SYNOPSIS

📊 Opinionated, REST-ful API for fetching chart/candle data from a cryptocurrency exchange for an asset or set of assets.

REQUIREMENTS

1. A Google Cloud Account.
2. Billing Enabled.
3. API Access Enabled.
4. gcloud CLI installed and in your $PATH.
5. A preferred configuration created ( gcloud init ).

USAGE

curl https://${DEFAULT_REGION}-${PROJECT}.cloudfunctions.net/api-charts?exchange=binance&asset=btc-ltc&timeframe=1d

Or, if you prefer a POST:

curl https://${DEFAULT_REGION}-${PROJECT}.cloudfunctions.net/api-charts --data '{"exchange": "binance", "asset": "btc-ltc", "timeframe": "1d"}' -H "Content-Type: application/json"

The expected response:

{
  "data": [
    {
      "close": 6.399e-05,
      "high": 6.407e-05,
      "low": 6.387e-05,
      "open": 6.407e-05,
      "timestamp": 1555113600000,
      "volume": 14872
    },
    ...
  }
}

Or in the case there is a failure:

{
  "err": "Timeframe, 3h, not supported on Coinbase."
}

API

# One asset, on Binance, daily timeframe
curl https://${DEFAULT_REGION}-${PROJECT}.cloudfunctions.net/api-charts?exchange=binance&asset=btc-ltc&timeframe=1d

# Three assets, on Binance, hourly timeframe; NOTE: response is an array of objects: {asset: XXX-YYYY, data: [{close, high, low, open, timestamp, volume}...]}
curl https://${DEFAULT_REGION}-${PROJECT}.cloudfunctions.net/api-charts?assets=BTC-LTC,BTC-XRP,USDT-ZEC&exchange=Binance&timeframe=1h

# One asset, on Coinbase, hourly timeframe, with start date in Unix timstamp format in milliseconds
curl https://${DEFAULT_REGION}-${PROJECT}.cloudfunctions.net/api-charts?asset=BTC-XRP&exchange=Coinbase&start=1555116991951000&timeframe=1h

# One asset, on Coinbase, hourly timeframe, with start and end dates in Unix timstamp format in milliseconds
curl https://${DEFAULT_REGION}-${PROJECT}.cloudfunctions.net/api-charts?asset=BTC-XRP&exchange=Coinbase&start=1555116991951000&end=1555119991951000&timeframe=1h

DEPLOY

First, fork or clone this repo, then:

npm i

Now, deploy it GCP, run the following command in the root of this repository:

gcloud functions deploy api-charts --runtime nodejs10 --trigger-http --memory 128MB

You should receive a YAML like response in your terminal including the URL for the Cloud Function.

TESTS

npm i -D
npm test

AUTHORS

• Joe McCann

LICENSE

MIT