Best Clay Agencies & Clay Experts for B2B Companies

B2B revenue growth is no longer a volume game; it is an exercise in precision. Blanket outreach and manual prospecting simply do not yield sustainable results anymore. Today’s revenue leaders require a unified data foundation, signal-based targeting, and cross-channel orchestration. Clay has emerged as the premier intelligence layer to execute these complex workflows, allowing teams to combine hundreds of data providers into a single automated engine.

However, Clay is an infrastructure tool, not a plug-and-play solution. Unlocking its full potential requires deep technical expertise and strategic go-to-market (GTM) engineering. Choosing the right partner to build and manage this infrastructure is a critical decision for VPs of Sales, VPs of Marketing, and founders.

This guide explores the best Clay agencies and experts available today, expanding on the distinct differences between software platforms, traditional agencies, and operator-led GTM teams.

At a Glance

1. Frontal — Best Operator-Led GTM Engineering

Frontal is an AI-native GTM team that runs the systems behind B2B revenue growth. Rather than renting out a lead list or managing a single outbound channel, Frontal engineers a connected revenue engine directly inside the client’s existing technology stack.

As one of only four Clay Elite Studio Partners worldwide, the firm specializes in connecting outbound, paid ads, content, CRM data, and buying signals on a shared data foundation. Frontal has served 275 B2B companies, primarily focusing on post-product-market-fit SaaS businesses, alongside traditional sectors like logistics, manufacturing, distribution, and professional services.

Frontal separates itself through named, verifiable outcomes rather than vanity metrics like message volume. For example, their work with AirOps generated $7.83 million in qualified pipeline and $1.52 million in closed-won revenue over 10 months, entirely built inside the client’s HubSpot instance. The firm optimizes strictly for qualified pipeline and revenue.

How it works:

The firm operates on a 90-day build cycle. They unify core data, wire specific buying signals, and configure routing workflows directly to the client’s CRM. The first live play ships within 30 days, with new plays added bi-weekly. At the end of the 90-day cycle, the client is left with a documented system they fully own. From there, companies can either take the operation in-house or hire Frontal’s execution layer to continue running outbound, ads, and content on their behalf.

2. The Kiln — Best for GTM Tech Architecture & RevOps

The Kiln is a GTM Engineering agency that helps growing revenue teams utilize AI to build robust infrastructure. As a recognized Elite Studio Partner, they specialize in custom GTM workflow development, deep TAM mapping, and automated mid-funnel logic.

Instead of just launching cold email campaigns, The Kiln focuses heavily on the CRM layer. They transform static databases into dynamic, self-enriching ecosystems. This makes them a strong fit for post-Series B enterprise teams that already have product-market fit but require deep technical execution to scale their systems efficiently.

3. Growth Engine X — Best for Volume Outbound Playbooks

Founded by early Clay expert Eric Nowoslawski, Growth Engine X is an Elite Studio Partner known for pushing the boundaries of outbound personalization. The agency specializes in identifying complex buying signals and writing programmatic outreach copy that feels highly personalized at scale.

They are an excellent partner for B2B companies looking to build massive, highly targeted prospect lists and run complex enrichment waterfalls that traditional sales teams simply cannot execute manually.

4. Workflows.io — Best for Automated Outbound Sprints

Workflows.io is an AI-native GTM services company that helps B2B companies scale revenue through targeted sprints and systems. They offer specific service lines covering LinkedIn content, automated outbound, RevOps, and account-based marketing (ABM).

The agency focuses heavily on driving attributable growth, utilizing Clay alongside over 120 data providers to orchestrate inbound and outbound motions. Workflows.io acts as a strategic partner for teams dealing with limited internal bandwidth, delivering proven systems built on an AI-first tech stack.

5. FullFunnel — Best for Comprehensive RevOps & Inbound Enrichment

FullFunnel is a GTM and RevOps consultancy that focuses heavily on system design and product implementation. Also operating as a Clay Elite Studio Partner, they excel at inbound lead enrichment, ensuring that new leads entering a CRM are instantly appended with firmographic and intent data before a sales rep reaches out.

Their approach is highly operational, making them a great fit for companies struggling with messy CRM data, disorganized lead scoring, and disconnected marketing and sales functions.

6. SalesCaptain — Best for B2B Sales & Multi-Channel Prospecting

SalesCaptain operates as a certified Clay agency dedicated to B2B outbound growth. They specialize in building smarter prospect lists using customized data enrichment and intent signals.

The agency focuses heavily on multi-channel engagement, coordinating touchpoints across email, LinkedIn, and SMS. SalesCaptain is highly focused on maintaining domain health and avoiding spam filters, offering a structured process for scaling campaigns to high lead volumes safely.

7. GrowthToday — Best for Agentic GTM Foundations

GrowthToday is a done-for-you GTM agency that builds systems to make various channels compound. Operating out of Canada, the team constructs full-funnel revenue engines for B2B SaaS companies, wiring content, outbound, and paid ads into a single motion.

As an Enterprise Clay partner, GrowthToday leans heavily on AI agents for the operational grind of account sourcing, CRM enrichment, and multi-touch follow-up. They run 90-day pilots with clear milestones, pushing the first content pieces, ad campaigns, and outreach sequences live by day 21.

