V-Sum Fifteen

Crescent profile

Grant Roscoe

Crescent demos a high-yield treasury product for businesses — live in production V1, newly serving its first publicly traded customer, backed by USDC over-collateralized lending desks with zero exposure to Terra/Luna or Celsius and $30B of originations through its partners. The dashboard compounds interest every second, breaks earnings down by lifetime/year/month, and exposes admin controls for teams (plus easy switching between accredited individual and multiple business accounts, appealing to investment advisors). Because Crescent bridges fiat to USDC to lending desks, it natively supports wire and USDC deposits (ACH via Plaid coming soon) — the demo wires USDC from MetaMask into a Crescent account. Yield is accrued fungibly 1:1 in USDC/dollars at a ~4% sustainable rate. Despite looking like fixed income, Crescent accounts are fully liquid: next-day withdrawals initiate a wire, with Crescent pulling from fully-liquid lending pools, converting USDC to cash, and using bank credit lines to guarantee next-day settlement at zero fees. The roadmap is a yield marketplace: traditional cash sweeps, Treasury/mutual-fund products, and crypto yields — Crescent as the composable middle layer between businesses and yield sources.

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Modern Treasury profile

Koji Murase

Koji, PM at Modern Treasury, walks through Modern Treasury Ledgers — a managed double-entry ledger API for fintechs like Revolut and Marqeta, marketplaces like ClassPass and Outdoorsy, and anyone building money-movement apps. The demo builds out "BillFold," a sample digital wallet, and walks through the patterns Modern Treasury has seen in production: custom ISO currencies (including USDC with a six-digit exponent for stablecoin-native apps), pending-vs-posted states for in-flight payments, immutable pending transactions with full audit trails, combined payment-plus-ledger API calls, and optimistic locking for just-in-time card funding flows alongside card issuers like Lithic and Marqeta. The closing pattern — purely in-ledger transactions between user accounts — makes user-to-user transfers essentially instant without ever touching an external rail.

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FinGoal profile

Jack Ryan

Jack Ryan of FinGoal demos the FinGoal Switch Kit — a wrapper around Plaid, MX Link Money, Yodlee, and other aggregators that normalizes the account and transaction shape so you can swap aggregators in minutes instead of months. The live demo starts with a Next.js app running a Plaid link against Wells Fargo, then swaps the token endpoint and frontend portal to MX Link Money — which authenticates via open banking directly in the Wells Fargo app. The migration philosophy is not a big-bang swap: FinGoal recommends leaving existing Plaid connections alone and re-linking users through the new aggregator only when a connection breaks, so net-new users and natural re-auths silently migrate without churn. The Switch Kit\'s payoff is that the success page digests the callback event string from Link Money and renders the new accounts and /transactions/get output alongside pre-existing Plaid data — same schema, same categories, same fields — with only three files changed across the entire app. The thesis: developers should not be locked into an aggregator by migration cost.

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