Safe Wallet on Layer 2s: Cost Comparison—Arbitrum vs. Optimism vs. Polygon for Multisig Operations

A team managing a shared treasury across EVM-compatible networks faces a practical question: which blockchain minimizes both setup costs and ongoing operational expenses for multisignature operations? Safe Wallet, formerly Gnosis Safe, has become the institutional standard for multisig asset custody on Ethereum and EVM-compatible networks, but gas fees vary significantly across different Layer 2 solutions. Deploying the same multisignature wallet on Arbitrum, Optimism, and Polygon produces dramatically different cost profiles—not just in initial deployment, but across transaction approval sequences, fund transfers, and governance actions over months of operation.

The choice between chains is not purely financial. Each EVM-compatible network offers different trade-offs in transaction finality, bridge security, liquidity depth, and ecosystem maturity. A DAO treasury moving millions of dollars cannot optimize only for gas cost; it must also account for counterparty exposure, withdrawal latency, and the operational complexity of managing assets across multiple venues. Yet for teams with flexibility in chain selection, understanding the actual cost structure of multisig operations can reveal whether Arbitrum’s high throughput, Optimism’s security alignment with Ethereum, or Polygon’s established adoption makes the best foundation for long-term treasury management.

How multisig gas costs differ from single-key operations

A standard Ethereum wallet transfer requires one signature and one transaction broadcast. A multisignature wallet introduces additional overhead because the contract must store pending transactions, collect signatures from multiple signers, verify each signature’s validity against stored signer addresses, and then execute the approved operation. This means a single user action on the frontend—approving a treasury payment, for example—often generates multiple on-chain transactions: the initial proposal submission, each signer’s approval, and finally the execution transaction that moves funds or calls external contracts.

On Ethereum mainnet, a typical Safe Wallet multisig approval might cost 50,000 to 100,000 gas per approval, plus execution costs ranging from 100,000 to 250,000 gas depending on the operation’s complexity. For a 3-of-5 configuration approving a simple token transfer, the total on-chain cost could reach 400,000 to 600,000 gas, translating to $100 to $500 in gas fees at current Ethereum mainnet prices. The same operation on EVM-compatible networks reduces that baseline dramatically because the networks themselves charge far less per unit of gas, though the number of operations required remains constant.

The structure of approval costs also depends on transaction batching and the wallet’s configuration. A Safe Wallet supports batch execution of multiple operations in a single transaction, which can reduce per-operation overhead when several transfers or smart contract interactions are grouped. However, batch operations are only efficient if the operations are already grouped at proposal time; sequential approvals across different proposals still require separate execution transactions.

Understanding this distinction is critical when evaluating cost comparisons. A single-signer wallet on any EVM-compatible network costs roughly the same amount per transaction because it requires one signing operation and one execution. A multisignature wallet’s total cost is sensitive to the number of signers, the approval threshold, transaction batching strategy, and how frequently the wallet architecture itself must be modified—such as adding or removing signers, adjusting the required signature threshold, or changing permissions.

Arbitrum gas economics and high-throughput multisig operations

Arbitrum is an Optimistic Rollup that batches transactions off-chain and posts compressed proofs to Ethereum at intervals. Because Arbitrum’s sequencer accepts transactions rapidly and the cost of posting to Ethereum is amortized across many transactions, gas prices on Arbitrum typically range from 0.1 to 0.5 gwei, compared to 20 to 100+ gwei on Ethereum mainnet. For a multisig approval operation consuming 60,000 gas, that translates to costs between $0.15 and $0.50 at current exchange rates, versus $12 to $60 on Ethereum mainnet.

The throughput advantage also benefits teams running frequent governance or treasury operations. If a DAO approves grants, rebalances positions, or executes hedges multiple times per week, Arbitrum’s low per-transaction cost removes a significant operational friction. A team with a 3-of-7 multisig executing 10 treasury transactions per month might pay $50 to $200 in cumulative gas on Arbitrum versus $6,000 to $30,000 on Ethereum mainnet. Over a year, that difference can amount to $600 to $3,600 for a moderately active treasury.

