unable to map abi string to array to object with known keys source, contract

Question

I am trying to use the ContractPromise from @polkadot/api-contract to interact with a published smart contract on the moonriver network but when I try and create a new ContractPromise object I get the error

Error: createType(ContractProjectInfo):: Struct: Unable to map" + abi string + "array to object with known keys source, contract"

I'm not entirely sure why this is because the ABI and contract address seem to be correct.

The code I am using to test it out is here:

import { ApiPromise, WsProvider } from "@polkadot/api";
import { ContractPromise } from "@polkadot/api-contract";
import { ksmContractABI } from "./consts";

async function main() {
  console.log("start");
  const ksmContractAddress = "0xFfc7780C34B450d917d557E728f033033CB4fA8C";
  const wsProvider = new WsProvider("wss://kusama-rpc.polkadot.io");
  const api = await ApiPromise.create({ provider: wsProvider });
  const contract = new ContractPromise(
    api,
    JSON.stringify(ksmContractABI),
    ksmContractAddress
  );
  console.log("done");
}

the contract can be seen here: https://moonriver.moonscan.io/address/0xFfc7780C34B450d917d557E728f033033CB4fA8C

and the code from which I generated my abi can be found here: https://github.com/mixbytes/lido-dot-ksm/blob/main/contracts/Lido.sol

Answer 1

The comments are correct, @polkadot/api-contract can only interact with wasm contracts deployed on chains that include pallet-contracts

In your case, you need a JS solution to interact with an Ethereum smart contract on Moonriver, which uses a different set of pallets.

The Moonbeam docs have a tutorial on how to configure Hardhat and interact with a deployed contract in the Hardhat console. https://docs.moonbeam.network/builders/build/eth-api/dev-env/hardhat

Another option you could try is compiling Solidity for Substrate with Solang and using it with @polkadot/api
https://github.com/hyperledger-labs/solang#build-for-substrate