A Bank for International Settlements (BIS) working paper published on Sept. 15, 2026, reveals that expanding Tether (USDT) supply on Ethereum failed to generate a sustained increase in smart-contract holdings, challenging the assumption that stablecoin growth directly equals DeFi adoption. Meanwhile, smart-contract accounts on the Tron network held approximately 1% of its USDT across most of the study's historical timeframe.
Key Takeaways
- Ethereum smart-contract accounts held 10% to 15% of network USDT in late 2024, down from over 20% in 2021 and 2022.
- Tron smart-contract accounts consistently held 1% or less of the chain's USDT, amounting to $1 billion or less compared to Ethereum's $10 billion to $15 billion.
- A DefiLlama snapshot on Sept. 28 showed $183.7 billion in total USDT market cap, with $73.3 billion on Ethereum and $92.5 billion on Tron.
Dissecting Balance Distributions Across Chains
To conduct the analysis, BIS researchers reconstructed USDT holdings using transfer event logs, categorizing addresses into smart contracts and externally owned accounts (EOAs) while cross-referencing mint, burn, and blacklist-destruction events. The study notes that on Ethereum, the share of USDT in smart contracts hovered around 15% to 20% until late 2024 before settling between 10% to 15% as total issuance expanded. Researchers emphasized that a falling percentage does not signify capital flight from decentralized finance, as newly issued tokens simply accumulated faster in non-contract addresses.
By contrast, Tron's smart-contract holdings remained a tiny slice of its total supply, holding roughly $1 billion or less according to Figure 10 of the paper. The study highlights how traditional metrics like total value locked (TVL) measure venue-specific deposits that may double-count tokens, whereas tracking individual token balances across address types provides a clearer view of distribution. This analytical distinction comes as broader institutional interest in stablecoins expands, echoing themes found in a Visa study on stablecoin adoption.
Evaluating Modern Stablecoin Dashboards
The BIS paper's historical chart stops prior to 2026, meaning its relative percentage breakdowns cannot be interpreted as active September 2026 metrics. Current third-party dashboards reflect massive ongoing expansion; for example, a Sept. 28 snapshot from DefiLlama logged $183.7 billion in total USDT market cap across all blockchains. Of this aggregate, Ethereum accounted for $73.3 billion and Tron represented $92.5 billion.
However, current token totals alone do not clarify whether assets reside in decentralized trading venues, exchange wallets, or payment rails. Furthermore, smart contract holdings can represent bridges, wrappers, or custodial services rather than active liquidity protocols, such as those seeing deployment in stock-token loan pools on Base.
Why It Matters
This research demonstrates that raw stablecoin market cap expansion is a misleading proxy for decentralized finance growth. As institutions and retail users increasingly leverage stablecoins for payments, settlements, and exchange custody, market participants must distinguish between token issuance and actual protocol liquidity. Tracking specific account classifications rather than aggregate market cap will be essential for accurately evaluating decentralized network utility moving forward.
