Typescript Engineer (MEE) Task

Local Blockchain Setup

1. Install foundry

curl -L https://foundry.paradigm.xyz | bash

2. Run foundry

foundryup

3. Fork mainnet

Go to any service that provides access to blockchain nodes, such as alchemy or infura and register an account to get RPC url

anvil --fork-url https://eth-mainnet.g.alchemy.com/v2/{YOUR_KEY_HERE}

Remember to copy a test account with ETH for the next step

0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266
0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80

4. Test connection

curl -X POST http://127.0.0.1:8545 \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

Local MEE Node Deployment

1. Clone GH repo

git clone https://github.com/bcnmy/mee-node-deployment
cd mee-node-deployment

2. Create a new configuration folder

mkdir chains-local
cp chains-prod/1.json chains-local/1.json

3. Set http://host.docker.internal:8545 as RPC url in chains-local/1.json

4. Set chains-local as volume in docker-compose.yml

5. Set private key obtained from anvil as KEY variable in docker-compose.yml

6. Start the node

docker compose up -d

7. Test connection

curl http://localhost:3000/v3/info

Fund a Test EOA

1. Go to etherscan to get an address with a significant amount of USDC

0x37305B1cD40574E4C5Ce33f8e8306Be057fD7341

2. Check the balance of this address using local setup. The cast utility was installed as part of the foundry

cast call 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48 \
  "balanceOf(address)(uint256)" \
  0x37305B1cD40574E4C5Ce33f8e8306Be057fD7341

3. Fund whale address with ETH using an account obtained from anvil in the previous step. This account has to have ETH to pay for the gas fee in the next step

cast send 0x37305B1cD40574E4C5Ce33f8e8306Be057fD7341 \
--from 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 \
--value 1000000000000000000 \
--unlocked

3. Transfer tokens from whale address to test EOA

cast rpc anvil_impersonateAccount 0x37305B1cD40574E4C5Ce33f8e8306Be057fD7341

cast send 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48 \
--from 0x37305B1cD40574E4C5Ce33f8e8306Be057fD7341 \
  "transfer(address,uint256)(bool)" \
  0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 \
  1000000000000000 \
  --unlocked

4. Verify the transfer

cast call 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48 \
  "balanceOf(address)(uint256)" \
  0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266

Initialize Biconomy abstract.js SDK

1. Setup environment

nano .env

2. Install dependencies

npm i

2. Run the code in dev mode

npm run dev

Execute a Fusion Supertransaction

See the code.