ERC-4337 Account Abstraction on Mantle: Deployment Guide

introduction

ERC-4337 ON MANTLE

Introduction

A technical guide to deploying and operating ERC-4337 smart accounts on Mantle, covering entry point contracts, bundler configurations, and the unique L2 fee model.

Deploying ERC-4337 account abstraction on Mantle requires more than copying an Ethereum mainnet configuration. While the core EntryPoint contract and UserOperation structure remain standard, the operational environment diverges sharply. The most critical difference is Mantle's fee model, which separates the L2 execution cost from the L1 data availability fee paid to EigenDA. A UserOperation that correctly funds gas on a standard L2 may fail on Mantle if the verificationGasLimit and callGasLimit do not account for the dynamic, often significant, L1 data posting cost that the bundler must cover.

This implementation pattern demands that bundler endpoints be configured to accurately estimate Mantle's preVerificationGas, which must include the cost of publishing the compressed UserOperation data to EigenDA. Paymaster policies for gas sponsorship become more complex, as they must decide whether to sponsor only L2 execution or also the variable L1 data fee. For wallet and dApp developers, the primary operational risk is a transaction simulation succeeding locally but failing on-chain because the bundler's on-chain gas estimation, which queries the L1Block precompile for the current data fee, returns a higher value than the user's static estimate.

A Chainscore implementation review for ERC-4337 on Mantle focuses on this fee-model integration. We audit the bundler's gas estimation logic against the GasPriceOracle precompile, validate paymaster sponsor policies for edge cases during EigenDA fee spikes, and ensure that account factories are compatible with Mantle's address aliasing rules when interacting with L1 contracts. The goal is to prevent the silent transaction failures and unexpected gas costs that are the most common failure modes for account abstraction deployments on modular L2s.

DEPLOYMENT AND OPERATIONAL CONSIDERATIONS

Quick Facts: ERC-4337 on Mantle

Key facts for teams deploying or integrating ERC-4337 smart accounts on Mantle, covering entry point contracts, bundler configuration, paymaster policies, and L2-specific fee handling within UserOperations.

Area	What changes	Who is affected	Action
Entry Point Contract	Requires a canonical EntryPoint deployment on Mantle. The address and version must match the audited, standard contract.	Wallet devs, dApps, bundler operators	Verify the deployed EntryPoint address against the canonical ERC-4337 repository and Mantle's official documentation.
Bundler Endpoint	Bundlers must be configured with a Mantle RPC endpoint that supports `eth_sendUserOperation` and related debug/tracing methods.	Bundler operators, infrastructure teams	Confirm your bundler client is compatible with Mantle's OP Stack-derived RPC and can reliably submit transactions.
Paymaster Gas Policies	Paymasters must account for Mantle's dynamic L2 execution fee plus the L1 data fee for posting to EigenDA, which can cause variable gas costs.	Paymaster operators, app developers	Implement off-chain gas estimation that simulates the full UserOperation cost on Mantle before sponsorship to prevent paymaster insolvency.
UserOperation Fee Model	UserOperations on Mantle must correctly estimate `preVerificationGas`, `verificationGasLimit`, and `callGasLimit` using L2-specific fee logic.	Wallet SDKs, account factories	Update gas estimation logic to call `eth_estimateUserOperationGas` on a Mantle bundler, not a generic Ethereum node.
Account Factory Deployment	A canonical account factory must be deployed on Mantle for deterministic smart account creation. The factory address may differ from Ethereum mainnet.	Wallet providers, SDK developers	Deploy or verify the canonical factory address on Mantle and hardcode it in your SDK to prevent counterfactual address mismatches.
Signature Aggregation	Mantle's precompile support may enable gas-efficient signature aggregation (e.g., BLS) within the EntryPoint's `handleAggregatedOps`.	Account implementers, bundler operators	Audit any custom aggregator contracts for correct interaction with Mantle-specific precompiles and gas schedules.
State Override and Debugging	Bundlers and wallets rely on `eth_call` with state overrides for simulation. Mantle's RPC must support this for accurate gas and validation checks.	Infrastructure providers, wallet devs	Test state override functionality on your Mantle RPC provider to ensure reliable UserOperation simulation.
Chainscore Review	A full-stack review of your ERC-4337 deployment on Mantle can identify risks in paymaster economics, bundler configuration, and account factory security.	Protocol teams, wallet providers, dApps	Contact Chainscore Labs for an implementation review of your smart account, paymaster, and bundler setup on Mantle.

technical-context

L2 GAS ACCOUNTING FOR ERC-4337

The Mantle Fee Model and UserOperations

How Mantle's L2 execution fee and L1 EigenDA data fee interact with ERC-4337 UserOperation gas fields, and what bundlers and paymasters must validate.

