@miradexio/client

TypeScript SDK for cross-chain swaps. Runs in-process in the browser or in Node, holding keys and signing locally. The server is untrusted: every state claim is verified on-chain. For BTC↔XMR the SDK runs the full atomic-swap drive loop itself; for THORChain, Chainflip, and NEAR Intents it verifies the deposit binding against the upstream's own infrastructure (THORNode/Midgard, Chainflip broker, 1Click).

Quick start

pnpm add @miradexio/client
# or
npm install @miradexio/client

import { MiradexEngine, type PlatformAdapter } from '@miradexio/client';

const platform: PlatformAdapter = /* see PlatformAdapter below */;

const engine = new MiradexEngine(
  {
    apiUrl: 'https://api.miradex.io/',
    network: 'mainnet',
    slippageBps: 300,
  },
  platform,
);

engine.on('state', (s) => {
  console.log(s.activeFlow?.kind, s.activeFlow?.snapshot.phase);
});

// BTC ↔ XMR (atomicswap)
await engine.startAtomicSwap({
  amount: '0.01',
  destAddress: '8...',
  refundAddress: 'bc1q...',
});

// Routed providers (thorchain, chainflip, near_intents)
const { quotes } = await engine.apiClient.getQuotes({
  from: 'BTC',
  to: 'ETH',
  amount: '0.01',
});
await engine.startSwap({
  fromToken: 'BTC',
  fromChain: 'bitcoin',
  toToken: 'ETH',
  toChain: 'ethereum',
  amount: '0.01',
  destAddress: '0x...',
  refundAddress: 'bc1q...',
  selectedQuote: quotes[0],
});

---

Providers

atomicswap — BTC ↔ XMR via the btc-xmr two-curve atomic-swap protocol. BTC locks into a 2-of-2 P2WSH; adaptor signatures tie Alice's BTC redemption to revealing the Monero scalar Bob needs to sweep. Refund is timelocked Bitcoin script and the SDK builds and broadcasts it without the server.

thorchain — 12 connected chains (BTC, ETH, BSC, AVAX, BASE, SOL, TRON, XRP, …) via THORChain Asgard TSS vaults. The SDK reads the active vault list from THORNode and Midgard directly.

chainflip — Bitcoin, Ethereum, Arbitrum, Solana, Polkadot, and Polkadot Assethub via per-swap deposit channels with destination and Fill-or-Kill refund addresses bound at channel creation. The SDK reads the channel from the broker and confirms.

near_intents — roughly 45 chains via NEAR Intents 1Click solver settlement. The SDK reads intent status from 1Click directly.

---

The SDK surface

The default import is @miradexio/client. Sub-path exports cover atomic-swap-only, verification-only, and bundler-friendly subsets; see the exports field in package.json.

PlatformAdapter

The engine is decoupled from host I/O. Implement PlatformAdapter for your environment; see the miradex-web browser adapter for a reference.

Direct entry points

Drive flows without the engine:

import { runAtomicSwap, SwapExecutor } from '@miradexio/client';

// Atomic swap, low-level:
await runAtomicSwap({
  api: apiClient,
  params: { amount: '0.01', destAddress: '8...', refundAddress: 'bc1q...', network: 'mainnet' },
  callbacks: { onProgress, onDepositRequired, saveKeystore, loadKeystore },
  signal: abortController.signal,
});

// Routed swap, low-level:
const executor = new SwapExecutor(apiClient);
const result = await executor.executeSwap({
  from: 'BTC', to: 'ETH', amount: '0.01',
  destAddress: '0x...', refundAddress: 'bc1q...',
  provider: 'thorchain',
});

---

Security model

The server is untrusted. Bitcoin state is verified against Electrum servers, Monero against monerod RPC servers, THORChain against THORNode + Midgard, Chainflip against the broker, NEAR Intents against 1Click.

---

Configuration

EngineConfig

The first argument to new MiradexEngine:

Field	Type	Default
apiUrl	string	required
network	'mainnet' | 'testnet' | 'regtest'	'mainnet'
slippageBps	number	100 (1.00%)
apiTimeout	number	60_000 ms
apiMaxRetries	number	3
monerodNodes	readonly string[]	network default
fetchFn	typeof fetch	globalThis.fetch

Defaults are exported from src/lib/default-config.ts.

---

Build

pnpm install
pnpm -F @miradexio/client build       # tsc → dist/
pnpm -F @miradexio/client typecheck
pnpm -F @miradexio/client test

---

License

MIT. See LICENSE.