Set up RPC access for PontusX

[csillag]

(To verify balances.)

[github-actions]

Deployed to Cloudflare Pages

Latest commit:	7c6e5e4c8a522975ed230ed78f0a53b27a68c6ad
Status:	✅ Deploy successful!
Preview URL:	https://ea5c0b0f.oasis-explorer.pages.dev

[lukaw3d]

notes from discussions:

• this isn't publicly accessible, but backend has access. In the future nexus will get the balance from RPC
• Frontend can get the balances from https://testnet.grpc.oasis.dev if we replace our web3 RPC fetching with oasis RPC

// node node-get-runtime-balance.mjs
import oasis from '@oasisprotocol/client'
import oasisRT from '@oasisprotocol/client-rt'
import xhr2 from 'xhr2'
global.XMLHttpRequest = xhr2 // fixes oasis sdk in nodejs

  const testnetNic = new oasis.client.NodeInternal('https://testnet.grpc.oasis.dev')
  const accountsWrapper = new oasisRT.accounts.Wrapper(oasis.misc.fromHex('0000000000000000000000000000000000000000000000004febe52eb412b421'));

  const daveEthAddr = '0x9c26685b6E8e2997d9aAf3f1a642f1b1b3dB9580';
  const daveEthAddrU8 = oasis.misc.fromHex(daveEthAddr.slice(2));
  const daveAddr = await oasis.address.fromData(
    oasisRT.address.V0_SECP256K1ETH_CONTEXT_IDENTIFIER,
    oasisRT.address.V0_SECP256K1ETH_CONTEXT_VERSION,
    daveEthAddrU8,
  );

  (await accountsWrapper.queryBalances().setArgs({address: daveAddr,}).query(testnetNic)).balances
    .forEach((balance, name) => console.log(oasis.misc.toStringUTF8(name) || 'native', oasis.quantity.toBigInt(balance)));
  // native 908027345930000000000n
  // TEST 10000000000000000000n

  // https://explorer.dev.oasis.io/testnet/pontusx/address/0x9c26685b6E8e2997d9aAf3f1a642f1b1b3dB9580
  // 908.02734593 EUROe
  // 10 TEST

[csillag]

Superseded by #1338. Closing.