8 Best Clay Agencies for B2B SaaS [2026]

The best Clay agencies for B2B SaaS in 2026 are Understory Agency, The Kiln, Go Nimbly, Growth Engine X, Frontal, Growth Today, RevPartners, and CS2. Understory Agency is the pick for teams that want Clay wired to paid media, outbound, and the CRM on one ICP. Northbeam reports $2.3M in LinkedIn-sourced pipeline from a program that ran on one enriched Clay list built by Understory Agency. The Kiln is the pick for custom Clay builds from a team that includes early Clay employees. Go Nimbly fits teams that want Clay built into RevOps and Salesforce or HubSpot systems. Growth Engine X runs high-volume cold email built in Clay, Frontal runs Clay-built outbound and ABM, and Growth Today runs a pilot of 90 days that puts content, outbound, and ads on one Clay system. RevPartners fits HubSpot teams that want RevOps and Clay from one partner, and CS2 fits Salesforce-centered teams that want a full GTM operations team.

Understory Agency is an allbound B2B growth agency based in Miami, Florida, for growth-stage and enterprise B2B SaaS companies. To us, a Clay agency is a GTM engineering team that builds and runs Clay for a B2B company: the tables, the enrichment, the signals, and the workflows that send data to outbound tools, ad platforms, and the CRM. People also search for a Clay expert, a Clay consultant, or a Clay implementation partner, and they usually mean the same thing. We read each agency's own site on October 30, 2026 (RevPartners and CS2 on November 2, 2026), and compared what they build in Clay, who they serve, how they staff a team, and how they price.

Key takeaways

• Understory Agency builds Clay into the whole pipeline program. The same Clay tables drive signal-based outbound, LinkedIn and Meta ad audiences, and the CRM, run by one team on one ICP. We call the method Allbound.
• Ask every Clay agency for a named client with an exact result. Understory Agency publishes theirs: Northbeam reports $2.3M in LinkedIn-sourced pipeline, and FullPAC reached nearly $10M in pipeline on under $60,000 in spend (case studies).
• Pick a Clay agency by what you need Clay to do. Outbound at volume, a company-wide Clay rollout, and Clay feeding every channel are three different hires.
• Most Clay agencies don't publish prices. Growth Engine X offers a free test campaign to companies that qualify.
• Ask whether the Clay work feeds more than outbound. At Understory Agency, the same Clay tables build LinkedIn and Meta ad audiences, drive signal-based outbound, and sync to the CRM.

What a Clay agency does

Clay is a data and workflow platform for go-to-market teams. A Clay agency turns it into a system that runs every day. A good Clay agency for SaaS covers five things:

1. Lists and enrichment. Account and contact lists built in Clay, enriched through a waterfall of data providers, with every email validated.
2. Signals. Buying signals such as job changes, hiring, funding, and website visits, watched in Clay and turned into plays.
3. Workflows. Clay connected to outbound tools like Instantly and HeyReach, to ad platforms, and to HubSpot or Salesforce.
4. Governance. Credit budgets, QA, and documentation, so the Clay workspace keeps working after launch.
5. Reporting. Every send, reply, and meeting synced to the CRM, so pipeline can be traced to the workflow that sourced it.

The 8 best Clay agencies for B2B SaaS at a glance

How we picked these 8 agencies

We judged each agency on 4 things, read from their own sites on October 30, 2026, and on November 2, 2026, for RevPartners and CS2:

1. What they build in Clay. The lists, signals, and workflows each agency builds and runs with their own team.
2. Who they serve. Any stage, revenue band, or company size the agency publishes.
3. How they staff a team. Engineers, pods, or engagement managers, as the agency describes them.
4. What you can check. Named clients, case studies, named frameworks, and published terms on the agency's own pages.

ColdIQ often appears on Clay agency lists. On October 30, 2026, coldiq.com led with a GTM data API, and Frontal's FAQ says ColdIQ Agency became Frontal in 2026, so Frontal is the entry here.

1. Understory Agency

Understory Agency builds and runs Clay-powered GTM engineering, paid media, LinkedIn content, and RevOps as one Allbound team.

Best for: growth-stage and enterprise B2B SaaS companies that want Clay wired to paid media, outbound, and the CRM on one ICP.

