Exchange Assets

pnpm add @arkade-os/sdk @arkade-os/swap nostr-tools

import { asset } from '@arkade-os/sdk'
import { arkadeAsset, btcOn, createSwapClient, IndexedDbAssetSwapRepository } from '@arkade-os/swap'

const USDT_ID = 'f121ac9b7656797cc68d1e8fecacfbaa2069ec1461edf0bf2f3c37404cb9791a0000' // USDT's asset id on mutinynet

const BTC = btcOn('arkade', 'mutinynet')
const USDT = arkadeAsset('mutinynet', asset.AssetId.fromString(USDT_ID))

const client = createSwapClient({ wallet, repository: new IndexedDbAssetSwapRepository() })
await client.ready

const quote = await client.quote({
  give: BTC,
  take: USDT,
  amount: 100_000n, // sats you give
  amountOn: 'give',
})
console.log(quote.give.amount, quote.take.amount, quote.fee.amount, quote.expiresAt)

const swap = await client.accept(quote) // after the user confirms

const swap = await client.exchange({
  give: BTC,
  take: USDT,
  amount: 100_000n, // sats you give
  amountOn: 'give',
  maxFee: { amount: 50n, asset: USDT }, // 0.50 USDT, at 2 decimals
})

client.onUpdate(({ swap, outcome }) => console.log(swap.id, outcome))

const { outcome } = await client.cancel(swap.id)

const OTHER_ID = '<asset id>' // the 68-character id of the asset you want
const OTHER = arkadeAsset('mutinynet', asset.AssetId.fromString(OTHER_ID))

// Resolves with a swap's final outcome. onUpdate first replays each swap's current outcome.
async function finalOutcome(id: string) {
  let unsubscribe = () => {}
  const outcome = await new Promise<string>((resolve) => {
    unsubscribe = client.onUpdate(({ swap, outcome }) => {
      if (swap.id === id && ['filled', 'cancelled', 'needs_recovery'].includes(outcome)) resolve(outcome)
    })
  })
  unsubscribe()
  return outcome
}

const first = await client.exchange({
  give: USDT,
  take: BTC,
  amount: 3_000n, // 30.00 USDT
  amountOn: 'give',
  maxFee: { amount: 400n, asset: BTC }, // sats
})
if ((await finalOutcome(first.id)) !== 'filled') throw new Error('the first swap did not fill')

const second = await client.exchange({
  give: BTC,
  take: OTHER,
  amount: first.take.amount, // the sats the first swap paid you
  amountOn: 'give',
  maxFee: { amount: 50n, asset: OTHER },
})
console.log(await finalOutcome(second.id)) // 'filled'