Yield-bearing NAV oracles explained

A new asset class hit Solana in 2025–2026: yield-bearing stables. Unlike USDC (“1 token = $1 of bank deposit”), these tokens represent a share of a portfolio that earns yield. Their per-share value rises over time. Calling them “stablecoins” is technically wrong — they’re tokenized funds. Five of them live on Solana today:

• USDY — Ondo’s T-bill token
• sUSD — Solayer’s T-bill + restaking MEV
• syrupUSDC — Maple’s institutional lending
• sUSDe — Ethena’s funding-arb
• ONyc — OnRe’s reinsurance

Each has a redemption price published by its issuer that grows according to the strategy. Two more are in active integration: USD* (Perena multi-stable pool) and pbUSDC (Piggybank funding-arb vault).

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Why the formula is different

For USDC, the answer to “what’s the peg?” is “$1, always." Compare market to$1, you’re done. For USDY, the answer to “what’s the peg?” is “the NAV Ondo published 3 minutes ago, which is $1.078 as of today." If you compare USDY's market price to$1, you’ll think it’s catastrophically over-pegged. It isn’t — it’s correctly priced against a NAV that’s grown 7.8% over its lifetime. So the formula becomes: **peg = NAV, not peg = $1**. The discount you actually care about is `market - NAV`, not `market -$1`. A market price below NAV is redemption stress; a market price above NAV is buy-side demand running ahead of the issuer’s published rate.

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How NAV gets on chain

Three patterns dominate today on Solana: Pyth Redemption Rate (USDY, syrupUSDC, sUSDe, ONyc). The issuer signs and pushes a redemption price to a dedicated Pyth feed. Pegana subscribes to the SSE stream and reads it the moment it’s published. Staleness gate: 30s — older readings are refused so you don’t act on a NAV from yesterday. Token-2022 InterestBearing extension (sUSD). The mint itself stores a rebasing rate. Reading it is a getAccount on the mint and a small calculation. Pegana’s solayer_susd adapter does this every 15s. Issuer dashboard scrape (Perena’s USD*, Piggybank’s pbUSDC). When the issuer hasn’t published a Pyth feed yet, Pegana falls back to scraping the issuer’s published NAV from its dashboard. These are explicitly marked verified=false in assets.toml until a real feed lands.

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The market side is trickier than it looks

Yield-bearing stables are often thin. Maple’s syrupUSDC has institutional liquidity but limited DEX depth. ONyc trades on a couple of venues. The Jupiter route quote can swing meaningfully on small order sizes. Pegana mitigates this in two ways:

1. Thresholds for yield-bearing assets are widened — sUSD’s drift threshold is 2.19%, not 0.30%, because its 24h p99 sits up there by design.
2. Confidence label. The engine tags low-liquidity feeds with a confidence label so downstream consumers can decide whether to act on a thin-market signal. See confidence score.

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When the NAV itself is the risk

Sometimes the depeg isn’t market < NAV — sometimes the NAV itself drops.

• ONyc’s NAV reflects underwriting performance: a catastrophic claim event drops the NAV directly.
• sUSDe’s NAV depends on positive perp funding: a sustained negative-funding regime stops the NAV from growing, may even reverse it.
• syrupUSDC’s NAV can be hit by a borrower default.

Pegana surfaces NAV drops as legitimate alerts even when market tracks NAV closely. The /explain command on the bot calls out the issuer-specific risks for each asset (T-bill shock, negative funding, claim event, borrower default) so subscribers see what could cause the next alert before it fires.

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What this means for builders

If you’re integrating yield-bearing stables as collateral, the cardinal sin is treating NAV as constant. A $1-pegged USDC oracle, applied to USDY, will overvalue collateral by 7.8% today and more tomorrow. Use the actual NAV feed. Pegana exposes both intrinsic_usd (NAV) and market_usd in the same payload so you can pick which one your protocol should price against.

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Read next

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Sources

• Ondo — USDY mechanics
• Solayer — sUSD design
• Ethena — sUSDe
• Maple — syrupUSDC
• OnRe — ONyc
• Pyth — Redemption Rate feeds