CoinMarketCap

A Python implementation of CoinMarketCap's V1 API.

You need an API key from CoinMarketCap to use their API, you can get a key from here. Due to the low request rate, I recommend you to test your application in their sandbox environment. You need a different API key when using their sandbox environment that you can get from here.

Installing

python3 -m pip install CoinMarketCapAPI

Authentication

If no keys are provided during init, the module will look for a JSON file in $HOME/.coinmarketcap.json, with the following syntax.

{
  "sandbox": "API_KEY",
  "production": "API_KEY"
}

Alternatively, you can set your keys as OS environment variables. In .bashrc, add the following two lines.

export COINMARKETCAP_SANDBOX="API_KEY"
export COINMARKETCAP_PRODUCTION="API_KEY"

Examples

Init client with an API Key.

from coinmarketcap import Client

key = "API_KEY"
client = Client(apikey=key)

The following example shows how you can access and send a request to each of CoinMarketCap's endpoint (cryptocurrency, exchange, global_metrics, tools). Notice plural and singular method endings. Plurals allow a list of id, symbol or slug, singular allows only a single value.

from coinmarketcap import Client
from datetime import datetime

# Init sandbox client.
client = Client(sandbox=True)

# fetch cryptocurrency info
client.cryptocurrency.info.symbols(["BTC", "ETH"])
client.cryptocurrency.info.ids(1)

# fetch exchange info
client.exchange.info.slugs("binance")
client.exchange.info.ids([1, 4])

# fetch global market data
time = datetime.strptime("2018-12-21", "%Y-%m-%d")
client.global_metrics.quotes.latest()
client.global_metrics.quotes.historical(time_start=time)

amount_1 = 100.4
amount_2 = "901.23"
id = 4
# convert price historic price
client.tools.price.convert_id(amount_1, id, time=time)
client.tools.price.convert_symbol(amount_2, "BTC", convert=["USD", "ETH"])

Due to CoinMarketCap's credit and rate limit system, implementing a proper request throttler is complex. Anyway, I tried to apply three different levels of throttling. "minute", "daily", "monthly". Each level makes sure you don't exceed your request limit.

from coinmarketcap import Client
# By default throttling of requests are off.
# Ignore the Client's keyword arguments "throttle", "plan", and "block" if
# you don't want the client to throttle requests.  

# client_1 will not exceed the number of request each minute with the basic plan.
client_1 = Client(throttle="minute", plan="basic")

# client_2 will not exceed the daily request limit.
client_2 = Client(throttle="daily", block=True, plan="hobbyist")

# client_3 will never exceeded CoinMarketCap monthly request rate.
client_3 = Client(throttle="monthly", block=False, plan="professional")

Each request is cached, the expiration time of data can be adjusted with the keyword argument expire. Set expire=0 if don't want any cached data.

from coinmarketcap import Client
# cached request will be removed after a second.
client = Client(expire=1)

# cached request will be removed after an hour
client = Client(expire=3600)

# To remove all data from the cache, use the method clear_cache
client.clear_cache()

TODO

• Enable Proper throttling of requests.
• Testing in different python versions.

This is my first python module. So, I appreciate any feedback :)