2.31 ERC-20 (EVM example)

	At a glance
What it is	Transfer an asset through its ERC-20 precompile. Futureverse’s EVM example for The Root Network, with its README and source.
Where it sits	Part II — Building · Chapter 2.31
Covers	Examples · Source files
Source	github.com/futureversecom/trn-examples/tree/main/examples/evm/use-erc20

Transfer an asset through its ERC-20 precompile. Reference: ERC-20 precompile.

Copied from Futureverse’s futureversecom/trn-examples, deleted with its GitHub organisation, at commit 44c9e16 of 2024-10-31. Apache-2.0: license. Before you run it, read Running the examples.

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IMPORTANT

Ensure the following ENV vars are available before running the examples

• CALLER_PRIVATE_KEY - Private key of an account that submits the transaction. Follow this guide to create and fund an account with some test tokens on Porcini (testnet) if you don't have one yet.

2.31.1 Examples

# change your working directory to this example first
cd examples/evm/use-erc20

# export all required environments
export CALLER_PRIVATE_KEY=

# creates new collection
pnpm call:transfer

2.31.2 Source files

src/transfer.ts2.31.2.1

import { ERC20_PRECOMPILE_ABI } from "@therootnetwork/evm";
import { filterTransactionEvents } from "@trne/utils/filterTransactionEvents";
import { getERC20Contract } from "@trne/utils/getERC20Contract";
import { ASTO_ASSET_ID } from "@trne/utils/porcini-assets";
import { withEthersProvider } from "@trne/utils/withEthersProvider";
import { ContractReceipt } from "ethers";

/**
 * Use `ERC20.transfer` call to transfer token.
 *
 * Assumes the caller has XRP to pay for gas.
 */
withEthersProvider("porcini", async (provider, wallet, logger) => {
	const erc20 = getERC20Contract(ASTO_ASSET_ID).connect(wallet);
	const target = wallet.address;
	const amount = 0.1 * Math.pow(10, 18); // 0.1 ASTO

	logger.info(
		{
			parameters: {
				contractAddress: erc20.address,
				target,
				amount,
			},
		},
		`create "transfer" call`
	);

	logger.info(`dispatch transaction from wallet=${wallet.address}`);
	const tx = await erc20.transfer(target, amount.toString());
	const receipt = (await tx.wait()) as unknown as ContractReceipt;

	const [transferEvent] = filterTransactionEvents(ERC20_PRECOMPILE_ABI, receipt.logs, ["Transfer"]);

	logger.info(
		{
			result: {
				transactionHash: receipt.transactionHash,
				blockNumber: receipt.blockNumber,
				transferEvent: {
					name: transferEvent.name,
					args: transferEvent.args,
				},
			},
		},
		"receive result"
	);
});

package.json2.31.2.2

{
  "scripts": {
    "call": "tsx --tsconfig ../../../tsconfig.json",
    "call:transfer": "pnpm call src/transfer.ts"
  }
}

Source: futureversecom/trn-examples, examples/evm/use-erc20 (deleted) · commit 44c9e16, 2024-10-31 · Apache-2.0, license · part of Code examples

Associated docs

Where else you might go from here. Following one is optional — this chapter stands without them.

Assets (ERC-20)

See also — The ERC-20 contract address for The Root Network native tokens uses the following format:

Back matter — read in order

See also — The whole of Back matter as one continuous page, reprinted from its chapters without change.

Code examples

See also — Futureverse’s code examples for The Root Network: scripts for the native API and the EVM, and two contract projects, each with its README and source.

Contents

See also — Every chapter in this book, each with the one line that tells you what you get by reading it.

Front matter — read in order

See also — The whole of Front matter as one continuous page, reprinted from its chapters without change.

Guides for the code examples

See also — How Futureverse’s TRN code examples get a test account: create one in MetaMask and fund it from the Porcini faucet.

Index · A

See also — 609 index terms that start with A, each linked to the pages that define or use it.

Index · B

See also — 302 index terms that start with B, each linked to the pages that define or use it.