Why Does Pendle's Fixed Yield Return Change?

Conclusion First

Pendle's "fixed yield" on the page does not equal an unchanging APY forever. More precisely, users typically obtain a yield opportunity related to the maturity date by purchasing PT (Principal Token) at a price lower than its redemption value at maturity. At the time of trade execution, the purchase price and redemption relationship affect the implied yield of the transaction; however, the current APY displayed on the page will still change as the market reprices.

This article discusses Pendle fixed-rate paths within OneKey's currently supported asset scope. OneKey's actual support scope is subject to the assets, networks, and paths displayed on the product page or interface at the time of operation. This article does not infer support conditions for other wallets, exchanges, or protocols. Information involving product interfaces, market quotes, and support scope is subject to change; the query date is 2026-07-31. Before actual operation, please refer to the OneKey product page and Pendle official documentation.

What Pendle's Fixed Yield Actually Fixes

Pendle splits interest-bearing assets with future yields into two parts: PT represents the principal portion, and YT (Yield Token) represents the right to yields before maturity. When users purchase PT, they typically transact at a price lower than its redemption value at maturity. If held to maturity, and the underlying asset, protocol mechanism, and redemption process function normally, the difference between the purchase price and the redemption value at maturity constitutes the main source of yield.

Therefore, fixed yield is closer to a conditional outcome. The following conditions must typically be met simultaneously:

• The PT purchased has a clear maturity date;
• The purchase price at the time of the transaction and the corresponding implied rate have been determined;
• The underlying asset and protocol mechanism are operating normally;
• Hold to maturity, or accept the market price at the time of exit;
• Factor in trading fees, network fees, slippage, exchange rate changes, and other risks.

The APY on the page is typically an annualized metric converted from the current PT price, redemption value at maturity, and remaining time. It describes the market quote at a specific point in time, is not a commitment to yields for all future times, and does not necessarily equal the net yield after deducting all costs.

Why APY Changes

PT Market Price Is Changing

PT can usually be traded before maturity. When buying demand increases, the PT price may rise, reducing the discount relative to the redemption value at maturity; users who buy later may therefore receive a lower implied yield. If selling pressure increases, the PT price may fall, widening the discount, and new buy quotes may display a higher APY.

This is somewhat similar to the relationship between bond prices and yield to maturity: after the price changes, new buyers face a new yield. Opening the same maturity series at different times and seeing different APYs does not necessarily mean the protocol has modified already executed transactions; more often, the market is repricing.

Remaining Time to Maturity Decreases Daily

Annualized APY converts expected yield into a one-year indicator. Even if the PT price does not change significantly in the short term, as the maturity date approaches and remaining time continues to decrease, the annualized calculation result may also change.

Near maturity, quotes may also experience greater fluctuations due to price precision, market depth, and small trade impacts. However, a higher annualized number does not mean the same scale of absolute yield can be obtained. When comparing different products, one should simultaneously consider purchase price, redeemable value at maturity, and remaining term, rather than focusing only on APY.

Market Expectations of Future Yields Change

YT represents the right to yields before maturity. Changes in the underlying asset's actual yield, reward levels, interest rate sources, market demand, or protocol parameters will affect participants' judgments about future yields, thereby influencing the relative prices of PT and YT.

PT and YT have different risk exposures. PT holders are more concerned with the principal's redemption relationship at maturity; YT holders are more directly exposed to future yield changes. One cannot simply infer that PT's fixed yield has been altered because YT performance has changed, nor can one treat a particular YT's yield as PT's actual return.

Liquidity and Slippage Affect Final Execution Price

Quotes on the page may be reference prices; actual execution also depends on trade size and market depth. If liquidity is insufficient, a large order may cross multiple price levels, causing the average execution price to differ from the initial page quote.

This impact is more pronounced when exiting early. You need to sell at the then-current PT market price or convert back to other assets via available paths. Price impact, slippage, network congestion, and trading fees will all reduce the final net return. The APY shown at purchase cannot be directly treated as a yield guarantee for early sale.

Pricing Units and Conversion Paths May Differ

Some pages are priced in the underlying asset, while others may display value in stablecoins, USD, or other units. Even if the PT quantity changes as expected, if the price of the underlying asset versus fiat changes, the return calculated in fiat may still differ.

Cross-asset conversions may also generate exchange rate fluctuations, conversion fees, and additional slippage. Therefore, before analyzing a transaction, confirm the APY pricing unit and whether the page displays gross yield or an estimate after deducting certain fees. If the interface does not clearly state this, do not interpret the displayed numbers as a net yield commitment.

