Primer raises $100M to AI-enable payments

Primer, a London-based payments infrastructure startup founded in 2020, announced a $100 million Series C funding round led by Sofina, with participation from Peak XV Partners and continued backing from existing investors including Balderton, Accel, ICONIQ, Tencent and Speedinvest, per the company press release published via Business Wire and reporting by Sifted and Dealroom. Dealroom reports the round was oversubscribed and brings Primer's total funding to $170 million. The press release and Sifted state the funds will be directed toward accelerating Primer's AI capabilities and expanding in the United States, with a stated target to grow US revenue to more than a third of total revenue by 2028 and to hire up to 50 roles there.

Per the company's release, Primer provides a unified payments operating layer that sits across a merchant's payments lifecycle, capturing over 400 data points per transaction and managing more than 95% of customer payment volume on average. The platform processes billions of transactions annually for customers such as GetYourGuide, Dialpad and Printful, and integrates multiple providers including Stripe, WorldPay, Klarna and GoCardless, according to Sifted and the press materials. Primer launched an AI agent in November 2025 called Primer Companion; the company describes plans to expand the agent's capabilities so it can operate autonomously within merchant-set parameters, per Sifted and the press release.

Industry-pattern observations: Payments orchestration layers that centralise fragmented transaction data are a common prerequisite for reliable machine-driven decisions. Companies in this segment emphasise data completeness, the press release frames Primer Companion as relying on the platform's consolidated data to avoid agent errors arising from fragmented inputs. For practitioners, that pattern means investments in ingestion, schema normalisation and real-time telemetry are typically prioritized before deploying autonomous decisioning agents at scale.

A $100 million Series C for a payments infrastructure provider signals investor conviction in composable payment stacks and in applying AI to operational workflows such as routing, reconciliation and fraud response. Reporting across Business Wire, Sifted and Dealroom places Primer among a wave of fintech vendors packaging orchestration plus AI tooling for enterprise merchants. For engineering teams, the notable elements are the scale claims (billions of transactions, 400+ data points per event) and the intention to enable agent-driven actions within merchant-set guardrails, which raises operational, observability and auditability requirements.

Observables for the market include whether Primer Companion begins executing live, automated routing or retry logic on behalf of merchants and the fidelity of its audit logs. Reported hiring plans and the stated US revenue target to exceed a third of total revenue by 2028 are measurable growth signals to track via hiring announcements and revenue disclosures. Also monitor integration breadth with key PSPs and acquirers, and any third-party audits or case studies that validate autonomous-agent performance on production payment flows.