Skip to main content
DA Builder’s architecture combines onchain contracts with off-chain services to aggregate transactions from multiple users into single onchain executions, reducing costs through shared overhead.

​
System Architecture

​
Component Responsibilities

​
User’s EOA with EIP-7702 Proposer Code

  • Contains the deployed proposer contract code (e.g., TrustlessProposer)
  • Validates signatures and executes authorized transactions
  • Signs transactions to be submitted to DA Builder

​
DA Builder Service

  • Accepts transaction submissions from users
  • Validates EIP-7702 setup and account funding
  • Collects multiple user transactions
  • Manages transaction ordering and batching
  • Returns transaction IDs for tracking

​
ProposerMulticall Contract

  • Executes the aggregated transaction onchain
  • Calls each user’s proposer contract in sequence

​
GasTank Contract

  • Stores user deposits to cover their respective transaction fees
  • Provides balance tracking

​
L2 Rollup Inbox (Example Use Case)

  • Receives the actual user transaction
  • Processes it according to L2 protocol rules
  • Updates L2 state based on transaction execution
Note: The L2 Rollup Inbox is shown as an example use case. DA Builder can aggregate transactions for a variety of onchain applications that receive transaction data.