Hop Bridge

1export const name = 'Hop Bridge';
2export const version = '0.1.2';
3export const license = 'MIT';
4
5interface Token {
6  stablecoin?: boolean
7  coingecko?: string
8  decimals?: number
9}
10
11const tokens: { [id: string]: Token } = {
12  DAI: {
13    stablecoin: true,
14  },
15  ETH: {
16    coingecko: 'ethereum',
17  },
18  HOP: {
19    coingecko: 'hop-protocol',
20  },
21  MATIC: {
22    coingecko: 'matic-network',
23  },
24  SNX: {
25    coingecko: 'havven',
26  },
27  USDC: {
28    stablecoin: true,
29    decimals: 6,
30  },
31  USDT: {
32    stablecoin: true,
33    decimals: 6,
34  },
35  WBTC: {
36    coingecko: 'bitcoin',
37    decimals: 6,
38  },
39  sUSD: {
40    stablecoin: true,
41  },
42}
43
44const chains = [
45  {
46    id: 'optimism',
47  },
48  {
49    id: 'arbitrum-one',
50    name: 'Arbitrum One',
51    hopChain: 'arbitrum',
52  },
53  {
54    id: 'polygon',
55  },
56  {
57    id: 'gnosis-chain',
58    hopChain: 'gnosis',
59    name: 'Gnosis Chain',
60  },
61]
62
63export function setup(sdk: Context) {
64  let configPromise: Promise<any> | null = null;
65  const getConfig = () => {
66    if (!configPromise) {
67      configPromise = sdk.http.get('https://assets.hop.exchange/mainnet/v1-core-config.json');
68    }
69    return configPromise;
70  }
71
72  const getPrice = async (id: string): Promise<number> => {
73    const token = tokens[id];
74
75    if (!token) {
76      sdk.log.warn(`Token ${id} not found`);
77      return 0;
78    }
79    if (token.stablecoin) {
80      return 1;
81    }
82
83    const price = await sdk.defiLlama.getCurrentPrice('coingecko', token.coingecko);
84    return price;
85  }
86
87  const getHTokenValue = async (chain: string, hopChain?: string) => {
88    const config = await getConfig();
89
90    const amounts = await Promise.all(
91      Object.entries(config.bridges).map(async ([token, chains]) => {
92        if (chains[hopChain || chain]) {
93          const [supply, price] = await Promise.all([
94            sdk.ethers.getERC20Contract(chains[hopChain || chain].l2HopBridgeToken, chain).totalSupply(),
95            getPrice(token),
96          ]);
97          const decimals = tokens[token] ? tokens[token].decimals || 18 : 0;
98          return supply * price / (10 ** decimals);
99        }
100        return 0;
101      })
102    );
103
104    const sum = amounts.reduce((a, b) => a + b, 0);
105    return sum;
106  }
107
108  const metadata = {
109    name: 'Hop',
110    icon: sdk.ipfs.getDataURILoader('Qma6xqAk9BksRvPZvTtJZs1BrPaAxAEyeY7ufWvAmteKso', 'image/svg+xml'),
111    category: 'native',
112  };
113
114  sdk.registerBundle('hop', metadata);
115
116  for (const chain of chains) {
117    sdk.register({
118      id: `hop-${chain.id}`,
119      bundle: 'hop',
120      queries: {
121        currentValueBridgedAToB: () => getHTokenValue(chain.id, chain.hopChain),
122        currentValueBridgedBToA: async () => 0,
123      },
124      metadata: {
125        ...metadata,
126        subtitle: chain.name || `${chain.id.charAt(0).toUpperCase()}${chain.id.substr(1)}`,
127
128        chainA: 'ethereum',
129        chainB: chain.id,
130      },
131    });
132  }
133}
134