Fragment, a New York startup building ledger systems designed for autonomous AI agents, has closed a $12 million Series A led by FirstMark Capital. BoxGroup also participated in the round, which was announced in October 2026 and brings the company's total raised to $23 million. Fragment declined to share its valuation.
The funding comes as major payment companies race to position themselves for a future where software agents conduct business on behalf of humans. Stripe unveiled an agentic commerce suite late last year; Visa and Mastercard have followed with their own agent-focused initiatives. But Fragment's founders argue those companies are solving the wrong problem.
Where payment processors handle the movement of money, Fragment provides the underlying accounting layer. The company's ledger enforces double-entry bookkeeping on every transaction, creating what CEO Thomas Neckel calls "guaranteed correctness" — a safeguard meant to prevent AI agents from making financially invalid moves that could wreck a company's books.
"Fragment is automating commerce," Neckel said in a statement. He describes the product as "a new super-material" for financial systems, though the company's pitch is more technical than philosophical.
The startup now serves roughly 50 to 60 paying customers, according to TokenPost. That roster includes Ramp and BILL, two corporate spend platforms that collectively manage billions in transactions, alongside newer players like Whop and AtoB. FirstMark partner Adam Nelson, who led the investment, said Fragment's engine has processed hundreds of millions of transactions, though the firm didn't provide an exact figure.
Neckel is a repeat founder. He sold identity-management startup Scuid to CA Technologies in 2014 and later started Cove.io, a private investing platform. His co-founder and CTO, Varun Mohan, previously worked at Robinhood. The pairing reflects Fragment's blend of infrastructure engineering and financial services experience.
The company raised $9 million in seed funding in mid-2024, drawing checks from Stripe, BoxGroup, and Avid Ventures. That round also attracted a notable collection of operator-investors: Uber's Dara Khosrowshahi, Plaid's Zach Perret, DoorDash's Gokul Rajaram, and Coinbase's Emilie Choi all participated. (Some sources reported the seed total as $11 million, which aligns with Fragment's disclosed $23 million cumulative raise.)
Fragment's most direct competitor is Modern Treasury, which also builds ledgering and financial operations infrastructure. But Neckel frames Fragment's approach as fundamentally different. Rather than building agent features atop existing payment rails, Fragment started with a ledger designed for programmatic access. The company released an MCP server earlier this year and published an October manifesto titled "Money_v2" that lays out its vision for agent-operated finance.
Whether that vision materializes remains uncertain. AI agents still struggle with reliability in complex domains, and corporate finance is hardly forgiving of mistakes. Fragment's bet is that strong technical guardrails will matter more than speed.
The company says it's "building the financial system of the future," as Neckel put it. That's a grand claim. For now, it has a $12 million runway and a growing list of customers willing to test the premise. Fragment is hiring across go-to-market and engineering roles.
