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Always verify contract addresses from official sources before interacting with them

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Contract Suite

Biconomy is versioning our smart contracts by groups. One “Suite” version contains many different versioned contracts within itself. The contracts being versioned are:
  • Nexus Account
  • Modular Execution Environment (MEE) K1 Validator (ERC-7579 Module)
  • Nexus Boostrap & Factory
  • Composability & Fusion Utils (Composable Storage, ETH Forwarder)

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Versions

What’s New:
  • New composability version - enables native token runtime injection
  • Sign EIP-712 Data Struct instead of blind Stx hash for the smart-account mode (Not supported by SDK yet, thus this version is marked Experimental)
  • New ERC-7702 Nexus accounts can be initialized via relayers
Smart contracts changes above underwent security audit.

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Nexus & MEE Validator

Contract NameContract Address
Nexus Implementation v1.3.00x00000099da5B22B6d0D64f966f7138e0c70FAf57
MEE K1 Validator v1.0.50x00000002987de8E966e1202534f018B028384eaC
Nexus Bootstrap v1.3.00x000000dD827476e7Ba18C12d0a754124Fe84d6f6
Nexus Account Factory0x0000009FD552C6c8D9F2F139b254Ec9b0C132360

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Composability & Utility

Contract NameContract Address
Comoposable Execution Module0x000000e0Ac0Bcd4Cbc716B152fecbA0F706d6605
Composable Storage0x0000000671eb337E12fe5dB0e788F32e1D71B183
ETH Forwarder0x000000Afe527A978Ecb761008Af475cfF04132a1
What’s New: K1 MEE module introduced - enables ERC-7702-delegated EOAs to own Nexus accounts

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Nexus & MEE Validator

Contract NameContract Address
Nexus Implementation v1.2.00x00000000383e8cBe298514674Ea60Ee1d1de50ac
MEE K1 Validator v1.0.30x0000000031ef4155C978d48a8A7d4EDba03b04fE
Nexus Bootstrap v1.2.10x0000003eDf18913c01cBc482C978bBD3D6E8ffA3
Nexus Account Factory0x0000006648ED9B2B842552BE63Af870bC74af837

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Composability & Utility

Contract NameContract Address
Composable Storage0x0000000671eb337E12fe5dB0e788F32e1D71B183
ETH Forwarder0x000000Afe527A978Ecb761008Af475cfF04132a1
Major release with Nexus 1.2.0, ERC-7702 support, and native composability

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Nexus & MEE

Contract NameContract Address
Nexus Implementation v1.2.00x000000004F43C49e93C970E84001853a70923B03
MEE K1 Validator v1.0.10x00000000d12897DDAdC2044614A9677B191A2d95
Nexus Bootstrap v1.2.10x00000000D3254452a909E4eeD47455Af7E27C289
Nexus Account Factory0x000000001D1D5004a02bAfAb9de2D6CE5b7B13de
MEE EntryPoint & Paymaster0xE854C84cD68fC434cB3B0042c29235D452cAD977

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Composability & Utility

Contract NameContract Address
Composable Storage0x0000000671eb337E12fe5dB0e788F32e1D71B183
ETH Forwarder0x000000Afe527A978Ecb761008Af475cfF04132a1
Compiled for EVM Paris (No PUSH0, no MCOPY, no TSTORE)

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Nexus & MEE

Contract NameContract Address
Nexus Implementation v1.0.20x000000001964d23C59962Fc7A912872EE8fB3b6A
MEE K1 Validator v1.0.30x00000000E894100bEcFc7c934Ab7aC8FBA08A44c
Nexus Bootstrap v1.0.00x000000c4781Be3349F81d341027fd7A4EdFa4Dd2
Nexus Account Factory0x0000000C8B6b3329cEa5d15C9d8C15F1f254ec3C

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Composability & Utility

Contract NameContract Address
Composability Module0x000000eff5C221A6bdB12381868307c9Db5eB462
Composable Storage0x0000002C2A3b6DA7dfa38AAcdD950097B30B108d
ETH Forwarder0x000000001f1c68bD5bF69aa1cCc1d429700D41Da
Added Nexus Account Factory at 0x000000903887EA36EBe051038287f49fD4A07733
Initial release - Requires manual installation of MEE K1 validator and Composability module
GitHub Release →

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Nexus & MEE

Contract NameContract Address
Nexus Implementation v1.0.20x000000aC74357BFEa72BBD0781833631F732cf19
MEE K1 Validator v1.0.10x00000000d12897DDAdC2044614A9677B191A2d95
Nexus Bootstrap v1.0.00x879fa30248eeb693dcCE3eA94a743622170a3658
Nexus Account Factory0x000000c3A93d2c5E02Cb053AC675665b1c4217F9
MEE EntryPoint & Paymaster0xE854C84cD68fC434cB3B0042c29235D452cAD977

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Composability & Utility

Contract NameContract Address
Composability Module0x00000004430bB055dB66eBef6Fe5Ee1DA9668B10
Composable Storage0x0000000671eb337E12fe5dB0e788F32e1D71B183
ETH Forwarder0x000000Afe527A978Ecb761008Af475cfF04132a1

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Nexus Audits

Cyfrin

Competition Audit

Zenith

Full Review

Pashov

2025 Review

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MEE Stack Audits

MEE Stack

Audited by Zenith
  • MEE EntryPoint
  • Node Paymaster
  • MEEK1 Validator

Composability Stack

Multiple Auditors

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Legacy Contracts

These contracts are deprecated. Use the latest version for new deployments.
Contract NameContract Address
Nexus Implementation0x000000008761E87F023f65c49DC9cb1C7EdFEaaf
K1 Validator0x0000002D6DB27c52E3C11c1Cf24072004AC75cBa
K1 Validator Factory0x00000024115AA990F0bAE0B6b0D5B8F68b684cd6
Account Factory0x000000226cada0d8b36034F5D5c06855F59F6F3A
Bootstrap0x000000F5b753Fdd20C5CA2D7c1210b3Ab1EA5903
EntryPoint V70x0000000071727de22e5e9d8baf0edac6f37da032

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Base & Optimism

Contract NameContract Address
Sponsorship Paymaster0x0000006087310897e0BFfcb3f0Ed3704f7146852
Token Paymaster0x00000000301515A5410e0d768aF4f53c416edf19

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Other Chains

Contract NameContract Address
Sponsorship Paymaster0x00000072a5F551D6E80b2f6ad4fB256A27841Bbc
Token Paymaster0x00000000301515A5410e0d768aF4f53c416edf19

Integration Support

Need help integrating these contracts? Check our integration guide for detailed instructions and code examples.