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Cross-chain flows use the Universal Announcement Bus (Wormhole). UAB must be configured for the client’s chainId (bundled on Sepolia) or passed via contracts.

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Build relay

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buildAnnounceWithRelayRequest(send, opts?)

Ethereum: build { to, data, value } for announceWithRelay. value is the Wormhole message fee. 
const send = client.prepareStealthSend(metaAddressHex);
const req = await client.buildAnnounceWithRelayRequest(send, {
  consistencyLevel: undefined,
});
await walletClient.sendTransaction({
  to: req.to,
  data: req.data,
  value: req.value,
});

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buildAnnounceWithRelay(chain, send, opts?)

Discriminated builder for Ethereum or Solana. 
// Ethereum
const evm = await client.buildAnnounceWithRelay("ethereum", send);
// { chain: "ethereum", to, data, value, chainId }

// Solana
const sol = await client.buildAnnounceWithRelay("solana", send, {
  batchId: 1,
  wormholeFee: undefined,  // auto-fetched
});
// { chain: "solana", instructions, signers }
Solana note: signers includes the Wormhole message keypair, which must co-sign with solanaWallet.

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Fetch and scan

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fetchCrossChainAnnouncements(opts?)

Read inbound UAB announcements as indexer-shaped rows. 
const rows = await client.fetchCrossChainAnnouncements({
  fromBlock: 5_000_000n,
  toBlock: "latest",
});

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scanCrossChain(opts?)

Fetch + WASM filter to owned outputs from UAB only. 
const owned = await client.scanCrossChain();

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Bundled in send / unified scan

sendStealthPayment({ relay: true }) calls the relay path internally. scan({ includeCrossChain: true }) merges UAB outputs with source: "uab" (default when UAB is deployed and Ethereum is scanned). 
const inbox = await client.scan({
  chains: ["ethereum"],
  includeCrossChain: true,
});

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Low-level UAB exports

Re-exported from @opaquecash/uab via @opaquecash/opaque: 
import {
  fetchVaa,
  getUabDeployment,
  requireUabDeployment,
  CONSISTENCY_FINALIZED,
  CONSISTENCY_SAFE,
  WORMHOLESCAN_TESTNET,
} from "@opaquecash/opaque";
Payload codec from @opaquecash/stealth-core: 
import {
  encodeUabPayload,
  decodeUabPayload,
  UAB_PAYLOAD_LENGTH,
} from "@opaquecash/opaque";

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Relayer

VAAs must be delivered to UABReceiver on the destination chain. Use opaquecash/relayer for off-chain delivery. See Cross-chain announcements.