Arbitrum’s trade-offs include reliance on a sequencer controlled by Offchain Labs and an Optimistic Rollup dispute mechanism that imposes a 7-day withdrawal delay to mainnet. For a team moving large amounts of capital between chains or settling to mainnet frequently, that delay creates liquidity friction. The Arbitrum ecosystem also carries heavier EVM-compatible network complexity in terms of bridge security: the Arbitrum bridge depends on validators bonding capital and challenging invalid proofs, which is theoretically sound but less battle-tested than Ethereum’s 32-validator PoS staking.

Optimism’s finality alignment and moderate gas efficiency

Optimism uses a similar Optimistic Rollup design but prioritizes alignment with Ethereum’s security model. Optimism’s sequencer and validator set are managed by the Optimism Collective through governance, and the protocol explicitly targets long-term decentralization. Gas prices on Optimism typically range from 0.5 to 2 gwei, placing it between Arbitrum and Ethereum mainnet in terms of per-transaction cost. For the same multisig approval operation, costs would range from $0.30 to $1.20 per signature, making a 3-of-7 multisig approval slightly more expensive than Arbitrum but still well below mainnet.

The stronger institutional case for Optimism among EVM-compatible networks is its explicit commitment to Ethereum security and its position as the Layer 2 standard for many institutional applications. Coinbase’s Base is built on the Optimism stack, meaning governance decisions and protocol upgrades across multiple networks are aligned. For a DAO or organization already using Optimism or Base, deploying Safe Wallet on Optimism avoids bridge fragmentation and simplifies operational coordination.

Optimism also features the same 7-day withdrawal window for mainnet settlement, though its governance structure and broader adoption may reduce operational uncertainty for teams building long-term on Optimism. The ecosystem of DeFi protocols, stablecoin bridges, and liquidity pools on Optimism is mature, making treasury management and position hedging feasible without repeated bridge crossings.

A practical consideration for multisig teams is that Optimism’s slightly higher gas cost is often offset by ecosystem familiarity. If the team’s primary capital sources, counterparties, or DeFi operations are already on Optimism, the cost difference of $0.30 to $1.00 per transaction becomes negligible compared to the friction of bridge coordination.

Polygon for established liquidity and lower operational finality

Polygon operates as a Proof-of-Stake sidechain committed to Ethereum, rather than a true rollup. Transactions are finalized on Polygon within seconds, but achieving Ethereum finality requires periodic checkpoints—a process that can introduce delays but also provides immediate local finality for operations on Polygon itself. Gas prices on Polygon are the lowest of the three, typically ranging from 0.01 to 0.1 gwei, making multisig operations nearly free from a gas perspective. A 3-of-7 multisig approval might cost $0.01 to $0.05 in gas fees.

The financial advantage is undeniable for high-frequency operations or large teams with many signers. A DAO running 50 treasury transactions per month with a 7-of-12 multisig threshold could see cumulative gas costs of $5 to $15 on Polygon versus $50 to $150 on Optimism or $2 to $8 on Arbitrum. Polygon’s lower cost structure has made it the standard for gaming treasuries, retail DAOs, and organizations optimizing for operational simplicity rather than Ethereum security alignment.

However, Polygon’s lower operational finality means deposits and withdrawals between Ethereum and Polygon carry different custody implications than Optimism or Arbitrum. A team using Polygon as a treasury home base must understand that until the checkpoint is submitted to Ethereum—a process that occurs periodically but not instantaneously—capital is at risk if the Polygon network fork or validator set misbehaves. For large treasuries or institutional holdings, this risk profile may outweigh the gas cost savings.

Polygon also has mature adoption across DeFi, NFT, and gaming ecosystems, meaning treasury operations such as token swaps, liquidity provision, or collateral management often have deep liquidity pools and established counterparties. Many DAOs have been operating multisig treasuries on Polygon for years, providing operational precedent and community knowledge.

