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ERC-20

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How do I transfer ROOT token?

ROOT token contract address is 0xcCcCCccC00000001000000000000000000000000 and it fully supports the ERC-20 standard. 
import { Contract, utils } from "ethers";
import { ERC20_PRECOMPILE_ABI } from "@therootnetwork/evm";

const ROOT_ADDRESS = "0xcCcCCccC00000001000000000000000000000000";

const wallet = new Wallet(...);
const contract = new Contract(ROOT_ADDRESS, ERC20_PRECOMPILE_ABI);
const oneROOT = utils.parseUnits(1, 6);

// transfer 1 ROOT to Alice
await contract.connect(wallet).transfer("0xE04CC55ebEE1cBCE552f250e85c57B70B2E2625b", oneROOT);

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How do I transfer XRP token or any other ERC-20 tokens?

Just like the ROOT token, XRP and any other ERC-20 token contract addresses can be derived from its native asset IDs. 
import { Contract, utils } from "ethers";
import { ERC20_PRECOMPILE_ABI, assetIdToERC20Address } from "@therootnetwork/evm";

const XRP_ID = 2;
const XRP_ADDRESS = assetIdToERC20Address(2);

const wallet = new Wallet(...);
const contract = new Contract(XRP_ADDRESS, ERC20_PRECOMPILE_ABI, wallet);
const oneXRP = utils.parseUnits(1, await contract.decimals());

// transfer 1 ROOT to Alice
await contract.connect(wallet).transfer("0xE04CC55ebEE1cBCE552f250e85c57B70B2E2625b", oneXRP);
Tip:
To retrieve a list of available tokens and their asset IDs, check out the Tokens section in our Rootscan Explorer.

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ERC-721

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How do I create and mint an ERC-721 NFT?

It’s possible to create an ERC-712 collection by calling initializeCollection() method exposed by the nft precompile. 
import { Contract, utils } from "ethers";
import { NFT_PRECOMPILE_ABI, NFT_PRECOMPILE_ADDRESS } from "@therootnetwork/evm";

const wallet = new Wallet(...);
const contract = new Contract(NFT_PRECOMPILE_ADDRESS, NFT_PRECOMPILE_ABI);

const tx = await contract.connect(wallet).initializeCollection(
  wallet.address, // owner address
  utils.toUtf8Bytes("My Collection"), // collection name
  BigNumber.from(0), // no max issuance
  utils.toUtf8Bytes("https://example.com/nft/metadata/"), // metadataPath
  [wallet.address], // royaltyAddresses
  [100_000], // royaltyEntitlements
);

const receipt = await tx.wait();
const collectionAddress = (receipt?.events as any)[0].args.precompileAddress;
Caution: The royaltyEntitlements is in permill (parts per million) scaling, so if you want a 10% royalty, that would be 100,000 (as (100_000 / 1_000_000) * 100 = 10%).
Once the collection is created, use the same owner wallet to mint the NFT: 
import { Contract, utils } from "ethers";
import { ERC721_PRECOMPILE_ABI } from "@therootnetwork/evm";

const wallet = new Wallet(...);
const contract = new Contract(collectionAddress, ERC721_PRECOMPILE_ABI);

// Mint 1 NFT for Alice
await contract.connect(wallet).mint("0xE04CC55ebEE1cBCE552f250e85c57B70B2E2625b", 1);