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Interact with more than one contract within one transaction

Interacting with more than one contract with one transaction is one of Starknet's features. To use this feature, two contracts are required.

Setup​

Set up basic stuff before multicall.

// devnet private key from Account #0 if generated with --seed 0
const privateKey = '0xe3e70682c2094cac629f6fbed82c07cd';
const accountAddress = '0x7e00d496e324876bbc8531f2d9a82bf154d1a04a50218ee74cdd372f75a551a';

// Ether token contract address
const contractAddress_1 = '0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7';

// contract address which require ether
const contractAddress_2 = '0x078f36c1d59dd29e00a0bb60aa2a9409856f4f9841c47f165aba5bab4225aa6b';

const account = new Account(provider, accountAddress, privateKey);

Interact with contracts​

Interact with more than one contract by using account.execute([calls]). The example is as follows.

const multiCall = await account.execute([
// Calling the first contract
{
contractAddress: contractAddress_1,
entrypoint: 'approve',
// approve 1 wei for bridge
calldata: CallData.compile({
spender: contractAddress_2,
amount: cairo.uint256(1),
}),
},
// Calling the second contract
{
contractAddress: contractAddress_2,
entrypoint: 'transfer_ether',
// transfer 1 wei to the contract address
calldata: CallData.compile({
amount: cairo.uint256(1),
}),
},
]);
await provider.waitForTransaction(multiCall.transaction_hash);