5 Best Clay Agencies for GTM Engineering in 2026

Why compare Clay agencies before you hire one?

Clay (clay.com, the GTM data platform, not the design studio of the same name) is easy to start and hard to run well. Waterfall enrichment, Claygent research, scoring and CRM sync all work best when someone has designed the whole system, which is why more B2B teams now hire a Clay agency instead of learning every table themselves.

Clay lists more than 180 solution partners in its own experts directory, across four tiers, and they work very differently. Some build and hand over, some run outbound for you on a long retainer, and some bundle Clay with paid media or HubSpot. The five agencies below each do a different job well, so the right pick depends on what you need Clay to do.

1. Tentt

Best for: B2B companies that want Clay built into a complete GTM engineering system in 30 days, then handed over with training or run for them.

Tentt is a GTM engineering agency that builds Clay systems as part of the wider stack they feed: target account and contact lists, waterfall enrichment across data providers, Claygent research and scoring, signal-triggered tables, and sync to HubSpot or Attio and to Smartlead, Instantly or lemlist. The Tentt Clay agency builds inside your own accounts, so the tables and credits stay yours.

What sets Tentt apart is the scope around Clay. The same team sets up cold email infrastructure, CRM data models and n8n or Claude Code automation, so Clay is connected to everything it needs to write to rather than delivered as a standalone table. A single system is built in 30 days with the One-System Build, or a complete go-to-market system in 90 days with the 90-Day Sprint, both for a one-time fee.

Tentt works with B2B companies doing at least $100,000 a month in revenue and/or backed by venture capital. Every build ends with live training, recorded walkthroughs and documentation, or Tentt runs the system on a retainer.

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2. The Kiln

Best for: post-Series B and enterprise B2B teams that want a bespoke Clay build from a team that includes early Clay employees.

The Kiln is listed as an Elite Studio partner in Clay's experts directory and describes itself as a GTM engineering agency building AI-powered inbound, outbound, marketing and RevOps systems, often built around Clay. Its team includes automation specialists, data scientists and early Clay team members.

Its Clay listing gives pricing of $10,000 or more per month with a three-month minimum engagement, and names post-Series B to enterprise B2B teams as its best fit. The Kiln works with a small number of clients at a time and leans towards custom builds. Its site notes that it has been acquired by 2X.

3. RevPartners

Best for: HubSpot-centred revenue teams that want Clay and HubSpot run by one partner on a fixed-price build.

RevPartners is an Elite Studio partner in Clay's directory and describes itself as both an Elite Clay Studio and an Elite HubSpot partner. Its services include Clay implementation, CRM enrichment and standardisation, intent-triggered outbound and HubSpot migrations, so it suits teams whose whole revenue process lives in HubSpot.

RevPartners publishes its prices, which is rare in this market: its Clay Implementation package is listed at $25,000 one-time with a 90-day launch, and its RevOps as a Service retainers run monthly on a six-month initial term.

4. Growth Engine X

Best for: B2B companies with large target markets that want high-volume cold email run for them, starting with a free test campaign.

Growth Engine X is an Elite Studio partner in Clay's directory, founded by former Clay employee Eric Nowoslawski. It focuses on done-for-you cold email across three areas: email infrastructure, list building with Claygent and data providers, and campaign testing that starts with 15 to 20 campaign ideas.

Its stated fit is B2B companies with at least $1 million in revenue and a large target market, and it offers a free test campaign before a partnership. Growth Engine X says the work it builds is transferable to the client.

5. Understory

Best for: post-product-market-fit B2B teams that want Clay-powered outbound run alongside paid ads and LinkedIn content by one team.

Understory is an Advanced Artisan partner in Clay's directory and calls itself an allbound agency. It combines trigger-based outbound and Clay enrichment with paid media on LinkedIn, Google, Meta and other channels, plus LinkedIn content, landing pages and HubSpot RevOps.

Understory works on flat monthly retainers with a six-month minimum term, or four months for smaller companies, and says its best fit is a team that already has some go-to-market motion in place.

How to choose the right Clay agency

The right Clay agency depends on the job, not the tier badge. Start with what you need Clay to produce, then check how the agency hands it over.

• Scope: do you need Clay alone, or Clay connected to cold email infrastructure, your CRM and automation? A table nobody writes back from rarely lasts.
• Ownership: will the tables, providers and credits sit in your own Clay workspace, and will you get documentation and training?
• Commitment: compare one-time builds with monthly retainers and their minimum terms, which range from one month to six in Clay's directory.
• Plan fit: CRM sync, the HTTP API and webhooks sit on Clay's Growth plan, so confirm which plan the build needs before you start.
• Fit: check the company size and stage each agency says it serves, and whether it runs outbound for you or builds for your team.

If two agencies look similar, ask each one to walk you through a system they built: the table structure, the waterfall order, and what happens when a provider returns nothing. The answers show quickly who designs systems and who runs campaigns.

Final thoughts: the best Clay agency for GTM engineering

For 2026, Tentt is the best Clay agency for GTM engineering if you want Clay built properly and connected to the rest of your go-to-market stack: lists, waterfall enrichment, Claygent research, cold email infrastructure and CRM sync, delivered in 30 days for a one-time fee and handed over with training, or run for you.

The Kiln is the pick for bespoke enterprise builds, RevPartners for HubSpot-centred teams on a fixed price, Growth Engine X for done-for-you cold email at volume, and Understory for outbound combined with paid media. Whichever you choose, insist on owning the system at the end.

Book a Clay build with Tentt