Quickstart

npm install @opaquecash/opaque viem

import { OpaqueClient } from "@opaquecash/opaque";

const client = await OpaqueClient.fromWallet({
  wallets: { chain: "ethereum", address: userAddress, provider: window.ethereum },
  chainId: 11155111,                              // Sepolia
  rpcUrl: "https://ethereum-sepolia-rpc.publicnode.com",
  wasmModuleSpecifier: "/pkg/cryptography.js",    // required for scan/sweep/prove
});

wallets: { chain: "solana", publicKey, signMessage, signTransaction }

const metaAddress = client.getMetaAddressHex();
// Share this 98-byte hex so senders and issuers can pay or attest to you.

// High-level: submits the tx for you
const { txHash } = await client.registerMetaAddress("ethereum");

// Or build calldata and submit via your own wallet UI
const reg = client.buildRegisterMetaAddressTransaction();
await walletClient.sendTransaction({ to: reg.to, data: reg.data, chain: sepolia });

import { parseEther } from "viem";

const result = await client.sendStealthPayment({
  chain: "ethereum",
  recipient: "0xRecipientEoaAddress...",
  amount: parseEther("0.01"),
});

const { metaAddressHex, source } = await client.resolveRecipient(recipientInput);

const send = client.prepareStealthSend(metaAddressHex);
const announce = client.buildAnnounceTransactionRequest(send);
await walletClient.sendTransaction({ to: send.stealthAddress, value: parseEther("0.01"), chain: sepolia });
await walletClient.sendTransaction({ to: announce.to, data: announce.data, chain: sepolia });

const inbox = await client.scan({ chains: ["ethereum"] });
const balances = await client.getBalancesForOutputs(inbox);

if (inbox.length > 0) {
  const { tx } = await client.sweep({
    output: inbox[0],
    chain: inbox[0].chain,
    destination: freshAddress,
  });
}