Why on-chain
The gap
Section titled “The gap”Structured notes are the one large equity product that tokenised stocks have not yet reproduced. On Robinhood Chain there are spot AMMs, perps, stock-collateral lending, vanilla options and index vaults; there is no structuring desk and no barrier-option market. Roughly $538bn of callable structured notes were issued globally in 2025 according to ETFGI, and autocalls made up over 43% of the $195bn US structured-product market according to SRP. In DeFi, Ribbon settled a single OTC ETH autocallable in 2023 with Marex and MEV Capital, per CoinDesk, and nothing has followed at scale.
The reason is structural. Autocallables exist because a bank sits in the middle, warehouses the embedded barrier option and hedges it. Every DeFi structured-product vault so far (Ribbon, Thetanuts, Cega) sold vanilla options one-sidedly. None built the two-sided barrier market, the autocall feature, or a tradable note token.
Why it is possible now
Section titled “Why it is possible now”fact Stock Tokens on Robinhood Chain are plain ERC-20s with per-asset Chainlink feeds that already incorporate dividends and splits via the ERC-8056 multiplier, per the Robinhood building guide. Prices are observable at official closes and transfers settle atomically. That is enough to escrow both sides of a barrier note and settle it without a bank.
Why fully collateralised
Section titled “Why fully collateralised”A bank-issued note is an unsecured claim on the issuer. Note Systems instead escrows the note buyer’s notional and the stock holder’s maximum coupon liability at subscription. Every possible payout is funded before the series goes live, which is why the protocol has no liquidation engine and no oracle-triggered margin calls. The trade-off is capital efficiency: SHIELD must prefund coupons up to the governance cap. See Escrow invariant.
Why observations only at official closes
Section titled “Why observations only at official closes”Tokenised stocks trade 24/7 while the reference market does not. Weekend prices drift away from the Friday close, a pattern documented by OpenChainBench. Note Systems observes only at the official US equity close as defined by the on-chain MarketCalendar, so a note can never be knocked in or called by an off-hours print. See Oracle and MarketCalendar.
Why a token engine with real cash flows
Section titled “Why a token engine with real cash flows”The token design borrows OlympusDAO’s three engines (bonds, staking, protocol-owned reserves) and replaces emissions with fees paid in USDG. The precedent is a caution rather than a template: OHM peaked near a $4.35bn market capitalisation and then fell 80% to 90% within months, as reported by The Block. Cash coupons make the design more durable, not immune. See NOTE and Market risk.
Indicative revenue
Section titled “Indicative revenue”illustrative Single-stock autocallables on ~50% implied-vol names typically pay 15% to 30% p.a. with 60% to 70% barriers in traditional markets; the Calamos index-linked version pays about 14% with a 40% buffer (ETFGI). Assuming a 20% blended annual coupon, the specification’s 15% coupon fee and 0.25% notional fee:
| COUPON notional outstanding | Annual protocol fee (est.) | Reference point |
|---|---|---|
| $25m | ~$0.8m | About twice all Stock Token DeFi deposits on Robinhood Chain in July 2026 ($11.8m per Crypto Briefing) |
| $250m | ~$8m | About five times Solana tokenised-stock lending TVL (KuCoin) |
| $1bn | ~$33m | Calamos CAIE/CAIQ reached $1bn in 10 months in a fund wrapper (ETFGI) |
Fee arithmetic: 20% × 15% = 3.0% of notional per year from coupons, plus 0.25% of notional per series at strike (about 0.25% to 1% per year depending on tenor and autocall frequency). These are estimates, not projections.