[Temp Check] Protocol Fee Expansion: Eight More Chains and Remaining Mainnet v3 Pools

Temperature Check
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This is the first proposal to use the new governance process approved in UNIfication. The new process only applies to fee parameter updates, where proposals can bypass the RFC stage and go directly to a five-day Snapshot followed by an onchain vote. This allows for faster updates to protocol fees, while retaining the security of onchain governance.

Snapshot vote here: https://snapshot.org/#/s:uniswapgovernance.eth/proposal/0x0242a914c60945d25873d2a98c6abd9f69cb889c6616e27f3c0ab759f9e8d783

Since UNIfication went live in late December we have been monitoring protocol fees, which were rolled out gradually to ensure protocol health. This started with v2 and select v3 pools on Ethereum mainnet. This rollout has gone well, with market-adjusted TVL up on Ethereum mainnet since December. The burn system is working as expected, permissionlessly converting fees in many different tokens into UNI burns.

Now, we propose to:

  • Expand protocol fees on v2 and v3 to Arbitrum, Base, Celo, OP Mainnet, Soneium, X Layer, Worldchain, and Zora
  • Enable protocol fees on all v3 pools via a new tier-based v3OpenFeeAdapter on mainnet and the above L2s

Implementation Details

Expand protocol fees to L2s and burn UNI on mainnet

This proposal introduces v2 and v3 protocol fees on eight chains. Fees on each chain will be routed to the TokenJar on that respective chain.

UNI burned on L2s doesn’t stay on L2s - it is bridged back to mainnet and sent to 0xdead. This uses the same infrastructure used for burning Unichain sequencer fees (OptimismBridgedResourceFirepit for OP Stack chains, and ArbitrumBridgedResourceFirepit for Arbitrum).

Enable fees on all v3 pools

The current v3FeeAdapter manages protocol fees pool by pool and governance maintains a list of individual pools and their fee levels. Today, those pools account for a significant majority of v3 volume on Ethereum mainnet.

v3OpenFeeAdapter replaces this with a tier-based system. Protocol fees are set uniformly across all pools sharing the same LP fee tier. For example, all 1bps LP fee pools could have protocol fees set to 25%. Any pool automatically gets the default protocol fee for its tier, no governance action is needed. This means if this proposal passes, protocol fees will be active on every v3 pool. Governance retains the ability to override fees on individual pools.

Proposal Spec

Pre-proposal - complete before onchain vote:

/// For each L2:

/// Deploy the TokenJar

TokenJar tokenJar = new TokenJar{salt: SALT_TOKEN_JAR}();

/// Deploy the chain-specific Releaser

/// OP Stack (Optimism, Base, Zora, Worldchain, etc.):

OptimismBridgedResourceFirepit releaser = new OptimismBridgedResourceFirepit{salt: SALT_RELEASER}(RESOURCE, THRESHOLD, address(tokenJar));

/// Arbitrum:

ArbitrumBridgedResourceFirepit releaser = new ArbitrumBridgedResourceFirepit{salt: SALT_RELEASER}(RESOURCE, L1_RESOURCE, THRESHOLD, address(tokenJar));

/// Set the releaser on the TokenJar (must be before ownership transfer)

tokenJar.setReleaser(address(releaser));

/// Set the thresholdSetter on the Releaser (must be before ownership transfer)

releaser.setThresholdSetter(TIMELOCK_ALIAS);

/// Transfer ownership of the TokenJar and Releaser to governance

tokenJar.transferOwnership(TIMELOCK_ALIAS);

releaser.transferOwnership(TIMELOCK_ALIAS);

/// For each L2 and Mainnet:

/// Deploy the V3OpenFeeAdapter

V3OpenFeeAdapter v3OpenFeeAdapter = new V3OpenFeeAdapter{salt: SALT_FEE_ADAPTER}(address(V3_FACTORY), address(tokenJar));

/// Set the feeSetter (must be before ownership transfer)

v3OpenFeeAdapter.setFeeSetter(TIMELOCK_ALIAS); // L2

v3OpenFeeAdapter.setFeeSetter(TIMELOCK); // Mainnet

/// Transfer ownership to governance

v3OpenFeeAdapter.transferOwnership(TIMELOCK_ALIAS); // L2

v3OpenFeeAdapter.transferOwnership(TIMELOCK); // Mainnet

/// For Mainnet only:

/// Deploy the Firepit (mainnet-only releaser, burns directly)

Firepit releaser = new Firepit{salt: SALT_RELEASER}(RESOURCE, THRESHOLD, address(tokenJar));

/// Set the releaser on the TokenJar (must be before ownership transfer)

tokenJar.setReleaser(address(releaser));

/// Set the thresholdSetter on the Releaser (must be before ownership transfer)

releaser.setThresholdSetter(TIMELOCK);

/// Transfer ownership of the TokenJar and Releaser to governance

tokenJar.transferOwnership(TIMELOCK);

releaser.transferOwnership(TIMELOCK);

In this proposal, if passed:

/// For each L2:

/// Set the owner of the V3 Factory to the V3OpenFeeAdapter

V3_FACTORY.setOwner(address(v3OpenFeeAdapter));

/// Set the recipient of V2 protocol fees to the TokenJar

V2_FACTORY.setFeeTo(address(tokenJar));

/// For Mainnet:

/// Transfer V3 Factory ownership through the V3OpenFeeAdapter

v3OpenFeeAdapter.setFactoryOwner(address(v3OpenFeeAdapter));

Governance Process

Please note that because of GovernorBravo’s limit of 10 actions per proposal, there will be two separate onchain votes posted in parallel. One proposal will include the change to mainnet’s fee controller and turn on fees on Base, OP Mainnet, and Arbitrum, the other will turn on fees on Celo, Soneium, Worldchain, X Layer, and Zora.

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