loan-manager

Loan-manager automates positioning virtual and fiat currency loan offers on exchanges based on configured strategies. It runs regularly reading active loans, open loan offers and the lendbook for each currency on each exchange creating and updating loan offers based on the selected and configured strategy.

Supported Exchanges

• Bitfinex
• Poloniex

Setup

Clone this project

git clone https://github.com/anders94/loan-manager.git

Install dependancies

npm install

Generate API Keys

Generate keys on the exchanges you want managed. When creating Bitfinex keys, make sure "margin funding" has "write" capability. Poloniex keys don't require special access grants although an IP access list can be configured.

Make sure there are funds available in the lending wallets. On Bitfinex, the lending wallet is the "deposit wallet".

Copy the Configuration Example

cp config/index-example.js config/index.js

Edit the configuration file

Edit config/index.js adding the keys and secrets to the exchange sections. Modify and add sections as necessary for each exchange / currency you wish to lend. Be sure to closely follow the example configuration; loan-manager doesn't deal well with configuration errors.

Main configuration settings

• loopDelayInMinutes: Time in minutes between each run of the logic
• msDelayBetweenAPICalls: Time in milliseconds between API calls. Exchanges usually limit the number of calls that can be made from the same IP / account.

Exchange specific configuration settings

• credentials: key and secret API settings from the exchange - these can also be passed as environment variables
• active: this true or false turns loan management on or off for this currency
• duration: configures the offered loan's duration (in days)
  • minimumDuration: the minimum number of days offered loans will have - usually 2 and limited by the exchange
  • maximumDuration: the maximum number of days offered loans will have - usually 30 or 60 and limited by the exchange
  • lowThreshold: the percentage rate below which offered loans will be set to the minimumDuration
  • highThreshold: the percentage rate above which offered loans will be set to the maximumDuration
• minimumRate: minimum percentage rate below which loan-manager will not create loan offers
• minimumSizeUSD: the value in US Dollars of the minimum loan amount. Exchanges have a lower limit on the amount of currency that can be offered in a single offer.
• maximumSizeUSD: the value in US Dollars of the maximum loan amount. Use this if you want to limit the upper bounds of what the loan-manager will offer in a single offer.
• rateCreationStrategy: names and configures the strategy to be used when creating loans. Valid names include topOfTheBook, staticRate and percentDepth.
  • topOfTheBook: Positions offers at the same rate as the top offer in the book. No other parameters are necessary.
  • staticRate: Requires rate which describes the interest rate
  • percentDepth: Requires lendbookPositioningPercentage which describes how deep into the book to position the offer. For example, 10 would position the offers at whatever rate is 10% into the book by volume.
• rateUpdateStrategy: names and configures the strategy to be used when evaluating open loan offers. Valid names include outOfRange and lowerRateWithTime.
  • outOfRange: Requires driftPercent. If an offer is more than driftPercent above the target rate, cancel the offer.
  • lowerRateWithTime: Requires lowerAfterMinutes and lowerByPercent. If an offer is older than lowerAfterMinutes, lower the offer's rate by lowerByPercent. For example, if lowerByPercent is set to 10, an offer at 5.85% will be lowered by 10% to 5.256%.

Run the application

node app

The application will run in the foreground positioning loans using all available funds in the lending wallets. After running through each exchange and currency, loan-manager will wait the loopDelayInMinutes time and start over again continuously.

Example Output

-----------------------------------
Tue Sep 13 2016 15:46:35 GMT-0400 (EDT)
-----------------------------------

bitfinex eth
  usd rate: $12.01

  active loans (7)
    8.03161070 eth ($96.50) at 26.99% 2016-09-13T12:46:53-04:00 for 10 days (expires in 9.88 days)
    8.96001335 eth ($107.65) at 27.02% 2016-09-13T12:52:55-04:00 for 10 days (expires in 9.88 days)
    0.97693109 eth ($11.74) at 27.02% 2016-09-13T12:52:55-04:00 for 10 days (expires in 9.88 days)
    22.42226187 eth ($269.40) at 26.82% 2016-09-13T12:42:55-04:00 for 10 days (expires in 9.87 days)
    19.97951998 eth ($240.05) at 27.00% 2016-09-13T13:38:54-04:00 for 10 days (expires in 9.91 days)
    4.95182119 eth ($59.50) at 27.25% 2016-09-13T14:26:54-04:00 for 10 days (expires in 9.94 days)
    0.73261049 eth ($8.80) at 27.25% 2016-09-13T14:26:54-04:00 for 10 days (expires in 9.94 days)

    total: 66.05476867 eth ($793.32) at 27.01%

  target rate: 35.18%

  open loan offers (2)
    7.83295780 eth ($94.07) at 35.18% 2016-09-13T15:35:22-04:00 for 2 days
    9.13501705 eth ($109.71) at 35.18% 2016-09-13T15:40:25-04:00 for 2 days

  available balance: 0 eth ($0.00)

  not creating a new offer

bitfinex etc
  usd rate: $1.30

  active loans (6)
    154.09189602 etc ($200.33) at 70.12% 2016-09-04T20:20:16-04:00 for 10 days (expires in 1.19 days)
    12.06334878 etc ($15.68) at 70.12% 2016-09-04T21:00:17-04:00 for 10 days (expires in 1.22 days)
    27.89596296 etc ($36.27) at 67.06% 2016-09-09T16:24:55-04:00 for 30 days (expires in a month)
    21.17597233 etc ($27.53) at 67.06% 2016-09-09T16:30:56-04:00 for 30 days (expires in a month)
    38.93296000 etc ($50.62) at 36.46% 2016-09-13T10:28:56-04:00 for 30 days (expires in a month)
    80.46133283 etc ($104.61) at 36.46% 2016-09-13T10:32:53-04:00 for 30 days (expires in a month)

    total: 334.62147292 etc ($435.01) at 64.40%

  target rate: 27.10%

  available balance: 0 etc ($0.00)

  not creating a new offer

poloniex btc
  usd rate: $616.28

  active loans (7)
    0.30769988 btc ($189.63) at 24.16% 2016-09-13T10:21:19-04:00 for 2 days (expires in 1.77 days)
    0.29442223 btc ($181.45) at 25.44% 2016-09-13T07:31:21-04:00 for 10 days (expires in 9.66 days)
    0.55750000 btc ($343.58) at 24.78% 2016-09-13T05:55:07-04:00 for 2 days (expires in 1.59 days)
    0.30859286 btc ($190.18) at 24.78% 2016-09-13T05:55:04-04:00 for 2 days (expires in 1.59 days)
    0.20912275 btc ($128.88) at 19.16% 2016-09-04T14:27:20-04:00 for 60 days (expires in 1.69 months)
    0.52476103 btc ($323.40) at 25.18% 2016-09-01T13:49:26-04:00 for 60 days (expires in 1.59 months)
    0.34513618 btc ($212.70) at 24.24% 2016-08-24T21:13:07-04:00 for 60 days (expires in 1.34 months)

    total: 2.54723493 btc ($1,569.81) at 24.23%

  target rate: 24.53%

  available balance: 0 btc ($0.00)

  not creating a new offer

summary
  grand total: $2,798.48 loaned at 31.26%

done

FAQ

Q: Because interest is compounded daily, isn't multiplying the daily rate by 365 to get the yearly rate incorrect?

A: Yes. More correctly we would raise the daily rate plus one to the 365th power but as you don't ever hold a loan for an entire year, we more closely approximate the actual rate by simply multiplying the daily rate by 365.

Support the Project

BTC: 1FwVYgQCN5oDvbZCQrE3KwgkBECJ93kF5x