json-rpc-capabilities-middleware example usage via MetaMask

request-perms.js

const requestedPermissions = {
  eth_accounts: {},
  eth_sendTransaction: {},
  eth_decrypt: {},
};

async function main () {
  const provider = window.ethereum
  await provider.enable({ requestedPermissions });
  await provider.send({ method: 'eth_sendTransaction', parameters:[{ to: me, value: aModestSum }] });
}

main();