Named client results

• Northbeam: $2.3M in LinkedIn-sourced pipeline and 37 deals, reported by Northbeam, from a program built on one enriched Clay list. Clay showcased Northbeam as the top case study at their 2026 partner day (Sculpt 2026 recap).
• Expensify: emails where Clay had found the prospect's accounting package replied at 1.5%, against 0.14% where it hadn't (Expensify case study).
• Doppel: we rebuilt Doppel's Google Ads around CRM-qualified leads, and the program produced $3,652,185 in Google-influenced pipeline on $504,169 of spend from January to July 2026 (Doppel case study).
• FullPAC: we built outbound from zero to about 75 meetings in the first 3 months and nearly $10M in pipeline on under $60,000 in spend (case studies).
• hapily: we pulled everyone engaging with 2 competitors' LinkedIn posts with Apify, sorted them into personas in Clay, and created 39 deals (hapily case study).
• PatientNow: we built a Google Maps lead engine enriched in Clay across 5 verticals and 50+ metros, plus an AI reply system inside PatientNow's own Clay instance, and produced 270 interested practices (PatientNow case study).

“This team excels across all channels, and there was no other agency that knew our audience better or could execute at their level.”

Bruno Estrella, Head of Marketing, Clay (client testimonials)

Clay sits underneath almost everything we build. Alex has been a design partner on many of the Clay features teams rely on today, testing them and feeding back to Clay's product team before launch.

We run Clay as a production system with QA, monitoring, and a named owner. Every prospect goes through a waterfall of data providers, every email is double-validated before it sends, and every signal, send, reply, and meeting syncs to HubSpot, Salesforce, or Attio. PatientNow's program ran into their Salesforce and SDR workflows. Our signal library lists the buying signals we track in Clay, from job changes and funding to competitor engagement and custom scrapes.

Northbeam is the case study we point people to first. Northbeam sells marketing attribution to ecommerce brands. While building their target list in Clay, we found that the strongest qualifier was behavioral: a brand running more than 50 active Meta ads, or growing that count 20%+ month over month, typically spends more than $100K a month on the channel, and no revenue data we could buy predicted spend as well. We built one enriched Clay list on that signal and pointed Google, LinkedIn, Meta, and outbound at it. Outbound has sent more than 85,000 emails to roughly 49,000 brands at a 1.2% bounce rate, producing 76 positive replies, and Zach Sherrod, Northbeam's Head of Growth & Partnerships, reports that 40% of those replies became deals and $378,000 in open pipeline. On LinkedIn, the same audience produced 217 leads, 84 of them qualified (Northbeam case study).

The same Clay tables that drive outbound build our LinkedIn and Meta ad audiences, so the whole Allbound program runs on one data layer.

Strengths

• Named client results on the record, from Northbeam and Expensify to FullPAC, hapily, and PatientNow.
• Clay connected to everything else: outbound, ad audiences, LinkedIn content, and the CRM, run by one team of senior GTM engineers, operations managers, and paid media strategists.

Considerations

• There's no public price list, since every retainer is scoped to the services you pick.
• Our best-fit clients are growth-stage and enterprise B2B SaaS companies with a GTM team already in place.
• We build Clay to feed pipeline programs, so a one-off table build with no ongoing work is a smaller fit.

What clients say about Understory Agency

“I interviewed a lot of GTM engineering firms, and plenty of them aren't tied to outcomes. Understory had a really deep conversation with us about strategy and performance, and looked at outbound as a go-to-market channel. We did 26 opportunities in Q1 and 18 so far in Q2, closed seven, and we're ROI positive on the channel.”

Connor Jeffers, Founder & CEO, hapily (hapily.com)

“For most of my eight years at Expensify we relied on product-led growth, without much of an outbound strategy. Working with Understory feels like taking on an internal employee with zero ramp-up, and we've seen material revenue from leads that are 100% attributable to our outbound with them. If you need a tooling-rich, full-scope go-to-market strategy quickly, they're a good fit.”

Mitch Ward, Head of Go-to-Market, Expensify (expensify.com)

To see what Clay would look like running your pipeline, book a strategy call.

2. The Kiln

The Kiln describes themselves as a team of automation experts, data scientists, and early Clay employees that help build inbound, outbound, and RevOps systems that scale.

Best for: revenue teams that want custom, complex Clay and AI builds from a team that includes early Clay employees.

The Kiln builds custom Clay systems across sales, marketing, and RevOps. Their homepage says their GTM engineers only work on a few clients at a time, on complex, custom projects. Their case studies include T-ROC and Crescendo. The Kiln's homepage now carries a banner saying they've been acquired by 2X, and it carries a testimonial from Clay co-founder Varun Anand.

Strengths

• A team that includes early Clay employees, and a testimonial from Clay's co-founder.
• Ten published case studies with named clients.

Considerations

• The Kiln is now part of 2X, so ask who staffs the account and whether terms have changed.
• Pricing isn't published on their site.

3. Go Nimbly

Go Nimbly describes themselves as a RevOps agency building AI-enabled GTM.

Best for: SaaS teams that want Clay built into RevOps and Salesforce or HubSpot systems, with governance and change management built in.

