ERC-4337 | How to make a smart contract account and send your first userOperations

In this video, Blocknative PM and 4337 Researcher Blair Marshall will walk you through how to:
-create a smart contract account
-make your first ERC-4337 transaction by sending userOperations to the Blocknative bundler
-monitor your transaction in real-time
-conduct a Uniswap approval transaction and token swap in the same userOperation
Important Links:
- Blocknative Bundler Docs: docs.blocknati...
- Blocknative Mempool Explorer (Monitor EntryPoint Contract): explorer.block...
- Blocknative UserOps Explorer: 4337.blocknati...
- StackUp Quickstart Docs: docs.stackup.s...

[@wnmarc]

Finally good video quality, thank you!

[@ranjeetvhanmane5694]

#0xgas #AccountAbstraction the 0xGasless SDK marks a significant step forward in making blockchain technology more accessible and user-friendly

[@pengfawu1805]

Your sounds really let me think of soul goodman!

[@SeanOConnor0]

Finally, ethereum's ERC-4337 is accesible

[@maniparitala3963]

In the scenario where we have created a smart contract account requiring a payment of a certain amount of GAS, the responsibility of providing the GAS falls upon the paymaster???

[@thefatemokid]

in the uniswap example, the approve is not necessary. you are swapping ETH as input

[@joules8608]

🙌

[@SandeepMishra-ik1nf]

How passing private key to user op is safe?

[@beyonders.oficial]

Hey great video! But I'd like to know how can I change the Smart Contract Account contract? I want to change the validateUserOp method. Don't wanna use the SimpleAccount contract.

[@runsteeprunfast]

Diagram of what is happening and why plz

[@thebatmakescomics]

How do you deploy a smart contract with userOps? when I place a small contract bytecode in the data param for simpleAccount.execute it bombs out.

[@justkaz7104]

109

[@justin0613ify]

I am getting error {"error":{"code":-32602,"data":"preVerificationGas: below expected gas of 48152","message":"preVerificationGas: below expected gas of 48152"},"id":43,"jsonrpc":"2.0"}

[@angphamminh6247]

hi, do you solve this error ? Can you help me ?

[@0xleanlp]

​@@angphamminh6247 this error referent invalid method parameters, may be build wront a call data. :)

[@maniparitala3963]

am getting error- "code\":-32602,\"data\":\"preVerificationGas: below expected gas of 48188\",\"message\":\"preVerificationGas: below expected gas of 48188\"

[@0xleanlp]

this error referent invalid method parameters, may be build wront a call data. :)

[@samiansari9387]

I am getting error- "code\":-32602,\"data\":\"preVerificationGas: below expected gas of 48188\",\"message\":\"preVerificationGas: below expected gas of 48188\"

[@blairlmarshall]

Hey there - I had this problem once and I believe its a slight issue with the @account-abstraction sdk library. One hacky solution is to go to node_modules/@account-abstraction/sdk/dist/calPreVerificationGas.js and in the function calcVerficationGas add in an extra 10000 to the ret value. Something like:
Math.round(callDataCost +
ov.fixed / ov.bundleSize +
ov.perUserOp +
ov.perUserOpWord * lengthInWord + 10000);
I am not sure exactly what's wrong with this function, but the above worked for me to get it working. Let me know if that works for you!

[@angphamminh6247]

hi, do you solve this error ? Can you help me ?