RUNE as the Universal Settlement Asset

RUNE is not just a governance or security token — it is the backbone that makes THORChain’s cross-chain AMM possible.

The Settlement Layer

Every swap between two external assets on THORChain must route through RUNE:

BTC → RUNE → ETH

This design has profound implications:

• Every liquidity pool is paired against RUNE (BTC/RUNE, ETH/RUNE, etc.).
• RUNE provides deep, shared liquidity across all pools.
• Price discovery and slippage calculations are unified through a single asset.

Why This Architecture?

Traditional multi-asset AMMs require every pair to have direct liquidity (BTC/ETH, BTC/USDT, etc.). This fragments liquidity and creates poor prices for exotic pairs.

By forcing all trades through RUNE, THORChain achieves:

• Unified liquidity depth — capital in any RUNE pool helps every other pool.
• Simple pricing — only one price per asset needs to be tracked (asset/RUNE).
• Economic security — RUNE bonds and liquidity are tightly coupled.

Practical Effects

• Large trades in one pool can affect pricing in seemingly unrelated pools because they all share the RUNE side.
• RUNE acts as a "universal gas token" for the liquidity layer.
• The Incentive Pendulum directly modulates how much RUNE flows into bonding vs. pooling.

RUNE’s role as settlement asset is one of the most under-appreciated but fundamental aspects of THORChain’s design. It is what allows the protocol to scale to many chains without liquidity fragmentation.