How $7 Billion Moved On‑Chain: Inside Tokenized MMFs and Their Smart‑Contract Infrastructure
🧭 A flagship case of on‑chain finance: How do tokenized MMFs actually work?
※ This is a preliminary version and will be updated to the final Daily Crypto Times (DCT) format in two days.
※ This article builds on the previous piece, “Tokenized Treasuries, MMFs, and Deposit Tokens: The Three Core Pillars of Institutional On‑Chain Finance” . If you haven’t read it yet, we recommend starting there for broader context.
The idea that blockchain technology is transforming finance is no longer an exaggeration. Just looking at the past few years makes the speed of change very clear.
- 2021: First tokenized fund launches
- 2024: BlackRock enters the space
- 2025: JPMorgan follows
- 2026: A $7B money‑market fund is deployed on Ethereum as an ERC‑20 token
Today, 71.9% of tokenized funds run on Ethereum, and the RWA (real‑world asset) tokenization market is around $30B and growing daily. At the center of this shift sits the tokenized money‑market fund (MMF).
So how do investors actually use tokenized MMFs, how is yield paid out, and how do the underlying smart contracts work? Let’s walk through it step by step.
1) How do investors use tokenized MMFs, and how do they earn yield?
A tokenized MMF is a traditional money‑market fund represented as a token on a blockchain. Investors buy this token via a wallet, and the token represents a claim on the fund.
✔ How investors use it
- Create a wallet
- Buy the tokenized MMF
- Hold and use it (24/7 trading, use as collateral in DeFi)
- Redeem (sell): return the token to the redemption contract → receive cash/stablecoins
✔ How yield is paid
- NAV appreciation model
- Automatic on‑chain distribution
- Rebasing model
Simply holding the token in a wallet is enough for the investor’s yield to accrue over time.
2) When are the smart contracts for tokenized MMFs deployed?
A common question is: “If redemption means returning tokens to a smart contract, when was that contract actually created?”
The answer is straightforward: The smart contracts are deployed before the tokenized MMF launches.
✔ Why they must exist before launch
- Tokens must be minted when investors buy
- Tokens must be burned when investors redeem
- Institutional investors need to review and audit the code in advance
- Regulatory filings (e.g., with the SEC) may reference contract addresses
In other words, the contracts are not created at redemption time. They are part of the infrastructure that is live from day one of the fund’s launch.
3) How are BUIDL / BSTBL smart contracts structured?
— Smart contracts are “contracts written in code”
A smart contract is not “just a program.” As the name suggests, it is a contract expressed in code between parties. In tokenized MMFs, multiple parties are effectively entering into this coded contract structure.
✔ Key parties involved in the smart contract
- Fund manager (e.g., BlackRock): manages the underlying assets, acts as contract admin, sets rules for minting, burning, and redemption
- Investors (wallet holders): buy the token and hold a claim on the fund, with rights to redeem and receive yield enforced by the contract
- Custody/administration providers: hold the real‑world assets and ensure 1:1 backing between on‑chain tokens and off‑chain assets
- Regulators (e.g., SEC): oversee structure and operations; in some cases, contract details and addresses appear in filings
✔ Contract structure of BUIDL / BSTBL
① ERC‑20 token contract (equity/claim contract)
Issues the fund token, tracks balances, transfers, and ownership. Economically, “holding the token = holding a claim on the fund.”
② Issuer / Controller contract (mint/burn/redemption contract)
Mints tokens when investors subscribe, and burns tokens when they redeem, while paying out cash or stablecoins. This is the coded form of the promise that “the manager will honor redemption requests.”
③ NAV update and yield distribution contract
Automatically reflects fund performance and distributes yield via NAV changes, on‑chain distributions, or rebasing mechanisms.
④ Upgrade / admin module (governance and maintenance contract)
Handles security patches, regulatory changes, and operational updates — the coded expression of the manager’s responsibility to maintain the contract system.
4) To which contract are tokens returned at redemption?
Redemptions are processed through contracts that were already deployed at fund launch.
✔ Types of contracts used for redemption
① Issuer contract (mint/burn)
The most common pattern: on redemption, the contract burns the tokens and pays out cash or stablecoins.
② Redemption contract (redemption‑only)
Used more often in institutional setups, where redemption requests, approvals, and payouts may follow a stricter workflow, including KYC/AML checks.
✔ Redemption flow summary
- Investor sends tokens back to the contract
- The contract burns the tokens
- Pre‑funded cash or stablecoins are paid out
- Settlement is completed on‑chain, near‑instantly
🧩 In summary: Tokenized MMFs are the most tangible future of on‑chain finance
Tokenized MMFs are not just “funds on a blockchain.” They are a flagship success case of on‑chain finance, combining the stability of traditional money‑market funds with the automation and transparency of blockchain.
- Global MMF exposure with just a wallet
- Yield paid automatically via smart contracts
- Redemptions processed programmatically and quickly
- All core mechanics visible and auditable on‑chain
As more financial products move on‑chain, this model is likely to spread. Tokenized MMFs are not the end state, but they are one of the most practical and mature examples of what institutional on‑chain finance looks like in the real world.
Younchan Jung
Researcher exploring structural shifts in AI, blockchain, and the on‑chain economy.
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