London-based Primer, a global payment facilitator, has raised $100 million in a Series C funding round as the company expands its AI-enabled payments and finance infrastructure platform.

In a statement on Tuesday, Primer said the round was led by Sofina, with participation from Southeast Asia-focused Peak XV Partners, and continued backing from existing investors including Balderton, Accel, ICONIQ, Tencent, and Speedinvest.

Following the funding round, Primer will expand investment in AI capabilities, including its proprietary AI agent, Primer Companion.

Primer is also increasing its focus on the United States,a lso its largest growth opportunity. The United States currently accounts for around one-fifth of Primer’s revenue, with annual recurring revenue in the region doubling year-on-year. The company plans to grow US revenue to more than one-third of its business by 2028 and expects to hire up to 50 employees in the region.

Founded in 2020, Primer can help address fragmentation in payment systems, where businesses often operate across multiple processors, acquirers, and fraud tools without a unified view of transaction data. Its platform now sits across a merchant’s full payments lifecycle, from checkout to payout, capturing more than 400 data points per transaction and managing over 95% of customer payment volume on average, according to Primer.

“In the next few years, every payment decision in a large business will be initiated, optimized or audited by AI,” said Gabriel Le Roux, CEO and co-founder of Primer.

Aakash Kapoor, Principal at Peak XV, said Primer’s infrastructure gives enterprises a consolidated view across processors, acquirers, fraud tools, and payment methods, which will become increasingly important as AI agents take on larger roles in payments operations.

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