[BIP-894] Kill Stream Gauges

https://github.com/BalancerMaxis/multisig-ops/pull/2572

Summary

The purpose of this publication is to kill four Stream gauges:

• xUSD/vgUSDC (Mainnet)
• xUSD/vgUSDC (Arbitrum)
• xUSD/mevUSDC (Avalanche)
• xBTC/mevBTC (Avalanche)

Motivation

On November 4, 2025, Stream Finance disclosed a $93 million loss through an external fund manager, leading to the immediate suspension of all withdrawals and deposits. As a consequence, tokens have depegged and no longer serve any practical utility.

The xUSD/vgUSDC pool is particularly affected: vgUSDC is a Silo vault that allocated to xUSD and now has no available liquidity, resulting in zero volume in recent days despite attracting significant votes due to its Core Pool status. These gauges should be killed to prevent further emissions to pools with no productive use.

Specification

Gauge Addresses

Pool	Network	Gauge Address
xUSD/vgUSDC	Mainnet	0xc13a3315806f097cee00e39c4285f5bf250dd8a4
xUSD/vgUSDC	Arbitrum (Root)	0x8c8722786aa9651b65425680642564a12e2dd854
xUSD/mevUSDC	Avalanche (Root)	0x4f23CCC4349E9500d27C7096bD61d203F1D1C1Aa
xBTC/mevBTC	Avalanche (Root)	0xc429d0602365f09a9257be3be14c94b83cbbbb37

Technical Details

• Gauge Controller: 0xf5dECDB1f3d1ee384908Fbe16D2F0348AE43a9eA
• Kill Function Selector: 0xab8f0945
• Safe Multisig: 0x9ff471F9f98F42E5151C7855fD1b5aa906b1AF7e