zkSync Era Precompile Integration Guide

introduction

Precompile Integration on zkSync Era

Introduction

A living reference for developers integrating newly activated cryptographic precompiles on zkSync Era.

zkSync Era extends the standard EVM precompile set with additional elliptic curve and hashing operations to support advanced cryptographic use cases. This page tracks newly activated precompiles, their addresses, gas schedules, and the specific cryptographic primitives they expose. For protocol teams and library developers, each new precompile represents a shift in the cost and feasibility of on-chain operations like signature verification, zero-knowledge proof validation, and identity-based systems.

Integrating a new precompile requires more than a simple address call. Developers must understand the exact input encoding, the gas metering model—which on zkSync Era is state-diff based rather than purely opcode-priced—and the behavioral differences from equivalent EVM precompiles. A precompile that is cheap on Ethereum may have a different cost profile on zkSync Era due to the underlying circuit constraints and proof generation overhead. Calling patterns that are gas-efficient in Solidity may need to be restructured in Yul to minimize state diffs and reduce overall transaction cost.

This guide provides secure, tested calling patterns from both Solidity and Yul, benchmarks gas consumption for common operations, and flags integration risks such as silent failure modes or malformed input handling. Teams deploying contracts that depend on these precompiles should conduct a precompile integration review to verify correct encoding, gas budgeting, and fallback behavior. Chainscore Labs can perform targeted audits of precompile-dependent contract logic and gas profiling to ensure deployments are both secure and cost-optimized.

NEW PRECOMPILE INTEGRATION AND USAGE PATTERNS

Precompile Quick Facts

A quick-reference table for protocol teams and library developers evaluating the operational impact of newly activated precompiles on zkSync Era.

Area	What changes	Who is affected	Action
Address Assignment	A new precompile is assigned a specific address, potentially colliding with a known address on Ethereum mainnet.	Smart contract developers, library maintainers	Verify the canonical address against the latest ZIP and system contract release. Do not assume mainnet equivalence.
Gas Metering	The precompile introduces a new gas cost model that differs from standard EVM opcodes, based on circuit complexity.	Wallet teams, dApp developers, paymaster operators	Update gas estimation logic to account for the precompile's specific cost function. Benchmark against state-diff based pricing.
Circuit Compatibility	The precompile's underlying circuit is added to the prover, requiring an update to the ZK Stack's cryptographic backend.	Prover operators, ZK Stack integrators	Ensure the prover version supports the new circuit before the activation block. Monitor for proof generation failures.
Solidity Interface	A new interface or library is required to call the precompile via `staticcall` from Solidity, with specific input encoding.	Smart contract developers, security auditors	Use the canonical interface from the zkSync Era documentation. Review input encoding for off-by-one errors and ABI mismatches.
Yul/Assembly Usage	Calling the precompile from Yul or inline assembly requires specific memory layout and gas stipend handling.	Protocol engineers, gas-optimization teams	Validate assembly blocks against the precompile's formal specification. Test for memory corruption and out-of-gas scenarios.
L1-L2 Bridge Interaction	A precompile used in a bridge context (e.g., for message verification) may alter the trust assumptions of the canonical bridge.	Bridge operators, cross-chain dApp teams	Review the precompile's role in the bridge's proof verification. Assess if a new trust assumption is introduced.
Indexing and Analytics	Calls to the new precompile generate specific traces and events that indexing pipelines must decode.	Data teams, block explorer operators	Update ETL pipelines to parse and label precompile calls. Verify trace decoding for nested `staticcall` contexts.
Security Review	A new cryptographic precompile expands the attack surface for integration-level vulnerabilities.	Security auditors, risk teams	Conduct a focused review of contracts interacting with the precompile, paying attention to input validation, replay risks, and error handling.

technical-context

PRECOMPILE INTEGRATION

Technical Mechanism and Calling Architecture

How new precompiles are activated on zkSync Era and the secure, gas-efficient calling patterns for developers.