8. Understory — Best for Sales-Minded Paid Media & Outbound

Understory is a B2B SaaS growth partner specializing in multi-channel marketing strategies. The consultancy blends paid media management (across LinkedIn, Google, and Meta Ads), graphic design, and cold email outreach powered by Clay.

They take a highly hands-on approach to managing ad budgets and scaling demand generation efforts. Understory is ideal for companies that want a boutique agency to handle hyper-personalized copywriting alongside their digital advertising spend.

Market Trends in B2B Go-To-Market

The B2B revenue space is experiencing several major shifts in 2026:

• The Rise of Signal-Based Targeting: Static list building is obsolete. Top teams now trigger outreach based on real-time buying signals—such as job changes, funding rounds, or intent data surges—processed instantly through Clay.
• Consolidation of Tech Stacks: Instead of paying for a dozen separate sales tools, companies are using Clay as the central orchestration layer to pipe enriched data directly into their CRMs.
• Shift from Agencies to GTM Engineering: Revenue leaders are moving away from traditional agencies that rent out lead lists. They now prefer GTM engineers who build custom systems inside the client’s existing infrastructure, allowing the company to retain their data, sequences, and workflows.

How We Choose These Agencies

Selecting the right Clay partner requires strict evaluation criteria to separate true technical experts from standard marketing firms:

• Official Partner Status: We prioritized agencies formally recognized by Clay as Elite Studio or Enterprise partners, validating their technical competency.
• Verifiable Outcomes: We looked for partners that publish named, verifiable case studies focused on qualified pipeline and closed-won revenue, rather than vanity metrics like “emails sent.”
• Infrastructure Ownership: The best agencies build workflows directly inside your HubSpot or Salesforce instance, ensuring you own the system after the engagement ends.
• Holistic GTM Approach: We favored partners who understand how outbound, inbound, content, and paid ads influence one another, rather than treating cold email in a vacuum.

Understanding the GTM Partner Landscape

Before evaluating specific partners, revenue leaders must understand the distinct categories of GTM support available in the market:

• AI SDR Software (e.g., Artisan, 11x): These are digital workers and technology platforms designed to automate top-of-funnel tasks like sourcing, researching, and drafting emails. While powerful, they are simply tools your internal team must configure, monitor, and strategize around.
• Single-Channel Outbound Agencies: These firms specialize in one specific activity, such as cold email or LinkedIn outreach. They typically run campaigns outside of your CRM, treating channels as isolated silos rather than parts of a unified revenue engine.
• Integrated GTM Agencies (e.g., Understory, Workflows.io, GrowthToday): These agencies take a holistic approach, blending multiple channels like paid media, outbound, and content to drive demand and pipeline.
• Operator-Led GTM Engineering: This is a comprehensive architectural approach. Teams build the underlying data systems connecting your CRM, enrichment tools, buying signals, ads, and outbound into one synchronized engine. Crucially, the infrastructure is built inside the client’s existing technology stack, allowing the company to retain full ownership of the systems.

Frequently Asked Questions (FAQs)

What is the exact difference between an AI SDR and a GTM engineering agency?

An AI SDR (such as Artisan or 11x) is a software platform that automates top-of-funnel tasks like sourcing accounts and drafting emails. In contrast, a GTM engineering agency is a team of experts that builds the strategic, architectural systems connecting your CRM, data enrichment providers, paid ads, and outbound tools together. They often utilize AI SDR platforms or infrastructure tools like Clay as just one component of a much larger, unified system.

Why has Clay become so critical for modern B2B outbound?

Clay serves as an orchestration and intelligence layer that aggregates data from dozens of different providers into a single, automated workspace. It allows revenue teams to score accounts, detect real-time buying signals, and enrich missing CRM data automatically before any outreach occurs. This ensures that outbound campaigns are hyper-targeted and highly relevant rather than generic and spammy.

Should a company build an outbound system in-house or hire a Clay agency?

If a revenue team possesses deep technical expertise in API connectors, waterfall data enrichment, and RevOps, they can build the infrastructure internally. However, engineering these systems often takes months of expensive trial and error. Hiring an expert partner accelerates your time-to-value, prevents critical mistakes that cause domain reputation damage, and ensures your data foundation is scalable from day one.

What happens when an engagement with a GTM engineering firm ends?

This outcome depends entirely on the partner’s service model. Traditional lead-generation agencies often take their data, workflows, and sequences with them, leaving the client with nothing but the meetings generated during the contract. True operator-led GTM firms build the infrastructure directly inside the client’s existing technology stack (like HubSpot or Salesforce), ensuring the company retains full ownership, access, and documentation of the systems even after the engagement concludes.

Conclusion

Scaling a qualified B2B pipeline requires significantly more than just high-volume emailing; it demands a sophisticated, signal-driven data foundation where outbound, content, and paid advertising work as one synchronized system. While standalone software tools and traditional single-channel agencies solve small pieces of the puzzle, sustainable revenue growth relies heavily on robust go-to-market engineering.

For post-product-market-fit companies looking to build a unified revenue engine they actually own, partnering with an Elite Studio expert like Frontal provides the technical execution and strategic alignment necessary to turn raw data into closed-won revenue.