Proxy contracts

Ponder supports EIP-1967 proxy contracts (opens in a new tab) (Transparent and UUPS). Ponder handles proxy contracts by merging the ABI of the proxy contract with the ABI of the implementation contract.

The create-ponder Etherscan contract link template will automatically detect proxy contracts and fetch the required implementation contract ABIs.

To decode event logs emitted by a proxy contract, Ponder searches for a matching event in the implementation contract ABI(s). To avoid missing any events, make sure to include the ABI of every implementation contract that the proxy has ever had.

Add a proxy contract

Find the implementation contract ABI (or ABIs) and paste each into a JSON file in the abis/ directory. Tip: On Etherscan, there is a link to the implementation contract on the Contract → Read as Proxy tab.

Add the implementation contract ABI to the contract's abi field in ponder.config.ts.

ponder.config.ts

import type { Config } from "@ponder/core";
 
export const config: Config = {
  networks: [ /* ... */ ],
  contracts: [
    {
      name: "MyTokenContract",
      abi: [
        "./abis/MyTokenContract.json", // Proxy ABI
        "./abis/ERC1155.json" // Implementation ABI
      ],
      // ...
    }
  ]
};

Add event handlers for events defined in the implementation ABI. That's it!

src/index.ts

import { ponder } from "@/generated";
 
ponder.on("MyTokenContract:TransferBatch", async ({ event }) => {
  // ...
});

Custom log filters