Cleanlist has been a strong layer in our B2B lead sourcing stack.

You only pay for emails found, so failed lookups don’t waste credits. The data is often fresher than bigger tools, especially for companies with recent rebrands. The API is simple to integrate, and it helped recover usable contacts from lists other sources missed.

Worth noting: verify emails before sending, and people discovery works better in the portal than via API. As an enrichment layer, recommended.