List building/prospecting and data cleaning is free on Clay. Integrations with CRMs or email sending tools are also free on our Pro plan.
We charge credits for data enrichment, because we have to pay data providers to access lead or account research. That includes things like fundraising data, LinkedIn profiles, contact information, AI web scraping, etc.
If you have existing subscriptions to any data enrichment tools, however, you can use them free of cost in Clay by connecting your own API keys.