http api:https://api.coinmarketcap.com/v2/ticker/1765/

{
    "data": {
        "id": 1765, 
        "name": "EOS", 
        "symbol": "EOS", 
        "website_slug": "eos", 
        "rank": 5, 
        "circulating_supply": 906245118, 
        "total_supply": 1006245120, 
        "max_supply": 1000000000, 
        "quotes": {
            "USD": {
                "price": 7.1827637594, 
                "volume_24h": 636473463.658721, 
                "market_cap": 6509344588, 
                "percent_change_1h": -0.09, 
                "percent_change_24h": -1.29, 
                "percent_change_7d": -16.8
            }
        }, 
        "last_updated": 1533193294
    }, 
    "metadata": {
        "timestamp": 1533192860, 
        "error": null
    }
}

https://api.coinmarketcap.com/v1/ticker/${symbol}/?convert=${convert_symbol}
price字段即为当前的EOS USD价格 (具体准确度,自己衡量)
数据来自:github erp