Onchain Execution: Gas Costs, AMM Liquidity, and Netting in Multi-Vault Rebalancing

Every rebalance in Orion has two cost components. First, vault managers pay gas: ETH burned to submit intents and settle the target portfolio onchain. Second, they pay liquidity cost: LP fees and price impact from routing portfolio flows through liquid venues.

For a manager deploying strategies on Orion, the relevant question is whether the infrastructure supports onchain portfolio management with competitive execution economics.

Two Components of Execution Cost

Gas is the cost of expressing a rebalance onchain, telling the protocol what the target portfolio should be. Liquidity cost is the cost of achieving it, moving assets through liquid venues to achieve the target exposure. Orion separates these cleanly: managers submit intents; the protocol handles settlement and routing through a curated investment universe.

Beside simplifying onchain execution, the separation is an economic design choice. Managers incur gas only at intent submission; settlement and routing are handled downstream by the protocol.

Gas Costs

Portfolio managers need a view of gas costs. That cost is not well represented by gas price alone. Dollar expense is the product of network congestion (gas price in gwei) and the ETH/USD rate at execution.

The chart below plots daily gas price, ETH/USD, and the resulting USD cost per million gas units.

The baseline regime is favorable: gas spends most of the sample at low levels, and even when ETH is elevated, the joint cost per gas unit remains manageable. As ethereum.org's 2026 builder overview notes, mainnet is no longer priced like a permanently congested chain, a structural change that matters for portfolio programs batching state transitions on L1 rather than routing operational logic to rollups by default.

Intent Submission as the Manager's Gas Boundary

On Orion, the manager-facing gas obligation is confined to intent submission: the Layer-1 call that expresses target weights across vaults. Settlement, routing, and swap execution occur downstream and do not appear as separate gas line items on the manager's side.

The chart below maps submission cost in USD against intent size, a proxy for rebalance complexity, with confidence intervals reflecting the impact of other variables.

Even at large intent sizes, submission cost remains in cents, not dollars. Cost rises with complexity, and the upper uncertainty band widens at scale, but the absolute level is negligible relative to vault NAV. For systematic rebalancing programs, Layer-1 gas does not bind rebalancing decisions.

The practical implication is that execution economics are dominated by liquidity, not by Layer-1 overhead.

Execution Through AMM Liquidity

Once intent is expressed, portfolio changes are executed through liquid venues in the investment universe. Here the cost structure is liquidity-driven: LP fees plus price impact against available depth, independent of the gas regime described above. In this section we focus on Uniswap v3 pools.

The chart below plots total execution cost as a percentage of trade size for each pool in the universe, from small notionals to ±$300k.

Two regimes define the execution surface:

• Low-notional flow: LP fees. At modest trade sizes, curves flatten onto their fee tiers. Total cost is dominated by the pool's LP fee, not by price impact.
• Large-notional flow: slippage. As notional increases, price impact convexifies and slippage becomes the binding cost.

The investment universe is curated for the first regime: pools with sufficient depth to keep typical rebalance flow on the fee floor, before slippage dominates.

Internal Netting and Capital Efficiency

A manager operating a single vault in isolation bears the full liquidity cost of every external rebalance leg. Orion's multi-vault architecture permits internal netting: when one vault increases exposure to an asset and another decreases it, offsetting flow is cancelled before reaching external markets.

This is the onchain analogue of dealer-market internalization: intermediaries first seek to offset heterogeneous order flows within their own books and only externalize residual inventory to the broader market. Francis-Staite (2022) formalizes the multi-portfolio analogue, internal rebalancing processes that allocate assets between books before external trading, while Barzykin et al. (2021) models the dealer case. On shared Orion infrastructure, portfolio managers rebalance against one another before reaching AMM liquidity, reducing transaction costs and preserving capital.

The chart below shows aggregate system execution cost at varying netting efficiencies: the fraction of gross flow offset internally before reaching external venues.

The vertical displacement between curves quantifies the capital-efficiency gain from shared infrastructure. At zero netting efficiency, the system pays full liquidity cost on gross flow. As internal offset increases, effective trade size against pool depth falls, and aggregate cost compresses toward a fraction of the isolated-vault level.

For portfolio managers, three implications follow:

1. Aggregate rebalance volume can grow without proportional execution drag, provided vaults under common management generate offsetting flow.
2. Netting keeps effective trade size in the fee-floor region even when gross program size would otherwise enter the slippage tail.
3. Multi-vault infrastructure converts correlated rebalancing needs into execution savings: the platform is structurally more capital-efficient than the sum of independently operated vaults.

Implications for Portfolio Managers

The four figures above describe a consistent execution cost structure:

Relative to independently wired vaults, the same onchain liquidity supports lower effective execution cost and a cleaner separation between expression (intent) and achievement (liquidity).

Conclusion

Onchain portfolio management carries two execution costs with distinct drivers and scaling properties.

For Orion managers, gas is confined to intent submission and remains immaterial across intent sizes and market conditions. Liquidity cost is pool and size-dependent, and competitive for deep onchain venues. Netting across vaults further compresses aggregate cost, improving the economics of multi-strategy deployment relative to isolated rebalancing.

References

• Francis-Staite, K. (2022). Multi-portfolio internal rebalancing processes: Linking resource allocation models and biproportional matrix techniques to portfolio management. arXiv:2201.06183.
• Barzykin, A., Bergault, P., & Guéant, O. (2021). Algorithmic market making in dealer markets with hedging and market impact. arXiv:2106.06974.
• Uniswap Labs. Uniswap v3 Core.