New precompiles on zkSync Era are activated through system contract upgrades, typically as part of a scheduled network upgrade or a specific ZIP (ZKsync Improvement Proposal). Unlike Ethereum, where precompiles are defined at the protocol level and activated via hard forks, zkSync Era's zkEVM implements precompiled contracts at designated addresses within the system contract space. The activation is governed by the ZKsync governance system, with the Security Council and Guardians holding the authority to execute the upgrade that deploys or activates a new precompile contract. Developers must monitor ZIPs and the SystemContractHelper interface for new precompile addresses and ABI definitions.

Calling a precompile from a high-level language like Solidity or Yul requires strict adherence to the staticcall convention. Precompiles are read-only and do not modify state; any attempt to use call or delegatecall will revert. The standard integration pattern involves using a Solidity interface or a low-level staticcall assembly block, forwarding the exact ABI-encoded input and decoding the returned bytes. For gas optimization, developers should benchmark the precompile's cost against equivalent EVM implementations, as zkSync Era's state-diff based pricing model charges for the computational cost of the precompile's circuit execution, which can differ significantly from Ethereum's fixed precompile gas schedules.

Protocol teams integrating new cryptographic precompiles, such as those for P256 or secp256r1 curve operations, must also consider the broader system contract context. The ContractDeployer and NonceHolder system contracts do not interact with precompiles directly, but factory contracts that deploy new account abstractions may use precompiles for signature validation within the IAccount interface. A security review of the calling pattern is critical to prevent edge cases where a failed precompile call is not correctly handled, potentially leading to a locked account or a denial-of-service vector. Chainscore Labs provides precompile integration review and gas benchmarking to ensure secure and cost-effective usage.

NEW PRECOMPILE INTEGRATION

Affected Actors and Impact

Core Impact

New precompiles alter the cost and security model for on-chain cryptographic operations. Teams maintaining ECDSA, BLS, or hash-based libraries must decide whether to migrate internal functions to native precompiles or maintain fallback paths for environments where the precompile is not yet active.

Required Actions

Benchmark new precompile gas costs against existing Solidity/Yul implementations.
Update library interfaces to accept precompile addresses as configurable parameters.
Verify that precompile call patterns do not introduce silent reverts on older blocks.
Audit interaction between precompile calls and the state-diff gas model.

Chainscore Labs can perform gas benchmarking and integration review for library upgrades targeting new precompiles.

implementation-impact

PRECOMPILE ADOPTION LIFECYCLE

Integration Workflow and Patterns

A structured workflow for integrating newly activated precompiles on zkSync Era, from discovery and gas benchmarking to secure implementation and production monitoring.

Precompile Discovery and Capability Assessment

Monitor canonical ZIPs and the zkSync system contract repository for new precompile addresses. Verify the exact ABI, gas schedule, and supported elliptic curves or hash functions against the formal specification. Do not assume behavioral parity with Ethereum mainnet precompiles; zkEVM implementations may differ in edge-case handling or input validation. Library developers should abstract precompile calls behind a versioned interface to simplify future migrations.

Secure Calling Patterns in Solidity and Yul

Use staticcall for precompiles that perform pure computation to prevent unexpected state modifications. In Yul, validate the return data size before decoding to avoid out-of-bounds access. For precompiles with variable gas costs, implement a gas buffer to prevent out-of-gas reverts during high-computation inputs. Always validate precompile return values; a successful call does not guarantee a valid cryptographic result. Chainscore can review your integration for these failure modes.

Gas Benchmarking and State-Diff Cost Modeling

New precompiles introduce unique gas profiles that interact with zkSync Era's state-diff based pricing model. Benchmark precompile calls across a range of input sizes to map the relationship between computational cost and L2 gas charged. Account for the pubdata cost if precompile results are emitted in event logs or stored in state. Teams should build a cost model before integrating precompiles into high-throughput dApps to avoid unpredictable transaction fees.

