For a minute, it looked like “any company can be a bank” was going to be the default setting. Then came frozen accounts, missing money, consent orders, and court dockets.
Exhibit A: Solid Files Chapter 11
In April 2025, Solid Financial Technologies filed for Chapter 11 in Delaware. CEO and co-founder Arjun Thyagarajan cited costly litigation and an inability to raise capital since 2022 as the breaking points.
The filing shows roughly $760,000 in unsecured trade debt, ~$7 million in cash (about $2 million held in non-liquid reserve accounts), and a plan to sell core assets (its API) while cutting legal spend and crafting a reorganization plan after a sale process.
Solid says it intends to continue operations during the restructuring. It also pursued Subchapter V for faster timelines and fewer fees – an explicit nod to how tight the runway has become.
Exhibit B: Synapse Collapses (And Confidence With It)
A year earlier, Synapse filed for Chapter 11 (Apr 2024). In the fallout, customers faced frozen accounts, with regulators and partners citing ledger inconsistencies and reconciliation failures – including FBO accounts that didn’t match up.
Reports highlighted $85 million in missing customer funds over a period, and four partner banks lost contact with Synapse’s financial records, leaving $265 million in deposits blocked.
The human cost was real: tens of thousands of users locked out of savings for weeks.
When the Middleman Fails, Sponsor Banks Bleed
Synapse’s unraveling ricocheted through its network.
Evolve Bank & Trust, a key partner, landed under public scrutiny and subsequent enforcement action, while Mercury ultimately ended its relationship with Evolve and migrated customers to other banks.
The issues spilled into Washington: Sen. Elizabeth Warren pressed the Fed’s supervisory nominee about the “blow-up” around Evolve and Synapse. That debate over charters and accountability echoes earlier fights, such as the FDIC denying Coinbase’s charter bid and ongoing disputes around crypto firms seeking bank charters.
The Crackdown Arrives: The “Synapse Rule” Moment
Regulators answered with a reset.
Post-collapse, a BaaS reckoning took shape: supervisors re-asserted that sponsor banks are fully accountable for compliance and consumer protection in fintech partnerships.
The FDIC’s new recordkeeping expectations – shorthand in the market as the “Synapse Rule” – aim to ensure banks can trace end-user funds quickly, even when a middleware provider fails.It’s a shift from growth-at-all-costs to control-first, not unlike the broader trend of banks embracing digital assets cautiously after years of resistance.
Why Aggregators Are in the Crosshairs
Solid’s own court papers spell out the squeeze: regulatory shifts after crypto-market turmoil made parts of the BaaS aggregator model “unsustainable,” litigation drained the balance sheet, and the firm struggled to retain clients and key employees.
Partner banks tightened standards, too.
Lewis & Clark Bank required a $10 million security reserve and extra reporting before later terminating the master services agreement; Solid’s four active clients there were scheduled to wind down by May 31.
The company also moved to shut down Solid India on that same timeline.
Industry veterans see the same pattern: as Bob Hartheimer (Klaros Group) put it, the bar has been raised, not only for sponsor banks, but for aggregators, compliance, and risk providers serving the bank–fintech ecosystem.
Inside the Numbers: A Model Under Strain
Solid’s snapshot reads like a case study in pressure: no new client contracts in 2025, the largest client departures in late 2023/early 2024, and a headcount that fell from 23 employees (2023) to three plus one contractor at filing.
It had worked with 142 clients since its founding and cycled through multiple sponsor banks (BBVA, Evolve, Citizens Bank of Weir for card issuance, and Lewis & Clark).
Meanwhile, Synapse had touched 10+ million retail users and nearly 100 businesses before its collapse, proof that BaaS reached real scale before its weak joints were exposed.
What Sponsor Banks Are Doing Next
The message from supervisors is uncomplicated: own the ledger, own the risk.
That means tighter recordkeeping at the bank, deeper third-party oversight, and less reliance on an intermediary’s internal systems to prove where customer money is, minute by minute.
For partner selections, that translates into measured onboarding, stronger SLAs, and explicit incident playbooks, because when a middleware provider stumbles, the reputational and regulatory blowback lands on the bank’s doorstep first.
What Fintechs Need to Hear
If your model depends on continuous data pulls and sponsored accounts behind the scenes, assume more audits, more reserve asks, and stricter reporting.
Expect banks to prioritize reconciliation fidelity and funds traceability above feature velocity.
And if you’re functioning as an aggregator, plan for higher capital intensity, clearer segregation of duties, and verifiable books and records that can stand up when the lights go out.
The Lesson, Not the Headline
BaaS didn’t die. It matured fast.
After Synapse and Solid, the question isn’t “Can a sponsor bank support embedded finance?”
It’s “Can it do so with the same level of control and record integrity regulators demand everywhere else?”
The players who answer yes will keep building. The ones who can’t will keep showing up in filings and footnotes.
