Optimism Transaction Fees

1/*
2Fees are calculated as follows (https://community.optimism.io/docs/developers/l2/new-fees.html):
3
4Total transaction fee is a combination of an "L2 execution fee" and an "L1 security fee":
5
6total_fee = (l2_gas_price * l2_gas_used) + (l1_gas_price * l1_gas_used)
7
8Where:
9- `l2_gas_price` corresponds to the cost of execution on L2
10- `l2_gas_used` corresponds to the amount of gas used on L2
11- `l1_gas_price` corresponds to the cost of publishing the transaction data on L1
12- `l1_gas_used` corresponds to the amount of transaction data published on L1
13*/
14
15export const name = 'Optimism Transaction Fees';
16export const version = '0.2.0';
17export const license = 'MIT';
18
19export function setup(sdk: Context) {
20  const OP_GAS_PREDEPLOY = '0x420000000000000000000000000000000000000F';
21  const OP_GAS_ABI = [
22    {
23      inputs: [
24        {
25          internalType: 'bytes',
26          name: '_data',
27          type: 'bytes',
28        },
29      ],
30      name: 'getL1Fee',
31      outputs: [
32        {
33          internalType: 'uint256',
34          name: '',
35          type: 'uint256',
36        },
37      ],
38      stateMutability: 'view',
39      type: 'function',
40    },
41  ];
42
43  const provider = sdk.ethers.getProvider('optimism');
44  const gasPredeployContract = sdk.ethers.getContract(OP_GAS_PREDEPLOY, OP_GAS_ABI, 'optimism');
45
46  const getTransferEthCost = async () => {
47    const l2GasPrice = await provider.getGasPrice();
48    const l2GasEstimate = await provider.estimateGas({
49      from: '0xbeefbeefbeefbeefbeefbeefbeefbeefbeefbeef', // Address has enough ETH that this won't fail
50      to: '0xcafebeefcafebeefcafebeefcafebeefcafebeef',
51      value: '0x38d7ea4c68000', // 0.001 ETH
52    });
53    const l1GasCost = await gasPredeployContract.getL1Fee(
54      sdk.ethers.utils.serializeTransaction({
55        nonce: 1234,
56        value: '0x38d7ea4c68000', // 0.001 ETH
57        gasPrice: l2GasPrice,
58        gasLimit: l2GasEstimate,
59        to: '0xcafebeefcafebeefcafebeefcafebeefcafebeef',
60        data: '0x',
61      })
62    );
63    const totalGasCostWei = l2GasPrice.mul(l2GasEstimate).add(l1GasCost).toNumber();
64    const ethPrice = await sdk.coinGecko.getCurrentPrice('ethereum');
65    return (totalGasCostWei * ethPrice) / 1e18;
66  };
67
68  const getTransferTokenCost = async () => {
69    const l2GasPrice = await provider.getGasPrice();
70    const l2GasEstimate = await provider.estimateGas({
71      from: '0x11e4857bb9993a50c685a79afad4e6f65d518dda', // Random account with USDT
72      to: '0x94b008aa00579c1307b0ef2c499ad98a8ce58e58', // USDT Contract
73      data:
74        '0xa9059cbb00000000000000000000000023e7039c34c7aa47a0d4e975fbc789e0f763fa640000000000000000000000000000000000000000000000000000000000000001',
75    });
76    const l1GasCost = await gasPredeployContract.getL1Fee(
77      sdk.ethers.utils.serializeTransaction({
78        nonce: 1234,
79        value: '0x',
80        gasPrice: l2GasPrice,
81        gasLimit: l2GasEstimate,
82        to: '0x94b008aa00579c1307b0ef2c499ad98a8ce58e58',
83        data:
84          '0xa9059cbb00000000000000000000000023e7039c34c7aa47a0d4e975fbc789e0f763fa640000000000000000000000000000000000000000000000000000000000000001',
85      })
86    );
87    const totalGasCostWei = l2GasPrice.mul(l2GasEstimate).add(l1GasCost).toNumber();
88    const ethPrice = await sdk.coinGecko.getCurrentPrice('ethereum');
89    return (totalGasCostWei * ethPrice) / 1e18;
90  };
91
92  const getSwapCost = async () => {
93    const l2GasPrice = await provider.getGasPrice();
94    const l2GasEstimate = await provider.estimateGas({
95      from: '0x11e4857bb9993a50c685a79afad4e6f65d518dda', // Random account with USDT
96      to: '0xe592427a0aece92de3edee1f18e0157c05861564', // Uniswap Router
97      data:
98        '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',
99    });
100    const l1GasCost = await gasPredeployContract.getL1Fee(
101      sdk.ethers.utils.serializeTransaction({
102        nonce: 1234,
103        value: '0x',
104        gasPrice: l2GasPrice,
105        gasLimit: l2GasEstimate,
106        to: '0xe592427a0aece92de3edee1f18e0157c05861564',
107        data:
108          '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',
109      })
110    );
111    const totalGasCostWei = l2GasPrice.mul(l2GasEstimate).add(l1GasCost).toNumber();
112    const ethPrice = await sdk.coinGecko.getCurrentPrice('ethereum');
113    return (totalGasCostWei * ethPrice) / 1e18;
114  };
115
116  sdk.register({
117    id: 'optimistic-ethereum',
118    queries: {
119      feeTransferEth: getTransferEthCost,
120      feeTransferERC20: getTransferTokenCost,
121      feeSwap: getSwapCost,
122    },
123    metadata: {
124      icon: sdk.ipfs.getDataURILoader(
125        'QmS1mBxRRDjuVPAPkjrmrnVgzYwyfchjvRZTH11vgjqabG',
126        'image/svg+xml'
127      ),
128      category: 'l2',
129      name: 'Optimism',
130      description:
131        'Optimism is an EVM-equivalent Optimistic Rollup chain. It aims to be simple, fast, and secure.',
132      l2BeatSlug: 'optimism',
133      website: 'https://optimism.io',
134      flags: {
135        throtle:
136          'Optimism is throttled while in beta. Fees will decrease as this throttle is lifted.',
137      },
138    },
139  });
140}
141