Diameter Pay has raised a $10 million Series A to expand its infrastructure for global U.S. dollar payments, virtual accounts and stablecoin connectivity. The financing was co-led by CMT Digital and Lightspeed Faction, with participation from SixThirty Ventures, Stellar Development Foundation, Tech Council Ventures, Onigiri Capital and BitRock Capital.
Diameter Pay provides banks, fintechs and digital asset exchanges with access to U.S. dollar accounts and payment rails through a single API.
The platform supports virtual accounts, domestic and international payments, stablecoin on- and off-ramps and embedded compliance capabilities across multiple banking partners.
Diameter Pay has processed more than $10 billion in payments year-to-date in 2026.
The funding will be used to expand banking and payment capabilities, deepen the company’s stablecoin and foreign exchange infrastructure and continue investing in compliance technology.
KEY QUOTES:
“The world is becoming more global, but the financial system is becoming more fragmented. Diameter Pay takes a different approach: rather than asking banks to accept more risk, we provide the technology, data, and compliance infrastructure to understand and manage that risk with greater precision. That’s the bridge we’re building, between traditional finance and digital finance, so money can move at the speed people and businesses actually need in a world that now runs 24/7.”
David Lighton, Founder and CEO of Diameter Pay
“Stablecoins are transforming how dollars move globally, but they don’t replace the need for trusted access to the U.S. banking system. Diameter provides that connective layer, combining traditional payment rails, stablecoin infrastructure, and compliance in a platform built for regulated financial institutions.”
Charlie Sandor, Partner at CMT Digital
“The challenging part of modernizing global payments with stablecoins isn’t just technology. It’s building reliable and trustworthy compliance and banking infrastructure. Diameter started with a relentless focus here, and has won the trust of a growing number of clients as a result. We’re thrilled to be backing the company for its next leg of growth.”
Tim Khoury, Partner at Lightspeed Faction
“The modern payments stack is no longer just about speed-to-market; it’s about speed-to-trust. The components: verified counterparties, transactions screened before they move, and licensed settlement behind them. Diameter is the settlement layer that ties each of those critical parts together, turning a trusted counterparty and a clean transaction into dollars that actually arrive, compliantly, across borders. It reflects a conviction we hold about this market: trust, not transport, is the product in modern money movement. Diameter delivers it.”
Evan Thorpe, Principal at SixThirty Ventures
