AI billing startup Paid has raised $21.6 million in a seed funding round led by Lightspeed, elevating its total funding to $33.3 million and its valuation to over $100 million. Founded by Manny Medina, the London-based company offers a unique billing platform that allows AI agent developers to charge clients based on performance metrics rather than traditional per-user pricing. This approach addresses a significant industry challenge, as 95% of AI projects struggle to demonstrate value. Paid's 'pay-for-results' platform enables providers to convert efficiency gains into revenue, with early adopters including Artisan and IFS. Alexander Schmitt from Lightspeed highlighted the firm's $2.5 billion investment in AI infrastructure and praised Paid's innovative value-tracking method for effectively quantifying agent contributions.