ponder.config.ts

Ponder's configuration file file contains smart contract addresses, paths to ABIs, RPC URLs, and database connection details.

• ponder.config.ts must provide a named export called config, not a default export.
• By default, ponder {dev/start/codegen} looks for ponder.config.ts in the current working directory, but you can specify a different path with the --config-file option to ponder dev or ponder start.
• The config variable exported by ponder.config.ts can be an object, a function, or a function returning a Promise (you can do async stuff to determine your config).

Fields

Networks

Networks are Ethereum-based blockchains like Ethereum mainnet, Goerli, or Foundry's local Anvil node. Each network has a name, chainId, and rpcUrl.

Contracts

Contracts are smart contracts deployed to a network. All contracts defined here will become available as ReadOnlyContract objects in the event context. Ponder will fetch and handle event logs emitted by all contracts with isLogEventSource: true (the default).

Filters

Filters are custom event log filters. Ponder will fetch and handle event logs that match the filter field.

Filter

Database

Ponder uses a SQL database to cache blockchain data and store entity data. In development, Ponder uses a SQLite database located at .ponder/cache.db. In production, Ponder needs a PostgreSQL database. If no database is specified in ponder.config.ts, Ponder will use SQLite unless the DATABASE_URL environment variable is present, in which case it will use PostgreSQL with DATABASE_URL as the connection string.

See Deploy to production for more details.

Options

Examples

Basic example

import type { Config } from "@ponder/core";
 
export const config: Config = {
  networks: [
    {
      name: "mainnet",
      chainId: 1,
      rpcUrl: process.env.PONDER_RPC_URL_1
    }
  ],
  contracts: [
    {
      name: "ArtGobblers",
      network: "mainnet",
      abi: "./abis/ArtGobblers.json",
      address: "0x60bb1e2aa1c9acafb4d34f71585d7e959f387769",
      startBlock: 15863321
    }
  ]
};

Async function

import type { Config } from "@ponder/core";
 
export const config: Config = async () => {
  const startBlock = await fetch("http://...");
 
  return {
    networks: [
      /* ... */
    ],
    contracts: [
      {
        name: "ArtGobblers",
        network: "mainnet",
        abi: "./abis/ArtGobblers.json",
        address: "0x60bb1e2aa1c9acafb4d34f71585d7e959f387769",
        startBlock: startBlock
      }
    ]
  };
};