Mantle's fee model diverges from the standard OP Stack by replacing the L1 data fee for Ethereum calldata with a fee for posting transaction data to EigenDA. For ERC-4337 account abstraction, this means a UserOperation must account for two distinct cost vectors: the L2 execution gas used by the smart account and the L1-equivalent data gas charged for DA publication. Bundlers operating on Mantle cannot simply reuse Ethereum Mainnet gas estimation logic; they must simulate the UserOperation against Mantle's specific GasPriceOracle precompile to decompose the total fee into its execution and DA components.

The critical operational risk lies in the preVerificationGas, verificationGasLimit, and callGasLimit fields of a UserOperation. On Mantle, the preVerificationGas must cover the bundler's cost to submit the underlying transaction, which includes the dynamic EigenDA data fee. If a paymaster sponsors this transaction, its postOp logic must be robust against the variable DA cost, which can spike independently of L2 execution gas. A paymaster that naively accepts a fixed gas limit without checking the current L1 data fee from the oracle risks insolvency during periods of high DA demand. Similarly, a bundler's eth_call simulation must use Mantle's l1DataFee opcode behavior to accurately predict the final cost and avoid including UserOperations that will revert due to insufficient preVerificationGas.

For teams deploying smart accounts, paymasters, or bundlers on Mantle, a Chainscore Labs protocol impact assessment can validate that gas accounting logic correctly integrates with Mantle's GasPriceOracle precompile. An upgrade readiness review can model paymaster solvency under extreme DA fee scenarios, ensuring that sponsored transactions remain reliable during network congestion.

ERC-4337 DEPLOYMENT IMPACT

Affected Actors and Systems

dApp Developers

Integrating ERC-4337 on Mantle requires developers to adapt their frontend and contract logic to interact with smart accounts rather than EOAs. This means using UserOperation objects instead of standard transactions.

Key Actions:

Update dApp interfaces to detect and support smart accounts via eth_sendUserOperation.
Implement paymaster policies if sponsoring gas for users, accounting for Mantle's L2 fee model which includes an L1 data fee for EigenDA posting.
Test contract access control lists (ACLs) to ensure they don't inadvertently block smart accounts, which have dynamic addresses.
Verify signature validation logic against the specific entry point contract version deployed on Mantle.

Chainscore can review your smart account interaction layer to prevent compatibility breaks and optimize gas sponsorship logic for the Mantle fee environment.

implementation-impact

ERC-4337 DEPLOYMENT CHECKLIST

Implementation and Integration Impact

Deploying ERC-4337 smart accounts on Mantle requires careful handling of the L2 fee model, EigenDA data costs, and bundler endpoint reliability. Teams must validate paymaster policies, entry point contracts, and UserOperation gas parameters against Mantle's specific execution environment.

Entry Point Contract Verification

Confirm the canonical EntryPoint contract address deployed on Mantle matches the audited version from the ERC-4337 reference implementation. Using an unverified or forked entry point can lead to silent signature validation failures or fund loss. Chainscore Labs can audit your account factory's interaction with the entry point to ensure compliance with Mantle's execution context.

EXPLORE

Bundler Endpoint Configuration

Select a bundler endpoint that reliably submits UserOperations to Mantle's sequencer. Evaluate bundler latency, gas price markup policies, and support for eth_sendUserOperation with Mantle's specific RPC quirks. Teams should implement a fallback bundler strategy to prevent transaction censorship during periods of high network load or sequencer congestion.

Paymaster Gas Sponsorship Policies

Design paymaster policies that account for Mantle's L2 execution fee plus the L1 data fee for EigenDA blob posting. A paymaster that only sponsors the L2 execution fee will cause UserOperations to revert when the L1 data fee is non-trivial. Implement a dynamic sponsorship cap that queries the current L1 data fee from the GasPriceOracle precompile before signing.

UserOperation Gas Parameter Estimation

Adjust preVerificationGas, verificationGasLimit, and callGasLimit values for Mantle's gas schedule, which may differ from Ethereum mainnet due to precompile pricing and execution client optimizations. Incorrect gas limits cause bundler rejection or on-chain reverts. Use eth_estimateUserOperationGas against a Mantle-specific bundler to calibrate parameters before mainnet deployment.

