kleros/foresight/indexer-wildcard

contracts:
  - name: ERC20
    events:
      - event: Transfer(indexed address from, indexed address to, uint256 value)
 
chains:
  - id: 1
    contracts:
      - name: ERC20
        # No address = wildcard (indexes ALL matching events on the chain)

indexer.onEvent({ contract: "ERC20", event: "Transfer", wildcard: true }, async ({ event, context }) => {
  const tokenAddress = event.srcAddress; // The actual contract address
  const id = `${event.chainId}-${event.transaction.hash}-${event.logIndex}`;
  context.Transfer.set({
    id,
    token_id: `${event.chainId}-${tokenAddress}`,
    from: event.params.from,
    to: event.params.to,
    value: event.params.value,
  });
});

indexer.onEvent(
  {
    contract: "ERC20",
    event: "Transfer",
    wildcard: true,
    where: { params: { from: ZERO_ADDRESS } },
  },
  async ({ event, context }) => {
    /* ... */
  },
);