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Fiserv Inc. has launched INDX, a real-time cash-settlement platform that enables digital-asset companies to store and transfer U.S. dollars at all hours and every day in real time. Digital-asset companies can use INDX to move dollars into a single custodial account insured up to $25 million by the Federal Deposit Insurance Corp.
FDIC insurance is available through StoneCastle Cash Management, which specializes in insured-deposit solutions and cash management. Fiserv acquired the company in 2025 for an undisclosed sum.
Fiserv says it created INDX because there are few platforms that allow financial institutions to settle their digital-asset transactions in U.S. dollars, which they prefer to do. “We built INDX to remove these trade-offs – offering the speed of real-time 24/7 transfers at scale with the safety of up to $25 million of federal deposit insurance,” a Fiserv spokesperson says by email.
Digital-asset companies can use INDX to move fiat currency instantly without having to record the transaction on a blockchain ledger and without the constraints of traditional banking hours. Each transfer is final and immediately available in U.S. dollars.
For financial institutions in the Fiserv Deposit Network, INDX provides another source of deposits. Dollars will be moved across the Fiserv Deposit Network, which serves more than 1,100 insured financial institutions in the United States. “Diversified deposit sources like those managed by INDX create a new pipeline of cost-efficient, stable, and granular deposits that smaller financial institutions would not otherwise have access to obtain,” the Fiserv spokesperson says.
The launch of INDX also carries out Fiserv’s “strategic vision” behind its 2025 acquisition of StoneCastle, which boosted Fiserv’s capabilities in FDIC-insured deposit solutions, liquidity management, and digital asset services, specifically its FIUSD stablecoin, which launched in 2025.
“Growth in digital assets is being powered by institutional adoption and the maturity of the ecosystem,” the Fiserv spokesperson says. “[Financial] institutions are deploying and expanding their digital assets use cases rapidly. INDX powers these use cases on the fiat USD layer, allowing for seamless, real-time interoperability between these digital-asset opportunities and an institution’s cash operations.”