Signature Aggregation and DA Cost Trade-offs

Evaluate whether to use signature aggregation schemes like BLS to reduce calldata size and lower EigenDA posting costs. While aggregation reduces the per-UserOperation L1 data fee, it introduces complexity in key management and may not be supported by all bundlers. Chainscore Labs can model the cost break-even point for your expected transaction volume.

Account Factory Upgradeability and Governance

Define a secure upgrade path for your smart account factory on Mantle. If using a proxy pattern, ensure the implementation contract is verified on the Mantle explorer and that the upgrade key is protected by a multi-sig or governance timelock. An ungoverned upgrade key is a critical risk vector that can drain all user accounts in the factory.

SMART ACCOUNT AND BUNDLER RISK ASSESSMENT

Risk Matrix for ERC-4337 Deployments

Identifies operational, economic, and compatibility risks for teams deploying ERC-4337 smart accounts, bundlers, and paymasters on Mantle. Helps operators, wallet developers, and DeFi protocols evaluate failure modes and required mitigations.

Risk	Failure mode	Severity	Mitigation
Entry Point Contract Mismatch	Deploying to an unsupported or unverified Entry Point version causes UserOperations to revert silently. Bundlers may reject operations targeting unknown contracts.	High	Verify the canonical Entry Point address against the official Mantle deployment registry. Chainscore can audit the deployment configuration and initialization parameters.
Bundler L2 Fee Undercalculation	The bundler fails to accurately estimate the L1 data fee component for posting to EigenDA, resulting in unprofitable or stuck UserOperations that drain the bundler's balance.	High	Implement a dynamic gas estimation oracle that queries the L1 data fee from the Mantle gas oracle contract. Chainscore can review the bundler's fee logic and economic sustainability model.
Paymaster L1 Fee Volatility	A sponsoring paymaster's deposit is exhausted due to a spike in L1 data costs, causing all sponsored UserOperations to fail and breaking dApp UX for gasless transactions.	Medium	Monitor the paymaster deposit balance with automated top-up alerts. Set a conservative staked MNT buffer above expected operational costs. Chainscore can design a monitoring and alerting system for paymaster solvency.
Aliased Address Validation Bypass	A smart account's `validateUserOp` function checks `msg.sender` without accounting for the aliased bundler address, allowing an unauthorized actor to craft a malicious UserOperation.	Critical	Always validate the sender using the canonical `EntryPoint.getSenderAddress()` or by applying the aliasing offset. Chainscore can perform a security review of the account's validation logic.
Bundler Centralization and Censorship	A single dominant bundler or a small set of permissioned bundlers can censor specific UserOperations, undermining the censorship-resistance guarantees of the mempool.	High	Encourage a competitive bundler market. dApps should monitor for transaction inclusion delays and allow users to submit through alternative bundlers. Chainscore can assess the bundler network's decentralization and failure tolerance.
Paymaster Reputation Blacklisting	A paymaster is blacklisted by bundlers due to a high rate of failed post-op checks or suspected griefing, preventing all associated accounts from using gas sponsorship.	Medium	Implement rigorous off-chain simulation of the full UserOperation lifecycle before submission. Maintain a positive reputation score by ensuring deterministic post-op behavior. Chainscore can audit the paymaster's reputation management strategy.
Smart Account Upgradeability Risk	A compromised upgrade key for a proxy-based smart account allows an attacker to drain all user funds or lock accounts permanently.	Critical	Use a decentralized governance process or a timelock for upgrades. Consider non-upgradeable, immutable account implementations for high-value users. Chainscore can review the upgrade governance and key management architecture.
Cross-Layer Replay Attack	A UserOperation signed for Mantle is replayed on an OP Stack fork or another chain sharing the same chain ID, leading to unintended state changes.	Medium	Embed the chain ID and a domain separator in the UserOperation hash. Ensure the Entry Point contract's domain includes the chain ID. Chainscore can verify the cross-chain replay protection implementation.

ERC-4337 INFRASTRUCTURE READINESS

Bundler and Paymaster Operator Checklist

A technical checklist for teams operating bundlers or paymasters on Mantle. This guide addresses L2-specific fee mechanics, DA cost volatility, and precompile interactions that must be validated before processing UserOperations in production.

