@ln-markets/api

@ln-markets/api is a simple way to connect your Node JS application to LN Markets !

Install

You can install this package with npm or yarn:

  $> npm install @ln-markets/api

  $> pnpm install @ln-markets/api

  $> yarn add @ln-markets/api

Then go to on your LN Markets account under the API section of the Profile to generate an API Key with the right permissions to fit your needs.

Usage

You can import either use websocket or rest api from @ln-markets/api

⚠️ This module does not work in the browser ⚠️ This package only work with ES Modules

import { createRestClient, createWebsocketClient } from '@ln-markets/api'

REST API

Create a new client with the createRestClient function

import { createRestClient } from '@ln-markets/api'
const client = createRestClient()

All these functions are wrappers for documented public endpoints from LN Markets API v2. See specification here.

You can use the client.request for routes that are not implemented yet.

Configuration

You can pass the network and version to the builder function

By default the package will connect to the mainnet api.

Authentication

For authentication you need your api key secret and passphrase

Without you will not bet able to authenticate and use routes that require authentication

⚠️ Never share your API Key, Secret or Passphrase

• As a js variable

import { createRestClient } from '@ln-markets/api'
const key = `<LNM API KEY>`
const secret = `<LNM API SECRET>`
const passphrase = `<LNM API PASSPHRASE>`

const client = new createRestClient({ key, secret, passphrase })

const trades = await client.futuresGetTrades()
console.log(trades)

• As env variable

// process.env.LNM_API_KEY = `<LNM API KEY>`
// process.env.LNM_API_SECRET = `<LNM API SECRET>`
// process.env.LNM_API_PASSPHRASE = `<LNM API PASSPHRASE>`

const client = new createRestClient({ key, secret })

const trades = await client.futuresGetTrades()
console.log(trades)

Network

import { createRestClient } from '@ln-markets/api'
const client = createRestClient({ network: 'testnet' })

• Pass LNM_API_NETWORK env var to your app

// process.env.LNM_API_NETWORK = 'testnet'
import { createRestClient } from '@ln-markets/api'
const client = createRestClient()

Version

import { createRestClient } from '@ln-markets/api'
const client = createRestClient({ version: 'v42' })

• Pass LNM_API_VERSION env var to your app

// process.env.LNM_API_VERSION = 'v42'
import { createRestClient } from '@ln-markets/api'
const client = createRestClient()

Headers

Add custom headers to your requests

import { createRestClient } from '@ln-markets/api'
const client = createRestClient({
  headers: {
    'X-My-Header': 'My value',
  },
})

Websocket API

⚠️ Websocket API only support subscription

Websocket API is limited now for price and index update.

The message format is using JSON-RPC spec.

import { createWebsocketClient } from '@ln-markets/api'
// Need to be async
const client = await createWebsocketClient()

await client.publicSubscribe([
  'futures:btc_usd:last-price',
  'futures:btc_usd:index',
])

// Event on all response
client.on('response', console.log)
// Event emitter on subscribed channels
client.on('futures:btc_usd:last-price', console.log)
client.on('futures:btc_usd:index', console.log)

// Handle websocket error here
client.ws.on('error', console.error)

Configuration

Network

• Testnet with constructor params

import { createWebsocketClient } from '@ln-markets/api'
const client = createWebsocketClient({ network: 'testnet' })

• Pass LNM_API_NETWORK env var to your app

// process.env.LNM_API_NETWORK = 'testnet'
import { createWebsocketClient } from '@ln-markets/api'
const client = createWebsocketClient()

Version

import { createWebsocketClient } from '@ln-markets/api'
const client = createWebsocketClient({ version: 'v42' })

• Pass LNM_API_VERSION env var to your app

// process.env.LNM_API_VERSION = 'v42'
import { createWebsocketClient } from '@ln-markets/api'
const client = createWebsocketClient()

HearthBeat

Default to true will send a ping every 5s to the server to keep the connection alive.

import { createWebsocketClient } from '@ln-markets/api'
const client = createWebsocketClient({ heartbeat: false })