· Venture Capital Tracker · investment-strategies · 3 min read
Diameter Pay’s $10M Series A: Dollar Rails + Stablecoin Ramps for Banks
Bootstrapped Diameter Pay raised $10M co-led by CMT Digital and Lightspeed Faction after claiming >$10B YTD payment volume — selling compliant USD access, not a consumer remittance app.
VCT data record
Funding event facts
Source-backed financing and transaction details. Unknown terms remain undisclosed rather than estimated.
Diameter Pay raises $10M Series A
Jersey City fintech Diameter Pay announced a $10M Series A co-led by CMT Digital and Lightspeed Faction for USD rails, virtual accounts, and stablecoin on/off-ramps for institutions.
- Event type
- Funding Round
- Event date
- Sep 3, 2026
- Stage / label
- Series A
- Amount
- $10M
- Confidence
- Company Disclosed
Company / target: Diameter Pay
Lead: CMT Digital , Lightspeed Faction
Participants: SixThirty Ventures , Stellar Development Foundation
Sources: prnewswire.com theblock.co
Diameter Pay announced a $10 million Series A on September 3, 2026, co-led by CMT Digital and Lightspeed Faction (company PR; The Block). Valuation was not disclosed. CEO David Lighton told The Block the equity closed in July after a process that started in April — and that this was the company’s first outside round after bootstrapping.
Spine: correspondent banks pulled back from entire corridors; stablecoins move dollar value 24/7 — but institutions still need regulated, screened connectivity into U.S. accounts. Diameter sells that bridge as an API, not a consumer wallet.
Key facts
| Field | Detail |
|---|---|
| Company | Diameter Pay (ex-SendFriend) |
| Round | $10M Series A (equity; single tranche) |
| Co-leads | CMT Digital, Lightspeed Faction |
| Also in | SixThirty, Stellar Development Foundation, Tech Council Ventures, Onigiri, BitRock |
| Traction (company) | >$10B YTD 2026 volume; >10,000 end users |
| Governance | CMT board seat; Lightspeed Faction + SixThirty observers; Robert Pozen senior advisor |
Who uses the product — and for what job
Users: banks, fintechs, and digital-asset exchanges that need U.S. dollar virtual accounts, domestic/international rails, stablecoin on/off-ramps, and embedded compliance — Lighton pointed to clients from Switzerland to Singapore without naming logos.
Job: one API that combines account access + payment rails + stablecoin settlement + screening so regulated institutions can extend dollar services without rebuilding correspondent relationships corridor by corridor.
Why now
- Stablecoin settlement volume rose while traditional correspondent coverage shrank under AML/sanctions pressure.
- Crypto-native remittance apps are the wrong buyer; licensed institutions need the compliance stack first.
- A bootstrapped firm claiming $10B YTD volume before a first institutional round is the anomaly — if the figure holds under diligence.
Why CMT Digital and Lightspeed Faction
CMT Digital is a crypto/fintech specialist writing the board seat; Lightspeed Faction is Lightspeed’s digital-assets vehicle (not our Lightspeed NYC directory page — do not conflate). SixThirty adds fintech-risk context. The cap table reads as trust and licensing capital, not growth SaaS tourists.
CMT Digital, Lightspeed Faction, SixThirty, and Stellar DF have no /fund/ pages here.
Competitive map
| Approach | Tradeoff |
|---|---|
| Classic correspondent banking | Trusted; slow, corridor-fragile |
| Consumer remittance / neobank USD | Fast UX; thin institutional compliance story |
| Pure stablecoin issuers / on-ramps | Crypto-native; still need bank connectivity |
| Diameter institutional API | Compliance-first; volume claim unverified externally |
What is not proven
- Valuation, take rate, and revenue.
- Share of volume that is stablecoin vs fiat rails.
- Named bank logos and concentration risk.
- Independence of the $10B figure beyond company disclosure.
Practical takeaway
- Founders (payments infra): Lead with risk tooling for banks, not “stablecoins are the future.”
- Investors: Diligence volume quality, partner banks, and AML false-positive rates before treating $10B as ARR proxy.
- Operators: Relevant if you need USD accounts + stablecoin settlement under one compliance umbrella.
Sources
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Editorial note: AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.
