kleros/foresight/indexer-multichain

const id = `${event.chainId}-${event.params.tokenId}`;
context.Token.set({ id, ...tokenData });

Contract.Event.handler(async ({ event, context }) => {
  const chainId = context.chain.id;
  const config = {
    1: { wrappedNative: "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2" },
    137: { wrappedNative: "0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270" },
  }[chainId];
  // context.chain.isRealtime is true once ALL chains have caught up to head
  if (context.chain.isRealtime) {
    // Realtime-only logic
  }
});

contracts:
  - name: ERC20
    events:
      - event: Transfer(indexed address from, indexed address to, uint256 value)
 
chains:
  - id: 1
    contracts:
      - name: ERC20
        address:
          - 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
  - id: 137
    contracts:
      - name: ERC20
        address:
          - 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174