Add PT-sUSDe-24SEP25 Market to FiRM

Forum Post: https://forum.inverse.finance/t/onboard-pt-susde-24sep25/576

Summary

This proposal seeks to integrate the PT-sUSDe-24SEP25 token from Pendle as a collateral asset on FiRM, Inverse Finance’s fixed-rate lending protocol. Like its predecessor (the successfully onboarded PT-sUSDe-31JUL25), PT-sUSDe-24SEP25 is a Principal Token representing the right to receive 1 USDe upon maturity—this time on September 24, 2025.

Background

Pendle Finance is a yield-trading platform that tokenizes yield-bearing assets into two components:

• Principal Tokens (PTs), redeemable for the underlying asset at maturity;
• Yield Tokens (YTs), which accrue the asset’s yield until expiry.

After a successful integration of PT-sUSDe-27MAR2025 on FiRM in late 2024, demand for PT-based strategies has proven to be strong. This new PT, PT-sUSDe-24SEP25, extends the maturity date and aims to offer continued opportunities for fixed-income and carry-trade strategies, leveraging FiRM’s fixed-rate borrowing.

Price Feed

Similarly to the previously onboarded PT-sUSDe-31JUL25 market, we intend to use a discount to NAV price feed. This feed accounts for the zero-coupon nature of the PT by applying a fixed discount rate to par value that exponentially converges to $1 as maturity nears. Only two main parameters—discount rate and time (block #) of maturity—must be configured. Importantly, by setting a conservative discount rate, the protocol intentionally underprices the PT relative to potential market optimism, which is safer from a protocol risk perspective.

Business Case

The 31 July PT demonstrated strong initial borrower interest. FiRM was on track to originate eight-figure debt volumes, only to see that momentum diverted when Aave pre-emptively raised its caps from $800 million to $1.3 billion. By the time our July market cleared governance, prospective borrowers had already migrated their positions to Aave’s more attractive rate environment.

With the PT-sUSDe-24SEP25, we have a clear window to regain first-mover advantage:

• Early Listing: Propose and onboard the September PT before competing platforms such as AAVE finalize their cap increases, locking in early movers at compelling rates.
• Seamless Rollover: Offering a continuous pathway from the 31 July PT into the September PT reassures potential borrowers on the July PT of uninterrupted exposure, reducing churn and building protocol stickiness. With rates on competitors such as AAVE and Morpho raising, it could soon be very attractive for users to migrate to FiRM to lock in cheaper rates.
• Debt Growth: Early origination not only recaptures deferred volume from July’s market but also secures incremental debt against a high-demand tenor.

Therefore, onboarding the September PT ahead of peers is critical to reasserting FiRM’s position in the fixed-term lending landscape, maximizing debt supply, and strengthening borrower confidence in rollover availability.

Risk Assessment

Please see the Risk Assessment carried out by the RWG for PT-sUSDe-24SEP25 Collateral on FiRM here.

With the following parameter recommendation:

These parameters are accepted and will be pushed forward in this proposal.