Yes, you can purchase credits on a one-time basis as "credit top-ups" on paid plans. To purchase additional credits, go to the upper-right corner of Clay, click your name, then navigate to Settings > "Plan & billing" and click "Purchase credits".
Note that credit top-ups cost 50% more than your plan's typical cost per credit, and this feature is only available on paid plans - not the free version.
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Inquiry About One-Time Purchase of 10,000 Credits for Enrichment | Clay