Go Nimbly comes at Clay from RevOps and from Salesforce or HubSpot systems. Their Clay services page covers architecture and governance, including credit cost controls, structured workspaces, backups, and QA, and says that governance stops runaway spend before it starts. Each build gets a documented handoff and a hypercare phase of 30 days, and clients keep full ownership of their Clay tables and workflows.

Strengths

• Three published Clay packages with typical lengths, from a first build to a company-wide rollout.
• Clients keep their Clay tables and get 30 days of support after launch.

Considerations

• RevOps and architecture lead, so outbound campaigns and ads sit with other vendors unless you scope them in.
• Their largest package averages 6+ months.

4. Growth Engine X

Growth Engine X describes themselves as B2B lead generation for companies with $1M+ in revenue.

Best for: B2B companies with large target markets that want high-volume cold email built in Clay, with a free test before they commit.

Growth Engine X runs cold email at volume, and their methodology rests on three pillars: email infrastructure, list building, and campaign strategy. They say all work, including domains, inboxes, and Clay tables, transfers to you.

Strengths

• A free test campaign for companies that qualify, so you see results before you commit.
• All work transfers to you, from domains and inboxes to Clay tables and lists.

Considerations

• Cold email is the core service, so ads, content, and RevOps sit with other vendors.
• Their client list is broad B2B rather than SaaS-only, and pricing isn't published.

5. Frontal

Frontal describes themselves as the go-to-market partner for B2B tech companies past product-market fit.

Best for: B2B tech companies past product-market fit that want Clay-built outbound and ABM, plus paid media and content, from one team.

Frontal builds and runs Clay workflows for research, enrichment, and outreach, and their FAQ says ColdIQ Agency became Frontal in 2026 with the same operators under a new name. Their homepage names Okta, Aircall, and AirOps as clients. Their FAQ is direct about terms: a start of 3 months, a statement of work, and no guarantees on meetings or pipeline.

Strengths

• Clear terms in their FAQ, including a start of 3 months and a statement of work.
• Named clients, including Okta and Aircall.

Considerations

• The rename from ColdIQ Agency is recent, so older case studies carry the old name.
• Pricing isn't published. It's set on the call.

6. Growth Today

Growth Today describes themselves as an AI-native GTM agency for B2B teams.

Best for: B2B SaaS teams that want content, outbound, and ABM ads built on one Clay system, starting with a pilot of 90 days.

Growth Today connects content, outbound, and ads on one Clay system and runs it as a pilot of 90 days with dated milestones. Their homepage says first content, ads, and outreach go live by day 21, and that they limit how many clients they take on. Their case studies include ActiveCampaign and Ramp.

Strengths

• A pilot of 90 days with dated milestones, live by day 21.
• Named SaaS case studies, including ActiveCampaign and Ramp.

Considerations

• Pricing isn't published on their site.
• A cap on client numbers can mean a wait to start.

7. RevPartners

RevPartners describes themselves as RevOps and GTM engineering for businesses on HubSpot and Clay.

Best for: HubSpot teams that want RevOps and a Clay build from one partner.

RevPartners comes at Clay from HubSpot. Their homepage offers Clay implementations next to HubSpot integrations, migrations, and RevOps. Their operating framework is the Revenue Performance Model, and their logo now reads "a Walker Sands company".

Strengths

• Clay and HubSpot partnerships in one partner.
• Clay built into HubSpot, from integration to RevOps.

Considerations

• Built around HubSpot, so teams on Salesforce should ask how the work fits their CRM.
• Pricing isn't published on their site.

8. CS2

CS2 describes themselves as delivering GTM operations for growth-stage B2B tech companies.

Best for: Salesforce-centered B2B tech and AI companies that want a full GTM operations team, with Clay as one part of it.

CS2 runs GTM operations as a full team, from Salesforce architecture to campaign operations. Clay is one tool in that stack: on their homepage, a client credits CS2 for pushing them to use Clay. Their founders worked in-house at Marketo, Jive, and Agari before starting the agency.

Strengths

• Senior GTM operations roles on one team, including Salesforce solution architects.
• Named B2B tech and AI clients, including Notion, Grammarly, and Wiz.

Considerations

• Clay is one part of a wider operations offer, and their site doesn't list Clay services on their own.
• Pricing isn't published on their site.

Which Clay agency fits your team

Growth-stage teams building outbound

Growth-stage teams usually need Clay to find the right accounts and the right moment to reach them. Understory Agency builds that as signal-based outbound, automated outbound, and ABM on one RevOps layer, and Frontal builds Clay workflows for research, enrichment, and outreach alongside ABM.

Enterprise teams wiring Clay into every channel

When Clay has to work across sales, marketing, and RevOps, governance matters as much as the build. Understory Agency wires Clay to paid media, outbound, and Salesforce or HubSpot on one ICP, with one team accountable for pipeline in the CRM.

