed:in different from a traditional cold email agency?
Traditional cold email agencies send volume. closed:in is a GTM engineering agency, meaning we build a full outbound system on top of your CRM. That includes enriched, signal-based lead lists via Clay, multi-channel sequences across email and LinkedIn, deliverability infrastructure, and reply handling wired straight into your sales pipeline.
What kind of companies do you work with?
B2B service companies, SaaS founders, recruitment and PE firms, agencies and product companies selling into mid-market and enterprise. Our clients usually have an average contract value of EUR 5K or more and need a predictable, repeatable way to book qualified meetings without hiring an in-house SDR team.
How fast do you deliver results?
Setup of infrastructure takes 2 to 3 weeks (domains, inboxes, warmup, lists, copy, sequences). Most clients get their first qualified meeting within 2-3 weeks of launch. Documented case studies show 78 to 247 opportunities per engagement, with pipeline values from USD 128K to EUR 1.56M.
Which tools and platforms does closed:in use?
Core stack: Instantly for cold email, Clay for enrichment and orchestration, Close CRM for pipeline management, Apollo and Sales Navigator for sourcing, and LinkedIn for direct outreach. We are a Clay Solutions Partner, an Instantly Certified Expert and an Apollo Partner.
Where is closed:in based and which regions do you serve?
closed:in is based in Amsterdam, Netherlands. We run campaigns worldwide. The Netherlands, Belgium, the United Kingdom, the broader European market and the United States, in English, Dutch or other local languages depending on the target country.
How do I get started?
Book a 30 minute discovery call. We'll review your current outbound setup, your ICP and your goals, and confirm whether closed:in is a fit before sending a tailored proposal.
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Most Innovative B2B GTM Engineering Agency 2026
Mikel PalokajCo-founder, True Performance Network