A Simplified Example

Suppose a certain PT can be redeemed for 1 unit of the underlying asset at maturity, with a current price of 0.96 units and approximately 6 months remaining until maturity. If held to maturity with no fees or anomalies, the difference between the purchase price and the redemption value at maturity is approximately 0.04 units, and the page will convert this into an implied annualized yield.

If the market price later rises to 0.98, new buyers only receive a 0.02-unit discount, and the new APY will typically be lower than the previous quote. If you sell at this point, whether you profit depends on the actual selling price, trading fees, and slippage, not the current APY now displayed on the page.

Conversely, if the PT price falls to 0.94, new buy quotes may display a higher APY, but prior buyers who choose to exit at this time may also realize a paper loss. This example is only for illustrating the pricing relationship and does not represent OneKey or Pendle's actual rates, product parameters, or available entry points.

The Difference Between Holding to Maturity and Exiting Early

The core of holding to maturity is waiting for PT to redeem according to the corresponding maturity mechanism; exiting early requires facing the market price again. The two methods have different risk structures:

• Holding to maturity: Primarily concerned with whether the underlying asset, protocol, smart contracts, and maturity redemption mechanism are functioning normally, while bearing opportunity costs and liquidity constraints.
• Exiting early: In addition to the above risks, also bears PT price at exit, liquidity, slippage, network fees, and conversion path risks.
• Repurchasing in the secondary market: New purchase prices and new remaining terms will form new implied rates; the original holder's quote cannot be reused.

"Fixed" does not equal "can be redeemed at a fixed price at any time." Before placing an order, confirm whether the product has matured, whether available trading or conversion paths exist, and the page's explanations regarding fees, restrictions, and supported assets.

Check These Items Before Operating in OneKey

OneKey's current support scope is limited to the Pendle fixed-rate assets actually displayed on the product page or interface at the time of operation. The existence of a market on the Pendle official website does not mean that market is already available in OneKey. It is recommended to check the following:

• Assets and networks: Confirm that the asset, network, and account type are consistent with what is currently displayed on the OneKey page.
• PT or YT type: Confirm whether purchasing PT or YT, and verify the corresponding maturity date; products with similar names do not imply identical risks.
• Quote time: Record the price, implied rate, remaining term, and expected quantity to be received at the time of order placement. Quotes will change with the market.
• Redemption rules: Read the explanations regarding maturity, redemption, and underlying assets in the corresponding product and Pendle official documentation.
• Execution quality: Check estimated slippage, minimum quantity to be received, network fees, and other fees; pay special attention to liquidity for large trades.
• Exit plan: If funds may be needed before maturity, understand available exit paths in advance and the impact of price fluctuations on the outcome.
• Signature content: Verify the transaction network, interaction target, and authorization scope; do not sign requests that cannot be explained.

If the rate displayed on the page is inconsistent with expectations, pause the operation and reconfirm the maturity date, pricing unit, quote refresh time, and whether the asset is still within the current support scope. Do not use old screenshots, search results, or third-party pages as substitutes for real-time product page information.

How to View Higher APY

Higher APY may come from a lower PT purchase price, shorter remaining term, weaker liquidity, or higher market uncertainty regarding the underlying future yields. It is not an unconditional additional return.

Especially near maturity or when trading depth is thin, annualized numbers may appear very high, but both the absolute yield obtainable and the executable amount are limited. A more meaningful way to compare is to simultaneously view purchase price, redemption value at maturity, remaining term, estimated net fees, liquidity, and possible outcomes upon early exit.

Risk Disclosure

Pendle fixed-rate paths are not equivalent to risk-free deposits and do not guarantee principal or yields. Actual results may be affected by factors such as PT/YT pricing, underlying asset yields, smart contract vulnerabilities, protocol or oracle failures, insufficient liquidity, slippage, network congestion, trading fees, asset price and exchange rate changes. Holding to maturity cannot eliminate underlying asset and protocol risks; early exit may also result in execution at a market price below the purchase price.

This article is for general information and pre-operation understanding only and does not constitute investment, legal, or tax advice. Product support scope, interfaces, fees, and market data are subject to change; the query date is 2026-07-31. Please refer to the latest information on the OneKey product page and Pendle official documentation.

References

• Pendle Official Documentation: Introduction — Pendle
• Pendle Official Documentation: Standardized Yield — Pendle
• Pendle Official Documentation: AMM Mechanism — Pendle
• Pendle Official Documentation: Redeeming — Pendle
• OneKey Official Help Center — OneKey