The Q3 2026 ledger indicates a structural variance in bank funding models. As stablecoin market capitalisation holds near $304 billion, the composition of bank liabilities is undergoing a recorded shift. The Bank for International Settlements (BIS) issued a warning on August 28: the expansion of bank-issued digital money could make borrowing more expensive. This is not a prediction. It is a direct consequence of the asset-liability mechanics being assembled on-chain and off-chain. The question is not whether banks will issue stablecoins. The question is what they are issuing, and what that issuance does to the cost of credit.
Context: The Two-Tier Ledger
The stablecoin market now records approximately $304 billion in total value, with Tether commanding $183 billion and USDC at $74 billion. Federal Reserve researchers classify these tokens as potential competitors to traditional transaction accounts. In response, a Federal Reserve survey from September 2025 indicates that roughly half of respondents plan to prioritise growth in at least one stablecoin or digital-asset area over the next three years.
Banks are not entering this space uniformly. The technology is identical; the liabilities are not. J.P. Morgan’s JPM Coin represents a bank deposit on a blockchain. Société Générale-FORGE’s CoinVertible is a MiCA-regulated stablecoin backed by segregated collateral. Both use distributed ledger technology. Both promise efficiency. One is a deposit. The other is not. This distinction is not semantic. It determines capital treatment, insurance status, and settlement properties.
Nitin Gaur, Head of Institutions at Nethermind, frames the issue precisely: “The interesting question stopped being whether a bank can issue and became what a bank is issuing. A tokenized deposit and a bank-issued stablecoin are two different liabilities with different legal character, different capital treatment, different insurance status and different settlement properties.”
Arthur Firstov, Chief Business Officer at Mercuryo, adds a market-level observation: “Stablecoins stopped being a crypto product and became a payments product. For years banks could wave it off as ‘crypto infrastructure’ – that’s a much harder line to hold when stablecoins are being used for payments, treasury, cross-border settlement, cards, merchant payouts, and institutional settlement. At that point they’re competing directly with one of the most valuable products a bank has: the transaction account.”
Core: The Balance Sheet Mechanics
To understand the cost of credit, one must follow the outflows. A tokenized deposit remains bank funding. It sits on the liability side. It is insured, subject to reserve requirements, and available for lending. A bank-issued stablecoin, under the US GENIUS Act, is different. It requires one-to-one backing with eligible reserves—cash or short-dated Treasuries. The Treasury proposed implementation rules on August 17, 2026. The issuer cannot lend against those reserves.
Gaur describes the effect on the bank’s balance sheet: “A stablecoin issued under a GENIUS pathway is not a deposit. It is a payment instrument backed by segregated reserves the issuer cannot lend against. When a treasurer moves a hundred million from a demand deposit into the bank’s own coin, the bank has converted a funding source into a matched, non-lendable reserve pool.”
This is the core transaction. A transfer of $100 million from a demand deposit into a bank-issued stablecoin removes that $100 million from the lendable pool. In return, the bank receives an asset—the reserves backing the stablecoin—but that asset is encumbered. It cannot be used for fractional-reserve lending. The bank’s funding base shrinks.
The outcome depends on where the reserves ultimately reside. If the reserves are deposited back at the issuing bank, they can still appear on the balance sheet as deposits. But they are more concentrated, more rate-sensitive, and quicker to leave. Adrian Wall, Managing Director of the Digital Sovereignty Alliance, identifies the systemic risk: “If stablecoin adoption ultimately shifts funding away from bank deposits rather than recycling those funds back into the banking system, banks could face higher funding costs and potentially less capacity to extend credit.”
The Comparative Metric: JPM Coin vs. CoinVertible
Tracing the source of activity requires a distinction between transaction volume and circulating supply. J.P. Morgan reports approximately $7 billion in daily activity across its Kinexys products, which include JPM Coin. Société Générale-FORGE reports €156.6 million in euro tokens and $12.55 million in dollar tokens outstanding as of August 31. These are not comparable metrics. One measures flow; the other measures stock. Neither establishes which model is winning. The data reveals a different pattern: banks are choosing different liability structures for different use cases.
The Real-World Test: Citi and Western Union
In July, Citi reported a dollar payment from London to Thailand executed over a US holiday weekend, using its tokenized-deposit service alongside 24/7 clearing. This is a concrete test of the value proposition. Traditional correspondent banking would have required settlement during US business hours. The tokenized deposit enabled settlement on a Sunday. Western Union launched USDPT in May, with Anchorage Digital Bank issuing the stablecoin on Solana. These are not theoretical use cases. They are live payment rails.
Contrarian: Correlation Is Not Causation
A common interpretation is that stablecoin issuance simply replaces one form of bank funding with another. This is not supported by the data. Under the GENIUS Act, a stablecoin is not a deposit. It is a payment instrument. The reserves backing it are segregated. The bank cannot lend them. When a customer moves funds from a demand deposit into a stablecoin, the bank loses a lendable liability. When that stablecoin is spent, the reserves may move to a different bank entirely. This is not a neutral substitution. It is a structural change in the composition of bank liabilities.
Another blind spot is interoperability. As more banks issue their own tokens, separate coins could fragment liquidity. Users may need to exchange one bank’s token for another to transact across relationships. The technology connects blockchains; it does not guarantee conversion at face value during market stress. The assumption that a tokenised deposit and a stablecoin are interchangeable for liquidity purposes remains unverified.
Takeaway: The Next Signal
The next signal to watch is the composition of bank funding costs over the next two quarters. If banks pass on the increased cost of funding to borrowers, loan rates will rise. The first indicator will be the differential between deposit rates and the yield on bank-issued stablecoin reserves. The second will be the volume of stablecoin conversions per bank. The third will be the interbank market for stablecoin conversion rates. Audit complete. The ledger does not close until the funding question is answered.