Send parallel transactions
This quide explains how to send multiple parallel transactions. Note that you don’t need to send parallel transactions for batching calls. This is for sending new transactions when, for example, there’s already a transaction in the mempool for a certain account.
Prerequisites
- An Alchemy API Key
- A Gas Manager policy
- A signer to own the account and sign messages
The 
nonceKey override must fit into a uint152!React
JavaScript
API
Required SDK version: ^v4.61.0
Use the useSendCalls hook and the nonceOverride capability parameter to send parallel userops. You can also use the usePrepareCalls hook to only prepare the operation for signing.
You’ll need both ALCHEMY_API_KEY and ALCHEMY_POLICY_ID environment variables set to follow along!