Confirm that the canonical ERC-4337 EntryPoint contract is deployed at the expected address on Mantle and that your bundler is configured to send handleOps transactions exclusively to this address. Verify the SenderCreator factory address if your service deploys counterfactual accounts.

Why it matters: Using an incorrect or unverified EntryPoint can lead to permanently reverted UserOperations or, in a worst-case scenario, fund drainage if a malicious contract is invoked.

Readiness signal: Your bundler's configuration file explicitly sets the EntryPoint address, and an automated startup check queries the MANTLE_ENTRYPOINT address via eth_getCode to ensure it is a deployed contract.

resource-links

ERC-4337 REFERENCES

Canonical Resources

Use these resources to verify ERC-4337 behavior, EntryPoint compatibility, bundler assumptions, and Mantle-specific deployment details before operating smart accounts on Mantle.

ERC-4337 Specification

Start with the canonical ERC-4337 specification for the protocol model: UserOperation structure, EntryPoint responsibilities, sender validation, nonce handling, paymaster flow, aggregator hooks, and bundler interaction. For Mantle deployments, teams should map each spec requirement to the actual EntryPoint version they use and confirm that wallet, bundler, paymaster, and simulation code all agree on the same UserOperation encoding and validation semantics.

EXPLORE

eth-infinitism Account Abstraction Repository

The eth-infinitism repository is the primary implementation reference for ERC-4337 contracts and related tooling. Use it to inspect EntryPoint contract source, interfaces, test fixtures, deployment scripts, and release notes. Mantle integrators should not assume an EntryPoint address or version from another chain; verify deployed bytecode, supported interfaces, and bundler compatibility against the implementation version used by the Mantle account-abstraction stack.

EXPLORE

ERC-4337 Documentation

The ERC-4337 documentation provides operator-oriented guidance for bundlers, paymasters, smart account developers, and application teams. Use it to validate mempool assumptions, simulation requirements, gas accounting, reputation considerations, and paymaster risk controls. For Mantle, this guidance should be combined with L2 fee testing so sponsored transactions account for execution gas, data-related fees, RPC estimation behavior, and failure modes during UserOperation simulation.

EXPLORE

Mantle Developer Documentation

Mantle’s official documentation is the canonical starting point for chain-specific integration data, including network configuration, RPC access, bridge behavior, fee mechanics, and developer tooling. ERC-4337 teams should use Mantle documentation to confirm chain ID, RPC endpoints, explorer support, gas and fee display assumptions, and any L2 behavior that may affect UserOperation simulation, bundler inclusion, paymaster accounting, or wallet transaction construction.

EXPLORE

Mantle Explorer Verification

Before production launch, verify all account-abstraction contracts on the Mantle explorer: EntryPoint, account factory, account implementation, paymaster, staking or deposit-related contracts, and upgradeable proxy admin roles. Operators should compare verified source, bytecode, constructor arguments, proxy implementation slots, and event emission against their deployment manifest. This is especially important when exchanges, custodians, or dApps rely on deterministic smart account addresses.

EXPLORE

ERC-7562 Validation Rules

Bundlers and paymasters should track ERC-7562 because it defines validation-scope rules intended to make ERC-4337 mempool behavior safer and more interoperable. Even where adoption status varies by bundler or network, Mantle operators should test whether their smart account validation, paymaster logic, storage access patterns, and oracle reads are compatible with the rule set enforced by their chosen bundler infrastructure.

EXPLORE

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ERC-4337 ON MANTLE

Frequently Asked Questions

Common questions from teams deploying ERC-4337 smart accounts, bundlers, and paymasters on Mantle, with a focus on L2-specific fee logic, endpoint configuration, and operational readiness.

Verify the canonical EntryPoint address against the official Mantle contract registry or the ERC-4337 canonical deployment list. Using an unverified EntryPoint can lead to silent signature failures or fund loss.

What to check: Confirm the EntryPoint address and deployment transaction on Mantle's block explorer.
Why it matters: A mismatch causes UserOperation simulations and on-chain validation to fail, breaking all smart accounts.
Readiness signal: Your bundler's configuration references the exact, checksummed address deployed on Mantle, not an address from another OP Stack chain.

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Account Abstraction (ERC-4337) Deployment Patterns

Introduction

Quick Facts: ERC-4337 on Mantle

The Mantle Fee Model and UserOperations

Affected Actors and Systems

dApp Developers