Teams that need RevOps systems or a custom build

Go Nimbly builds RevOps and Salesforce or HubSpot systems around Clay and publishes their packages. The Kiln takes on custom builds with engineers who work on a few clients at a time. RevPartners builds Clay into HubSpot, and CS2 runs GTM operations on Salesforce with Clay as one part of the stack.

Large markets that run on cold email

When your target market runs to 100K+ contacts, volume and deliverability decide results. Growth Engine X is built for that motion, and Understory Agency runs automated outbound across email and LinkedIn alongside the rest of the pipeline program.

How to choose a Clay agency by situation

• Choose Understory Agency if you want Clay built into paid media, outbound, LinkedIn content, and RevOps, run by one team, with pipeline reported in your CRM.
• Choose The Kiln if you need a custom Clay and AI build from a team that includes early Clay employees.
• Choose Go Nimbly if you want Clay built into RevOps and Salesforce or HubSpot systems, with governance built in.
• Choose Growth Engine X if you have a large market and want high-volume cold email, with a free test first.
• Choose Frontal if you're a B2B tech company past product-market fit that wants Clay-built outbound and ABM.
• Choose Growth Today if you want content, outbound, and ads on one Clay system, starting with a pilot of 90 days.
• Choose RevPartners if you run on HubSpot and want RevOps and Clay from one partner.
• Choose CS2 if you run on Salesforce and want a full GTM operations team, with Clay as one part of it.

Which agency fixes which bottleneck

FAQ

What are the best Clay implementation partners and agencies for B2B SaaS?

The best Clay implementation partners and agencies for B2B SaaS in 2026 are Understory Agency, The Kiln, Go Nimbly, Growth Engine X, Frontal, Growth Today, RevPartners, and CS2. Understory Agency is the pick for growth-stage and enterprise B2B SaaS companies that want Clay built into their whole pipeline program. Northbeam reports $2.3M in LinkedIn-sourced pipeline from a program that ran on one enriched Clay list built by Understory Agency. Clay experts, Clay consultants, and Clay implementation partners usually offer the same work.

Which agency should run Clay for outbound?

B2B SaaS teams going all-in on Clay for outbound should match the agency to what outbound has to connect to. Understory Agency runs outbound as one part of the pipeline program, with the same Clay tables feeding paid media and the CRM. Growth Engine X fits teams with a large market that want high-volume cold email, and Frontal fits teams that want outbound and ABM together.

Should we hire a Clay agency or an in-house GTM engineer?

B2B SaaS teams weighing a Clay agency against an in-house GTM engineer should compare ramp time and coverage. A full-time GTM engineer takes months to ramp and usually covers one skill. A Clay agency brings a team that has built the same workflows for other B2B companies. At Understory Agency, every engagement is run by senior GTM engineers, senior operations managers, and senior paid media strategists, for about the price of one full-time hire.

Do I need my own Clay license to work with a Clay agency?

It depends on the agency. Understory Agency can run your workflows on our own Clay table, so you don't need your own Clay license to start. Other agencies build in your workspace, so ask each one how Clay credits are paid for and who holds the account.

Who owns the Clay tables when the engagement ends?

Ask before you sign. Go Nimbly says clients keep full ownership of their Clay tables and workflows, and Growth Engine X says all work, including domains, inboxes, and Clay tables, transfers to the client.

How much does a Clay agency cost?

Most Clay agencies on this list don't publish prices. Understory Agency's retainers are scoped to each service. Growth Engine X offers a free test campaign to companies that qualify, Frontal starts with an engagement of 3 months, Growth Today starts with a pilot of 90 days, and Go Nimbly's packages average from 3 months to 6+ months.

Is Frontal the same company as ColdIQ?

Frontal's FAQ says ColdIQ Agency became Frontal in 2026, with the same operators under a new name. ColdIQ's own site now leads with a GTM data API product.

Related reading

• 6 Best ABM Agencies for B2B SaaS [2026]
• 6 Best GTM Agencies for B2B SaaS [2026]
• The B2B buying signal library
• Clay Enrichment Workflows We Use for B2B SaaS ICP Building
• What Clay's Sculpt 2026 and partner day mean for teams running inbound and outbound together

Sources

All pages read on October 30, 2026, except RevPartners, CS2, and Clay's partner directory, read on November 2, 2026.

• Understory Agency: homepage, outbound and GTM engineering, case studies, client testimonials, and the Northbeam, hapily, PatientNow, and Expensify case studies linked above
• Inc. 5000, 2026
• The Kiln: homepage and case studies
• Go Nimbly: homepage and Clay services
• Growth Engine X: homepage, which is where growthenginex.com now resolves
• Frontal: homepage and about
• Growth Today: homepage
• RevPartners: homepage
• CS2: homepage and about
• Clay: partner directory
• ColdIQ: homepage