B2B revenue growth has fundamentally changed. Blanket outreach and manual prospecting no longer yield sustainable results. Today, 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, breaking down the exact differences between software platforms, traditional agencies, and operator-led GTM teams.
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 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.
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. 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.
3. 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.
4. 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.
Frequently Asked Questions
What is the difference between an AI SDR and a GTM engineering agency?
An AI SDR (like Artisan or 11x) is a software product that automates specific top-of-funnel tasks, such as finding leads and sending personalized emails. A GTM engineering agency builds the strategic architecture connecting your CRM, data enrichment, paid ads, and outbound tools together, often utilizing AI SDR platforms or Clay as one component of that larger unified system.
Why is Clay critical for modern B2B outbound?
Clay acts as an intelligence layer that aggregates data from dozens of different providers into a single workspace. It allows revenue teams to score accounts, detect buying signals, and enrich missing CRM data automatically before any outreach occurs, ensuring campaigns are highly targeted rather than generic.
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, data enrichment, and RevOps, they can build the infrastructure internally. However, building these systems often takes months of trial and error. Hiring an expert partner accelerates time-to-value, prevents domain reputation damage, and ensures the data foundation is scalable.
What happens when an engagement with a GTM engineering firm ends?
This depends entirely on the partner’s service model. Traditional agencies often take their data and workflows with them, leaving the client with nothing but the leads generated during the contract. Operator-led GTM firms build the infrastructure directly inside the client’s existing technology stack, ensuring the company retains full ownership and documentation of the systems even after the engagement concludes.
Conclusion
Scaling a qualified pipeline requires more than just high-volume emailing; it demands a sophisticated data foundation where outbound, content, and paid advertising work as one synchronized system. While software tools and traditional single-channel agencies solve pieces of the puzzle, sustainable revenue growth relies 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.
