Bitfinex WSv2 Trading API for Node.JS - Bitcoin, Ethereum, Ripple and more

A Node.JS reference implementation of the Bitfinex API

Features

• Official implementation
• REST v2 API
• WebSockets v2 API
• WebSockets v1 API

Installation

  npm i --save bitfinex-api-node

Quickstart

const { WSv2 } = require('bitfinex-api-node')
const ws = new WSv2({ transform: true })

// do something with ws client

Docs

Refer to the docs/ folder for JSDoc-generated HTML documentation, and the examples/ folder for executable examples covering common use cases.

Official API documentation at https://docs.bitfinex.com/v2/reference

Examples

Sending an order & tracking status:

const ws = bfx.ws()

ws.on('error', (err) => console.log(err))
ws.on('open', ws.auth.bind(ws))

ws.once('auth', () => {
  const o = new Order({
    cid: Date.now(),
    symbol: 'tETHUSD',
    amount: 0.1,
    type: Order.type.MARKET
  }, ws)

  // Enable automatic updates
  o.registerListeners()

  o.on('update', () => {
    console.log(`order updated: ${o.serialize()}`)
  })

  o.on('close', () => {
    console.log(`order closed: ${o.status}`)
    ws.close()
  })

  o.submit().then(() => {
    console.log(`submitted order ${o.id}`)
  }).catch((err) => {
    console.error(err)
    ws.close()
  })
})

ws.open()

Cancel all open orders

const ws = bfx.ws(2)

ws.on('error', (err) => console.log(err))
ws.on('open', ws.auth.bind(ws))

ws.onOrderSnapshot({}, (orders) => {
  if (orders.length === 0) {
    console.log('no open orders')
    return
  }

  console.log(`recv ${orders.length} open orders`)

  ws.cancelOrders(orders).then(() => {
    console.log('cancelled orders')
  })
})

ws.open()

Subscribe to trades by pair

const ws = bfx.ws(2)

ws.on('error', (err) => console.log(err))
ws.on('open', () => {
  ws.subscribeTrades('BTCUSD')
})

ws.onTrades({ symbol: 'tBTCUSD' }, (trades) => {
  console.log(`trades: ${JSON.stringify(trades)}`)
})
ws.onTradeEntry({ symbol: 'tBTCUSD' }, (trades) => {
  console.log(`te: ${JSON.stringify(trades)}`)
})

ws.open()

Version 2.0.0 Breaking changes

constructor takes only an options object now, including the API keys

Old:

new BFX(API_KEY, API_SECRET, { version: 2 })

since 2.0.0:

new BFX({ apiKey: '', apiSecret: '' })

trade and orderbook snapshots are emitted as nested lists

To make dealing with snapshots better predictable, snapshots are emitted as an array.

normalized orderbooks for R0

Lists of raw orderbooks (R0) are ordered in the same order as P0, P1, P2, P3

Testing

npm test

FAQ

Order Creation Limits

The base limit per-user is 1,000 orders per 5 minute interval, and is shared between all account API connections. It increases proportionally to your trade volume based on the following formula:

1000 + (TOTAL_PAIRS_PLATFORM * 60 * 5) / (250000000 / USER_VOL_LAST_30d)

Where TOTAL_PAIRS_PLATFORM is the number of pairs shared between Ethfinex/Bitfinex (currently ~101) and USER_VOL_LAST_30d is in USD.

'on' Packet Guarantees

No; if your order fills immediately, the first packet referencing the order will be an oc signaling the order has closed. If the order fills partially immediately after creation, an on packet will arrive with a status of PARTIALLY FILLED...

For example, if you submit a LIMIT buy for 0.2 BTC and it is added to the order book, an on packet will arrive via ws2. After a partial fill of 0.1 BTC, an ou packet will arrive, followed by a final oc after the remaining 0.1 BTC fills.

On the other hand, if the order fills immediately for 0.2 BTC, you will only receive an oc packet.

Nonce too small

I make multiple parallel request and I receive an error that the nonce is too small. What does it mean?

Nonces are used to guard against replay attacks. When multiple HTTP requests arrive at the API with the wrong nonce, e.g. because of an async timing issue, the API will reject the request.

If you need to go parallel, you have to use multiple API keys right now.

te vs tu Messages

A te packet is sent first to the client immediately after a trade has been matched & executed, followed by a tu message once it has completed processing. During times of high load, the tu message may be noticably delayed, and as such only the te message should be used for a realtime feed.

Sequencing

If you enable sequencing on v2 of the WS API, each incoming packet will have a public sequence number at the end, along with an auth sequence number in the case of channel 0 packets. The public seq numbers increment on each packet, and the auth seq numbers increment on each authenticated action (new orders, etc). These values allow you to verify that no packets have been missed/dropped, since they always increase monotonically.

Differences Between R and P Order Books

Order books with precision R0 are considered 'raw' and contain entries for each order submitted to the book, whereas P* books contain entries for each price level (which aggregate orders).

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request