Introducing Compass Transaction Bundler: Build Full DeFi Workflows in One Atomic Transaction

TL;DR The Compass Transaction Bundler lets you build and automate complete, production-grade DeFi workflows — like leveraged lending, yield rebalancing, and one-tap earn — in a single atomic transaction, using just one API call. No Solidity. No blockchain engineering. So you can launch faster and focus on user experience, not blockchain plumbing. Live now on Ethereum, Arbitrum, and Base. Introducing Compass Transaction Bundler

Why we built this

If you’re building a wallet, DeFi app, exchange, or fintech product, sooner or later, you’ll need to support on-chain financial workflows. And that’s where most teams hit a wall.

Because today, building anything beyond a simple swap means:

Writing custom smart contracts
Chaining fragile protocol interactions
Debugging RPCs and signing logic
Or forcing users through 3 dapps and 10 clicks

It slows down your team and product, burns resources, and pulls your best engineers away from your core product. We built Compass Bundler so you don’t have to choose between shipping fast and doing it right.

Enter Compass Transaction Bundler

Compass Transaction Bundler is the simplest way to build and automate DeFi workflows, using nothing but API calls.

You define what you want to do: Supply → Borrow → Swap → Supply → Borrow → Stake → Claim

… any combination, across protocols like Aave, Morpho, Uniswap, Pendle, and more.

We return a ready-to-sign transaction. You sign and send.

One API call → One atomic transaction → Full execution. No Solidity. No blockchain engineering.

Built for real-world teams

Whether you’re a:

Wallet or super apps adding native DeFi
Fund or asset management firm automating strategies
Agent-based platforms executing smart flows programatically
Fintechs or stablecoin issuers embedding yield flows and Earn features

Compass Bundler gives you the power to build faster , execute atomically , and save gas. No smart contracts, custom integrations, or months of engineering work.

It’s fully non-custodial, and it works with our Python and TypeScript SDKs out of the box.

What you can build (in days, not months)

Some examples:

Leveraged lending on Aave and Morpho
Yield rebalancing to move funds between vaults or protocols
One-tap earn for retail and institutional users
Agent-executed transactions across multiple protocols
Custom strategies combining supply, borrow, swap, stake, claim, and more

And since all of this is handled by the API, not Solidity, you ship in days, not months.

How it works

Compass Bundler is a new endpoint in the Compass API, and integrates seamlessly with our SDKs.

At the core is the bundler_execute method, where you can pass in any DeFi action supported in Compass API (e.g. swap, supply, borrow, LP, etc):

res = compass_api.transaction_bundler.bundler_execute(
    chain=chain,
    sender=sender,
    signed_authorization=signed_authorization,
    actions=[
        # Set Allowance
        models.UserOperation(
            body=models.SetAllowanceParams(
                ACTION_TYPE="SET_ALLOWANCE",
                token=models.TokenEnum.USDC,
                contract=models.SetAllowanceParamsContract.UNISWAP_V3_ROUTER,
                amount="1",
            )
        ),
        # Swap WETH for USDC on Uniswap
        models.UserOperation(
            body=models.UniswapBuyExactlyParams(
                ACTION_TYPE="UNISWAP_BUY_EXACTLY",
                token_in=models.TokenEnum.WETH,
                token_out=models.TokenEnum.USDC,
                fee=models.FeeEnum.ZERO_DOT_01,
                max_slippage_percent=0.5,
                amount=1,
                wrap_eth=True,
            )
        ),
    ],
)

This returns a single transaction payload that your app can sign and broadcast.

Why teams love Compass Bundler

✅ Gas-efficient — bundle multiple actions into one tx

✅ Atomic — everything succeeds or reverts together

✅ Fast to integrate — no Solidity or audits

✅ Non-custodial — users sign and control assets

✅ Composable — supports any combination of integrated protocols

✅ Cross-chain — live on Ethereum, Arbitrum, and Base

Try it in <5 minutes

Live on Ethereum , Arbitrum , and Base. No contracts to deploy. It’s how modern crypto products will be built.

Introducing Compass Transaction Bundler: Build Full DeFi Workflows in One Atomic Transaction