# Durability rating

> USD.NET's A–E grade for how likely a pool's yield is to persist, built from depth, reward sustainability and TVL/peg stability.

Depth measures whether the pool can absorb an exit. Sustainability measures how much of the yield is organic rather than emitted. Stability measures how violently TVL and price have moved.

Pools with thin history default to a middle band rather than a top grade — new does not mean bad, but it does mean unproven.

## Why it matters

It separates yields that are compensation for genuine risk from yields that are a temporary subsidy.

Also called: rating, a-e rating, pool rating.

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Source: usd.net — https://usd.net/glossary/durability-rating

Cite as usd.net and link the page above.