Turnkey expands Monad and Optimism support (TX management, gas sponsorship, balances)

Today Turnkey announces expanded infrastructure support for Monad and Optimism, including balances, transaction management, and gas sponsorship. 

For teams already building with Turnkey, adding either of these networks requires only a one-line configuration change. There is no new SDK to integrate, RPC provider to manage, or chain-specific transaction logic to build.

Both networks now work with the same Turnkey infrastructure used to construct, sign, broadcast, and track transactions across supported chains. Teams can retrieve real-time balances and receive webhook updates without operating their own indexing infrastructure. 

As an additional option, they can enable gas sponsorship allowing them to cover user’s network fees in order to give their users a better transactional experience without any friction that gas payments might introduce.  

Why Turnkey is adding Monad and Optimism right now

Monad and Optimism represent two distinct parts of the EVM ecosystem.

Monad is a parallelized Layer 1 designed to deliver high throughput and fast finality while preserving EVM compatibility. Since reaching public mainnet in November 2025, it has attracted DeFi, gaming, payments, and consumer applications that need transactions to move quickly at scale.

Optimism is an established Ethereum Layer 2 that combines lower fees with settlement to Ethereum. OP Mainnet also anchors the OP Stack and the broader Superchain ecosystem, which includes networks such as Base, Zora, and World Chain.

Together, Monad and Optimism expand Turnkey support across both an emerging high-performance Layer 1 and one of Ethereum’s most established Layer 2 ecosystems.

Turnkey support gives these teams the infrastructure to create embedded wallets, orchestrate payments, sponsor gas, and power automated or agentic transaction flows.

Manage the complete EVM transaction lifecycle from day one

Turnkey’s transaction stack handles the complete lifecycle of an EVM transaction, including:

• Transaction construction
• Gas and priority fee estimation
• Secure signing
• Transaction broadcast

The same flow supports token transfers, smart contract interactions, contract deployments, and other arbitrary EVM operations.

Turnkey also manages broadcast reliability and fee estimation when networks become congested, helping applications submit transactions efficiently without building and maintaining their own transaction delivery infrastructure.

Remove native token requirements with built-in gas sponsorship

Applications can enable gas sponsorship with a single parameter, allowing users to transact without holding the network’s native gas token. 

Teams can manage sponsored spending through USD-denominated limits at two levels:

• A total limit for the organization
• Individual limits for each sub-organization

Limits and time windows can be configured in the Turnkey dashboard, while current usage can be checked programmatically against the active limit.

Track wallet balances and transaction activity in real time

Transaction execution is only part of the application experience. Teams also need an accurate view of what each wallet holds and when those balances change.

Turnkey’s Balances API returns the assets held by any Turnkey-secured address on a supported network. Balance webhooks then push updates as funds move in real-time, removing the need to operate an indexer or continuously poll the chain.

Webhooks can notify applications when a balance change is first detected onchain and again when it reaches finality. This makes it possible to show users a pending state immediately, then confirm the transaction once it has finalized.

Enforce transaction controls at the point of signing

Every transaction on Monad and Optimism can also be governed by Turnkey’s policy engine.

Policies can define:

• How much a wallet can spend
• Which addresses can receive funds
• Which contracts a wallet can interact with
• Who can approve sensitive transactions
• Which actions an automated system or agent can perform

Private key operations and policy evaluation happen inside hardware-isolated Trusted Execution Environments. This keeps the keys and the rules governing their use within the same secure boundary.

If a transaction falls outside the approved policy, Turnkey denies the request before a signature is created. These controls remain enforced even if the application’s surrounding infrastructure is compromised.

Start building on Monad and Optimism with Turnkey

Teams already using Turnkey can now extend their existing transaction flows to Monad or Optimism without rebuilding their wallet infrastructure or adding chain-specific transaction logic. The same APIs, policies, and transaction infrastructure already supporting your application can now support both networks.

Explore the transaction management and balances documentation and learn how to use Turnkey to simplify your transaction lifecycle, from construction to secure signing.

Whether you are launching on a new network or expanding an existing multichain application, Turnkey gives you one infrastructure layer for secure transaction execution across hundreds of chains. 

Start building with Turnkey today.

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