Case Study

Peakflow, a full-service B2B lead generation agency based in Croatia, spent a long time testing email data providers before settling on their current stack. Findymail sits at the top of that waterfall - delivering around 87% coverage at a fraction of the price of comparable tools, while keeping bounce rates consistently below 2%. For an agency working with clients who have small, targeted markets, coverage and accuracy aren't just technical metrics. They're the difference between a campaign that works and one that doesn't.

Meet Peakflow

Peakflow is a full-service B2B lead generation agency based in Croatia, founded by Antonio Cerneli. What sets them apart from most outreach agencies is their approach: rather than running cold email as a standalone service, they combine sales and marketing into a single funnel - cold outreach, content marketing, paid advertising, and signal-based lead generation all working together.

The agency works with B2B clients across a range of industries and has booked meetings with organizations including National Geographic, UNICEF, Erste Bank, and Roche. Many of their clients operate in smaller, niche markets - which makes data coverage particularly critical to their work.

The challenge

Peakflow's challenge wasn't a single broken process - it was the complexity of managing too many tools without enough return. Antonio had put a lot of different email data providers to the test before settling on his current setup. Some were too expensive for the coverage they provided. Others had good coverage but lacked the API integrations needed to plug cleanly into Clay-based workflows. Many were simply inconsistent.

For an agency running campaigns on behalf of clients with small, targeted markets, this created a real problem. When a client only has 10,000 potential contacts in their entire addressable market, the difference between finding 5,000 emails and 8,000 emails isn't a small rounding error - it determines whether a campaign can actually scale.

The cost of splitting across providers

One of the less obvious issues was pricing. When volume is spread across many providers, none of them give you good rates. Each provider charges more because your usage with them individually is low. On top of that, building and maintaining a waterfall of 30 different providers in Clay adds columns, complexity, and makes it much harder to delegate work to team members without things breaking.

"If we are running 30 different providers, it just complicates things. Each provider will give us the worst possible pricing because we don't have high volume. We have to add 60 different columns inside Clay which presents limits on its own." - Antonio Cerneli, founder of Peakflow

The solution

After running a structured test across providers, Antonio made Findymail the first stop in Peakflow's waterfall enrichment workflow - built in Clay. The decision came down to one core metric: coverage-to-price ratio.

Findymail came in at around 87% coverage in their tests. Some providers with waterfall enrichment built in reached slightly higher - but at roughly four times the price. For Peakflow, concentrating the majority of their volume with a single high-quality provider meant better pricing, a simpler stack, and easier workflows to maintain and delegate.

"It wasn't the cheapest price, but it was among the best coverage we had. And compared to providers that were kind of equal on coverage, Findymail is just four times cheaper." - Antonio Cerneli

How the waterfall works

Every campaign goes through the same enrichment process before launch. Findymail runs first and finds the majority of emails - roughly 90% of all emails Peakflow uses come from this step. Each batch is then validated before moving on. If Findymail doesn't find a match, the workflow moves to a secondary provider, validated again, and then a third. The result is a clean, predictable enrichment pipeline that the whole team can run without needing to understand every layer of it.

"Our first step is Findymail. We find the majority of emails with Findymail, and then we include the next provider to find the rest - maybe 10%. So around 90% of our emails are coming from Findymail." - Antonio Cerneli

By the numbers

Under 2% bounce rate, consistently: Peakflow's campaigns run with bounce rates below 2%. Their sending setup has a campaign pause trigger if bounce rate crosses a set threshold - and Antonio says he can't remember the last time it actually fired. That's a direct reflection of the data quality coming out of their enrichment workflow.

Simpler workflows, easier to delegate: consolidating the majority of their email sourcing into one primary provider simplified Peakflow's Clay workflows significantly. Fewer columns, fewer provider accounts to manage, and a process that's straightforward enough for team members to run without needing to rebuild it from scratch each time.

"It's also simple to delegate this kind of workflow to our team members because they don't have to build a waterfall of 30 different providers. They can just add one and that's it." - Antonio Cerneli

Coverage that matters for niche markets: for Peakflow's clients with smaller addressable markets, Findymail's coverage rate has a direct impact on campaign performance. Getting close to 90% of a contact list enriched - rather than 50-60% - means more contacts reached, more meetings booked, and better results for clients.

"The difference between having 5,000 contacts and 8,000 contacts is huge, especially for us because we are converting much more meetings per thousand contacts than a standard cold email agency." - Antonio Cerneli

Why Antonio recommends Findymail

"Findymail is premium coverage for standard pricing."

- Antonio Cerneli, founder of Peakflow