Diameter Pay raises $10 million to expand stablecoin payment infrastructure
Diameter Pay, a startup building payment infrastructure for stablecoins and U.S. dollar access, has raised $10 million in a Series A funding round. The round was co-led by CMT Digital and Lightspeed Faction, with participation from other investors including SixThirty Ventures and the Stellar Development Foundation.
The company, founded in 2023, helps banks, fintechs, and digital asset exchanges access U.S. dollar accounts, payment networks, and stablecoin services. Stablecoins are digital tokens pegged to traditional currencies like the U.S. dollar, designed to maintain a stable value.
Funding and growth plans
This is Diameter Pay’s first funding round after operating as a bootstrapped company. The round closed in July 2026 as a single equity tranche. The startup plans to use the funds to expand its banking and payment capabilities, improve its stablecoin and foreign exchange infrastructure, and invest in compliance tools for cross-border dollar transactions.
Diameter Pay reports it has processed over $10 billion in payment volume so far this year. Its clients include large fintech firms and banks in financial hubs such as Switzerland and Singapore. The company is registered as a money services business and holds a money transmitter license in New Jersey.
How the platform works
Diameter Pay provides virtual U.S. dollar accounts for foreign fintechs, allowing them to offer dollar-based services to their customers. The platform handles compliance and payment controls, and it connects to stablecoin infrastructure for seamless on- and off-ramps. Sponsor banks, including Portage Bank and SSB Bank, enable access to U.S. dollar clearing systems in exchange for fee revenue and deposits.
The company currently has a team of 20 people across the U.S., Argentina, Poland, and Nigeria. It is hiring for key roles, including a chief technology officer and a chief commercial officer.
Investor and advisory details
As part of the Series A round, CMT Digital secured a board seat, while Lightspeed Faction and SixThirty Ventures took observer roles. Robert Pozen, former president of Fidelity Investments, serves as a senior advisor to the board.