Cross-Compiler Compatibility Verification

Test precompile integration across both zksolc and solc compilation paths if your codebase targets multi-chain deployment. Inline assembly wrappers for precompiles may behave differently under the LLVM-IR pipeline. Verify that the precompile address is correctly resolved and that the staticcall gas forwarding logic is preserved. Chainscore provides cross-compiler compatibility audits for teams deploying precompile-dependent libraries on zkSync Era.

Account Abstraction Interaction Testing

Precompile calls originating from custom account contracts (IAccount) or paymasters execute in a constrained context. Test that precompile gas consumption is correctly accounted for in the validation phase, where the gas limit is strictly bounded. Ensure paymaster postOp logic does not inadvertently rely on precompile return data that may be invalidated by the outer transaction context. Wallet and paymaster teams need AA-specific precompile integration testing.

Production Monitoring and Circuit Upgrade Readiness

Monitor the ZK Stack prover releases for circuit changes that may alter precompile gas costs or supported curves. Set up alerts on precompile call reverts and unexpected gas spikes in production. Maintain a registry of deployed contracts that depend on specific precompile versions. Chainscore can help establish a monitoring framework and upgrade readiness plan for protocol teams with critical precompile dependencies.

NEW PRECOMPILE ADOPTION

Integration Risk Matrix

Evaluates the integration risks, affected actors, and required actions when a new cryptographic precompile is activated on zkSync Era.

Area	What changes	Who is affected	Action
Gas Cost Model	New precompile introduces a fixed gas cost that may be cheaper or more expensive than an equivalent EVM or Yul implementation.	dApp developers, wallet teams	Benchmark gas costs against existing Solidity/Yul libraries and update gas estimation logic.
Contract Bytecode	Contracts using the new precompile become incompatible with other EVM chains and older zkSync Era versions.	Multi-chain dApp teams, library developers	Implement version-gated compilation or deploy separate contract instances for zkSync Era.
Compiler Support	The `zksolc` compiler requires an update to recognize the new precompile address and generate correct call semantics.	CI/CD pipeline maintainers, security auditors	Update to the minimum required `zksolc` version and re-verify all dependent contracts.
Address Collision	The precompile's address could collide with a previously deployed contract on zkSync Era.	Protocol architects, deployment tooling teams	Audit the precompile address space against existing deployments and system contracts.
Audit Assumptions	Existing security audits may assume a specific gas profile or execution context that the precompile alters.	Security auditors, protocol risk teams	Trigger a targeted re-audit of any contract path that will integrate the new precompile.
Wallet Integration	Wallets must correctly simulate and display transactions interacting with the new precompile address.	Wallet developers, transaction simulation services	Update simulation engines to recognize the precompile and display a human-readable transaction description.
Indexing and Analytics	Indexers must decode calls to the new precompile address to provide meaningful analytics and event data.	Data teams, block explorer operators	Update ETL pipelines and ABI decoders to parse precompile interactions correctly.
Bridge and L1 Messaging	Using a new precompile in an L1→L2 transaction context may have undocumented gas or execution limits.	Bridge operators, cross-chain dApp teams	Verify the precompile's behavior within the `requestL2Transaction` execution context against canonical tests.

PRECOMPILE READINESS

Developer Integration Checklist

A practical checklist for protocol teams and library developers integrating newly activated precompiles on zkSync Era. Each item identifies a critical verification step, the operational risk it mitigates, and the signal that confirms readiness for production deployment.

Confirm that the target precompile is active on the specific zkSync Era network you are deploying to (mainnet, testnet, or local node). Precompile addresses and activation blocks can differ from Ethereum mainnet.

What to check: Query the canonical precompile address against the zkSync Era system contract registry or the official ZK Stack specification for the current protocol version.
Why it matters: Calling an inactive or incorrect address will either revert silently or execute unintended fallback logic, potentially causing fund loss or state corruption.
Readiness signal: A test call to the precompile with known inputs returns the expected output and does not revert.

resource-links

ZKSYNC ERA PRECOMPILE INTEGRATION

Canonical Resources

Canonical resources for teams integrating newly available zkSync Era precompiles. Use these sources to verify activation status, address-level behavior, compiler assumptions, and production transaction evidence before shipping Solidity, Yul, wallet, bridge, or library changes.

