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 = '0.3.1';
17export const license = 'MIT';
18
19const SEC_IN_DAY = 86400;
20
21export function setup(sdk: Context) {
22  const OP_GAS_PREDEPLOY = '0x420000000000000000000000000000000000000F';
23  const OP_GAS_ABI = [
24    {
25      inputs: [
26        {
27          internalType: 'bytes',
28          name: '_data',
29          type: 'bytes',
30        },
31      ],
32      name: 'getL1Fee',
33      outputs: [
34        {
35          internalType: 'uint256',
36          name: '',
37          type: 'uint256',
38        },
39      ],
40      stateMutability: 'view',
41      type: 'function',
42    },
43  ];
44
45  const provider = sdk.ethers.getProvider('optimism');
46  const gasPredeployContract = sdk.ethers.getContract(OP_GAS_PREDEPLOY, OP_GAS_ABI, 'optimism');
47
48  const getTransferEthCost = async () => {
49    const l2GasPrice = await provider.getGasPrice();
50    const l2GasEstimate = await provider.estimateGas({
51      from: '0xbeefbeefbeefbeefbeefbeefbeefbeefbeefbeef', // Address has enough ETH that this won't fail
52      to: '0xcafebeefcafebeefcafebeefcafebeefcafebeef',
53      value: '0x38d7ea4c68000', // 0.001 ETH
54    });
55    const l1GasCost = await gasPredeployContract.getL1Fee(
56      sdk.ethers.utils.serializeTransaction({
57        nonce: 1234,
58        value: '0x38d7ea4c68000', // 0.001 ETH
59        gasPrice: l2GasPrice,
60        gasLimit: l2GasEstimate,
61        to: '0xcafebeefcafebeefcafebeefcafebeefcafebeef',
62        data: '0x',
63      })
64    );
65    const totalGasCostWei = l2GasPrice.mul(l2GasEstimate).add(l1GasCost).toNumber();
66    const ethPrice = await sdk.coinGecko.getCurrentPrice('ethereum');
67    return (totalGasCostWei * ethPrice) / 1e18;
68  };
69
70  const getTransferTokenCost = async () => {
71    const l2GasPrice = await provider.getGasPrice();
72    const l2GasEstimate = await provider.estimateGas({
73      from: '0x11e4857bb9993a50c685a79afad4e6f65d518dda', // Random account with USDT
74      to: '0x94b008aa00579c1307b0ef2c499ad98a8ce58e58', // USDT Contract
75      data:
76        '0xa9059cbb00000000000000000000000023e7039c34c7aa47a0d4e975fbc789e0f763fa640000000000000000000000000000000000000000000000000000000000000001',
77    });
78    const l1GasCost = await gasPredeployContract.getL1Fee(
79      sdk.ethers.utils.serializeTransaction({
80        nonce: 1234,
81        value: '0x',
82        gasPrice: l2GasPrice,
83        gasLimit: l2GasEstimate,
84        to: '0x94b008aa00579c1307b0ef2c499ad98a8ce58e58',
85        data:
86          '0xa9059cbb00000000000000000000000023e7039c34c7aa47a0d4e975fbc789e0f763fa640000000000000000000000000000000000000000000000000000000000000001',
87      })
88    );
89    const totalGasCostWei = l2GasPrice.mul(l2GasEstimate).add(l1GasCost).toNumber();
90    const ethPrice = await sdk.coinGecko.getCurrentPrice('ethereum');
91    return (totalGasCostWei * ethPrice) / 1e18;
92  };
93
94  const getSwapCost = async () => {
95    const l2GasPrice = await provider.getGasPrice();
96    const l2GasEstimate = await provider.estimateGas({
97      from: '0x11e4857bb9993a50c685a79afad4e6f65d518dda', // Random account with USDT
98      to: '0xe592427a0aece92de3edee1f18e0157c05861564', // Uniswap Router
99      data:
100        '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',
101    });
102    const l1GasCost = await gasPredeployContract.getL1Fee(
103      sdk.ethers.utils.serializeTransaction({
104        nonce: 1234,
105        value: '0x',
106        gasPrice: l2GasPrice,
107        gasLimit: l2GasEstimate,
108        to: '0xe592427a0aece92de3edee1f18e0157c05861564',
109        data:
110          '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',
111      })
112    );
113    const totalGasCostWei = l2GasPrice.mul(l2GasEstimate).add(l1GasCost).toNumber();
114    const ethPrice = await sdk.coinGecko.getCurrentPrice('ethereum');
115    return (totalGasCostWei * ethPrice) / 1e18;
116  };
117
118  const getAverageSwapFee = async (date: string) => {
119    const dayId = Math.floor(sdk.date.dateToTimestamp(date) / SEC_IN_DAY);
120
121    const query = `{
122      dayStat(id: "${dayId}") {
123        averageCostUSD
124      }
125      nextDay: dayStat(id: "${dayId + 1}") {
126        averageCostUSD
127      }
128    }`;
129
130    const result = await sdk.graph.query('dmihal/optimism-average-fees', query);
131
132    if (!result.dayStat) {
133      throw new Error('Data unavailable');
134    }
135    if (!result.nextDay) {
136      throw new Error('Day incomplete');
137    }
138    return parseFloat(result.dayStat.averageCostUSD);
139  };
140
141  sdk.register({
142    id: 'optimistic-ethereum',
143    queries: {
144      feeTransferEth: getTransferEthCost,
145      feeTransferERC20: getTransferTokenCost,
146      feeSwap: getSwapCost,
147      oneDayAverageFeeSwap: getAverageSwapFee,
148    },
149    metadata: {
150      icon: sdk.ipfs.getDataURILoader(
151        'QmS1mBxRRDjuVPAPkjrmrnVgzYwyfchjvRZTH11vgjqabG',
152        'image/svg+xml'
153      ),
154      category: 'l2',
155      name: 'Optimism',
156      description:
157        'Optimism is an EVM-equivalent Optimistic Rollup chain. It aims to be simple, fast, and secure.',
158      l2BeatSlug: 'optimism',
159      website: 'https://optimism.io',
160      flags: {
161        throtle:
162          'Optimism is throttled while in beta. Fees will decrease as this throttle is lifted.',
163      },
164    },
165  });
166}
167