EVM-compatible networks and deployment architecture decisions

Choosing a single chain for a Safe Wallet treasury is increasingly rare for larger organizations. Instead, teams use an architecture that mirrors their capital distribution: primary operations on one EVM-compatible network, with secondary deployments for specific functions. For example, a DAO might maintain its core treasury multisig on Ethereum mainnet for institutional credibility and security, operational treasuries on Arbitrum for high-frequency transactions and low costs, and tactical holdings on Polygon or Optimism for specific yield opportunities or counterparty relationships.

This multi-chain approach introduces bridge risk and coordination overhead. Each Safe Wallet deployment on different EVM-compatible networks is a separate smart contract instance with its own signer configuration, pending transactions, and execution state. A transaction approved on Arbitrum’s Safe Wallet does not automatically execute on Optimism; each chain requires independent governance and fund management. For a DAO with signers distributed across geographies and time zones, managing multiple Safe Wallet instances can create operational friction and approval bottlenecks.

Some teams address this through Safe DAO’s cross-chain governance infrastructure, which can relay transactions across chains, though this adds latency and introduces additional smart contract dependencies. Others accept the operational complexity as the cost of optimizing individual chain operations: high-frequency, low-value transactions on Arbitrum; institutional-grade treasury management on Ethereum mainnet; and tactical operations on Polygon or Optimism where specific yield or liquidity is available.

The decision also depends on regulatory and audit requirements. Some institutional treasuries are audited on Ethereum mainnet specifically, making it a hard requirement regardless of gas costs. DAOs targeting venture or institutional capital often face expectations to anchor their primary treasury on Ethereum, even if it increases operational costs. For smaller teams or community DAOs, the flexibility to optimize cost across EVM-compatible networks may be unconstrained.

Operational costs beyond gas: bridge fees, custody overhead, and governance

Gas fees represent only one component of total custody cost. Moving capital between chains requires bridge usage, which may charge 0.1% to 0.5% in protocol fees or liquidity provider spreads. For a $1 million treasury rebalance across EVM-compatible networks, bridge costs might exceed $1,000 to $5,000—dwarfing the gas savings from choosing Arbitrum over Ethereum mainnet. A team must therefore balance gas optimization against bridge frequency and capital redeployment patterns.

Governance overhead also scales with chain complexity. Adding a new signer to a Safe Wallet multisig requires updating the smart contract configuration on every chain where the wallet is deployed. If a DAO has Safe Wallet instances on five different EVM-compatible networks and needs to rotate signers, that operation must be executed separately on each chain. Coordinating approvals across multiple chains, ensuring consistent signer sets, and tracking which configuration is active where introduces operational risk. A team might accidentally maintain different signer thresholds across chains, creating security inconsistency.

Smart contract upgrades and security patches also incur costs scaled by chain count. If Safe Wallet releases a critical upgrade—for instance, to close a vulnerability or add new features—teams must decide whether to upgrade all deployments simultaneously or stagger the process. Staggering upgrades across EVM-compatible networks reduces execution risk but increases the window where different chains run different smart contract versions, complicating governance.

Organizations should also account for the operational cost of monitoring and auditing multiple Safe Wallet instances. Treasury reporting, signer access reviews, and security audits become more complex as chain count increases. Many teams underestimate this overhead, treating each additional chain as a trivial addition when the actual coordination cost may be substantial.

Recommendations for team size, transaction volume, and risk tolerance

Small teams or early-stage DAOs with limited transaction volume and low capital amounts should optimize for simplicity rather than cost. A single Safe Wallet deployment on Polygon or Optimism is easier to manage, audit, and explain to new signers than a multi-chain architecture. Gas costs are effectively zero, and operational overhead is minimal. For teams managing under $10 million in assets and executing fewer than five treasury transactions per month, a single-chain approach on any of these EVM-compatible networks is defensible.