ZKsync Official Documentation

Start with the ZKsync documentation before assuming Ethereum mainnet precompile behavior carries over unchanged. For new precompile integration, teams should verify the documented address, supported input format, return-data behavior, revert semantics, gas accounting, and any Era-specific differences caused by the bootloader, system contracts, or zkEVM execution model. Treat the docs as the integration baseline, but still confirm the current network status against releases and live RPC behavior before enabling production code paths.

EXPLORE

Era System Contracts Source

Review the system contract repository when precompile usage depends on low-level execution rules, account abstraction validation, deployment behavior, or system-level address handling. Library teams should inspect constants, interfaces, tests, and upgrade history rather than relying only on wrapper examples. This is especially important for Solidity libraries that expose precompile helpers, Yul call shims, cryptographic verification modules, or factory contracts that may be sensitive to calldata layout and return-size assumptions.

EXPLORE

ZKsync Era Node and Protocol Repository

Use the Era repository to correlate documentation with protocol implementation, node releases, VM behavior, and issue history. For precompile rollouts, operators and protocol teams should check release notes, implementation changes, and open issues that may affect local testing, RPC simulation, tracing, or gas estimation. This source is also useful for infrastructure teams validating whether external nodes, indexers, or private testing environments are running code compatible with the precompile behavior expected by deployed contracts.

EXPLORE

zksolc Compiler Source and Releases

Precompile integrations often use inline assembly, staticcall, custom ABI packing, or cryptographic library code that was originally written for solc on Ethereum mainnet. Check the zksolc compiler source and releases for supported Solidity versions, optimizer behavior, assembly limitations, and known compatibility differences. Before migrating a library, compile representative fixtures with the exact zksolc version used in production and compare bytecode, deployment artifacts, gas estimates, and revert paths against expected behavior.

EXPLORE

Ethereum EIP Baselines for Shared Precompiles

When zkSync Era exposes a precompile intended to be compatible with an Ethereum precompile, use the relevant Ethereum EIP as the semantic baseline for input encoding, edge cases, and expected outputs. Do not treat the EIP as proof of Era activation or identical gas cost. Instead, pair EIP test vectors with zkSync-specific execution tests, especially for elliptic-curve operations, hashing primitives, modular exponentiation, and signature-verification libraries used by bridges, wallets, account contracts, and ZK-verifier integrations.

EXPLORE

ZKsync Era Explorer for Live Transaction Verification

After local and testnet validation, verify production calls through the zkSync Era explorer and RPC traces where available. Teams should confirm that deployed contracts call the intended precompile address, consume expected gas, return expected data, and emit downstream events consistently. This is useful for monitoring staged rollouts of cryptographic libraries, wallet account validation logic, paymaster verification paths, bridge proof checks, and any integration where a silent precompile mismatch could cause stuck funds or failed user transactions.

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PRECOMPILE INTEGRATION

Frequently Asked Questions

Common questions from protocol teams and library developers integrating newly activated precompiles on zkSync Era.

Do not rely on static address lists. Query the system contract that governs precompile availability or check the protocol upgrade's ZIP specification for the activation gate.

What to check:

The canonical PRECOMPILE_IMPLEMENTATION address for the target operation.
Whether the precompile is gated behind a protocol version check in the ContractDeployer or SystemContext.

Why it matters: Calling an inactive or future precompile address will revert or return unexpected data, leading to silent failures in production.

Readiness signal: A successful staticcall to the precompile address on the target network (testnet first) with a known input vector that returns the expected output.

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New Precompile Integration and Usage Patterns

Introduction

Precompile Quick Facts

Technical Mechanism and Calling Architecture

Affected Actors and Impact

Core Impact

Required Actions

Integration Workflow and Patterns

Precompile Discovery and Capability Assessment

Secure Calling Patterns in Solidity and Yul

Gas Benchmarking and State-Diff Cost Modeling