Tokenizing an asset puts a claim on it onchain. Making that token useful in DeFi, as collateral, in a vault or in a trading pool, is a separate and harder problem, because DeFi assumes permissionless, instantly transferable, oracle-priced tokens and most real-world assets are none of those.
This page focuses on that second problem: composability. For the issuance side, including legal structures and investor onboarding, see the tokenization platform guide and the overview of tokenized asset offerings.
Why tokenized assets and DeFi clash
- Transfer restrictions. Securities tokens usually only move between verified, eligible wallets. A lending pool or AMM contract is not a verified investor unless you make it one.
- Pricing. A tokenized fund has a net asset value published once a day, not a continuous market price.
- Redemption. Turning the token back into cash may take a business day or more and may only be available to certain holders.
- Legal finality. The issuer can freeze, force-transfer or reissue tokens to comply with court orders. That is a feature for regulators and a risk for any protocol holding the token.
Tokenized US Treasury funds, such as BlackRock's BUIDL, launched in 2024 with Securitize, show the pattern: the fund token itself is restricted, and DeFi access comes through specific integrations and wrappers rather than open listing.
Building blocks
| Component | Purpose | Common choices |
|---|---|---|
| Permissioned token | Enforce who can hold and transfer | ERC-3643 (T-REX) with an onchain identity registry; ERC-1400-style partitions |
| Identity layer | Prove KYC and eligibility without exposing data | Onchain claims or attestations issued by a verifier |
| NAV oracle | Publish the official value per token | Issuer- or administrator-signed feeds, often relayed by an oracle network |
| Vault wrapper | Give DeFi a standard interface | ERC-4626 vault holding the restricted token |
| Redemption module | Exit to cash or stablecoins | Request queue with settlement windows, or an instant facility backed by a liquidity buffer |
Permissioned tokens
ERC-3643 checks every transfer against an identity registry and a compliance contract that can encode rules such as investor caps per country or holding limits. To use the token in a DeFi protocol, the protocol's contracts must be registered as eligible holders, which means the issuer is explicitly approving that integration.
Wrappers and vaults
Wrapping the restricted token in an ERC-4626 vault gives integrators a familiar interface. The wrapper can itself be permissioned, or it can be open if regulators and the issuer accept that, for example for a stablecoin-like product. Be clear in documentation about which it is.
Pricing and oracles
Lending markets need a price for liquidations. A daily NAV is fine for low-volatility assets like short-term treasuries, but a protocol that liquidates against it must account for staleness, the possibility of a NAV error, and the gap between NAV and what a liquidator can actually realize. Use conservative loan-to-value ratios and supply caps.
Common DeFi integrations
- Collateral in lending markets. Often through isolated or permissioned markets so the RWA cannot contaminate the rest of the pool. The lending platform guide covers isolation design.
- Stablecoin reserves. Tokenized treasuries backing stablecoins, which are now regulated under regimes like MiCA in the EU and the GENIUS Act in the US.
- Permissioned liquidity pools where only verified addresses can trade, giving holders secondary liquidity.
- Yield vaults that hold tokenized treasuries as a low-risk base layer.
Development process
- Agree on the legal wrapper and transfer rules with counsel and the issuer before choosing a standard.
- Implement the token and identity layer, with tested freeze, recovery and forced-transfer functions and clear governance of who may call them.
- Build the NAV feed with signatures, staleness checks and an incident process for corrections.
- Add the vault wrapper and redemption flow, including what happens when redemptions exceed the liquidity buffer.
- Negotiate each DeFi integration individually and audit the combined system, not just your contracts.
Frequently asked questions
Can a tokenized security trade on a normal DEX?
Not if its transfer rules are enforced: the pool contract would be blocked. You need a permissioned pool or an approved wrapper.
What happens if the issuer freezes tokens held by a protocol?
Positions backed by them become illiquid or worthless onchain. Protocols should cap exposure and document this risk to users.
Why not just issue an unrestricted token?
For some assets, such as a fully reserved stablecoin under an applicable regime, open transferability is possible. For securities, removing transfer controls usually breaks the offering exemption and the issuer's obligations to know who holds the asset.
Which chain should I use?
Ethereum and its major layer 2s have the most DeFi integrations; some issuers also use other chains. Choose where your target protocols and investors already are.