FRS encodes RWA carrying costs on-chain without breaking DeFi composability

Tokenized real-world assets (RWAs) like digital gold and warehouse receipts have a problem: physical assets incur structural negative carry — custody, insurance, and audit costs that accumulate over time [^claim_738]. Existing models manage these costs at the issuer level, leaving token holders with opaque fee structures and breaking the clean on-chain accounting that institutional capital demands [^claim_739]. The Fungible Reserve Standard (FRS) solves this by encoding carrying costs directly into the token’s on-chain logic, without sacrificing the composability that makes DeFi useful.

FRS introduces an asset-per-token variable q(t) that decreases according to a predefined annualized carrying cost rate [^claim_741]. This deterministic decay represents the real cost of holding the underlying physical asset. Crucially, FRS couples this with a supply reconciliation mechanism that adjusts total supply rather than individual balances, preserving holder balances and ERC-20 composability [^claim_742]. By avoiding token rebasing — the mechanism used by stETH or Ampleforth — FRS tokens remain fungible and can be used as drop-in collateral in Aave, Compound, or Uniswap without special adapter contracts [^claim_740].

The design encodes actual operational carrying costs to provide institutional-grade accounting clarity without compromising DeFi compatibility [^claim_743]. For protocols like Ondo Finance or M^0 that issue yield-bearing or cost-bearing RWA tokens, FRS offers a standardized primitive that regulators and auditors can verify on-chain. The framework is asset-agnostic and applicable to any real-world asset with positive, predictable holding costs — from tokenized uranium and copper to grain inventories [^claim_744].

For the crypto ecosystem, FRS bridges a gap: it turns RWA tokens into first-class DeFi citizens while giving issuers a transparent, auditable cost accrual mechanism. The next question is how to verify that the declared carrying cost rate matches actual off-chain custody invoices — a problem that points toward zk-oracles or TEE attestations at the RWA oracle layer. FRS doesn’t solve that, but it makes the on-chain half of the problem tractable.