Mid-sized DAOs with $10 million to $100 million in assets and moderate transaction frequency benefit from hybrid strategies. Anchoring the primary treasury on Ethereum mainnet or Optimism for institutional credibility while maintaining an operational treasury on Arbitrum for frequent transactions reduces coordination overhead while preserving security alignment. This approach typically involves a 70/30 or 80/20 capital split, with the majority in the anchor chain and a working balance on the secondary chain.

Large institutions and established DAOs managing over $100 million should consider the full cost picture: institutional audit requirements, regulatory expectations, bridge security, and long-term governance scalability. For many large organizations, the gas cost difference between chains becomes negligible compared to custody architecture decisions, signer insurance, and regulatory alignment. These teams often anchor their Safe Wallet on Ethereum mainnet despite higher gas costs because institutional auditors, counterparties, and regulators expect the primary treasury on the Ethereum mainnet.

Teams should also evaluate bridge availability and liquidity when selecting chains. Polygon has the deepest liquidity for most ERC-20 tokens and the most established bridge ecosystem, making it easier to move capital in and out. Arbitrum and Optimism have strong but slightly less mature liquidity in some token pairs. For a team whose capital sources or counterparties are concentrated on specific chains, bridge availability should influence the decision at least as much as gas cost.

Practical workflow and cost estimation framework

To estimate actual multisig costs for a specific use case, teams should model their transaction pattern and signature requirements. Assume an average operation costs 150,000 to 200,000 gas including proposal, approvals, and execution for a 3-of-5 multisig. For a 5-of-9 multisig, add 100,000 to 150,000 gas per additional approval. Multiply by the monthly transaction volume to get a monthly gas cost estimate. Then factor in bridge costs: if moving capital between chains, assume 0.2% to 0.5% of the amount transferred.

For example, a DAO with a 3-of-7 multisig executing 10 treasury transactions per month on Arbitrum would pay approximately 2 million gas per month (200,000 gas per transaction). At 0.25 gwei per gas, that’s 0.5 ETH per month, or roughly $1,000 per month at current prices. The same DAO on Ethereum mainnet at 50 gwei per gas would pay 100 ETH per month, or approximately $200,000 per month. Clearly, the chain selection carries enormous operational consequences.

Team size also influences cost. A small multisig with 2-of-3 signers costs roughly 50% less gas than a 3-of-7 multisig because each transaction requires fewer signature verifications. As organizations grow and add signers for distributed governance, per-transaction costs increase, making lower-cost EVM-compatible networks more valuable. The counterintuitive result is that large, decentralized organizations benefit most from chain optimization, even though they often operate on higher-security networks like Ethereum mainnet for other reasons.

Future optimization: Protocol updates and cross-chain standards

Safe Wallet continues to evolve with improvements to signature aggregation, batch optimization, and cross-chain coordination. Recent updates have reduced approval costs by implementing signature compression and optimizing storage layouts, yielding 10% to 20% reductions in per-transaction gas for many operations. These incremental gains apply uniformly across all EVM-compatible networks, so a team’s relative chain comparison typically remains stable across Safe Wallet versions.

Cross-chain governance standards such as Connext and LayerZero may eventually reduce the operational overhead of managing multi-chain treasuries. Rather than executing separate governance decisions on each chain, teams might propose actions that automatically propagate across safe.global deployments on multiple EVM-compatible networks. However, these protocols add smart contract risk and reliance on cross-chain bridges, introducing new failure modes that teams must evaluate carefully.

For now, teams evaluating Safe Wallet deployment should treat current gas costs and bridge economics as the primary variables. Chain selection will likely shift as EVM-compatible networks mature, rollup technology advances, and institutional custody requirements evolve. Teams that design their governance and treasury operations with architectural flexibility—avoiding hard dependencies on specific chains—can adjust their deployment strategy as conditions change.

The official Safe Wallet official site provides updated gas cost dashboards, deployment addresses, and integration guides for all supported EVM-compatible networks, allowing teams to verify current conditions before making final deployment decisions.