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Bundlers let you run multiple onchain operations in one atomic transaction—approvals, wrapping, supply, borrow, and more—so users complete flows in a single step and you save gas. For user-facing apps on Morpho, using a bundler is the recommended approach.
For details, see the Bundler3 contract.

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Why use bundlers

  • Simpler UX: Users can open leveraged positions or deposit into vaults in one transaction instead of many.
  • Lower gas: One transaction costs less than several separate ones.
  • Atomicity: If any step fails, the whole transaction reverts so users never end up in a half-complete state (e.g. tokens approved but not supplied).

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Supported operations

Bundlers support:
  • Tokens: ERC20 approvals (including permit/permit2), wrap/unwrap native assets, transfers
  • Bend markets: Supply, supplyCollateral, borrow, repay, withdraw
  • Bend vaults: Deposit and withdraw (ERC-4626 vaults)
  • Public Allocator: reallocateTo to move liquidity between markets
  • Rewards: Claim from the Universal Rewards Distributor (URD)
  • Swaps: DEX aggregator swaps
If you grant Bundler3 token approval, it can execute any transaction on your behalf. Avoid granting Bundler3 approval (standard approval or permit).