XRPL-Labs/XRP-Price-Aggregator

Fetches XRP (USD) prices from multiple data sources, filters out based on stdev

XRP Price Aggregator

Fetches XRP (USD) prices from multiple data sources, filters out values based on stdev. Data providers are called in parallel, after which a number of requests (possibly: retries) are being executed with a delay per request.

Background info: https://dev.to/wietse/aggregated-xrp-usd-price-info-on-the-xrp-ledger-1087

The default values:

• 3 calls per dataprovider
  Override env.: ORACLE_PROVIDER_CALL_COUNT=..
• 2 second delay per request
  Override env.: ORACLE_PROVIDER_CALL_DELAY_SEC=..

Data sources

• Binance
• Bitfinex
• Bitstamp
• Cryptowatch
• HitBTC
• Kraken

Config

This code looks for environment vars, eg. the Cryptowatch provider requires an API key. See /.env.sample for required env. vars, and copy .env.sample to .env.

Logging

Run with DEBUG=oracle* (prefixed) to read debug output. This is automatically prepended when running npm run dev.

Output format sample

{
  rawResultsNamed: {
    Cryptowatch: [ 0.26108, 0.26108, 0.26108 ],
    Bitstamp: [ 0.26095 ],
    Kraken: [ 0.26108, 0.26108, 0.26108 ],
    Bitfinex: [ 0.26084, 0.26084, 0.26084 ],
    Hitbtc: [ 0.260529, 0.260529, 0.260529 ],
    Binance: [ 0.2605, 0.26059, 0.26051 ]
  },
  rawResults: [
     0.26108,  0.26108,  0.26108,
     0.26095,  0.26108,  0.26108,
     0.26108,  0.26084,  0.26084,
     0.26084, 0.260529, 0.260529,
    0.260529,   0.2605,  0.26059,
     0.26051
  ],
  rawMedian: 0.26084,
  rawStdev: 0.00024097781763835502,
  filteredResults: [
    0.26108, 0.26108,
    0.26108, 0.26095,
    0.26108, 0.26108,
    0.26108, 0.26084,
    0.26084, 0.26084
  ],
  filteredMedian: 0.26108,
  filteredMean: 0.260995
}