crypto-contract-value 1.7.25

Get contract value.
Documentation 
# crypto-contract-value

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The value of an unit of contract diffs in different exchanges, and even in the same exchange it differs in different markets.

For example:

- Each Binance perpetual `BTCUSDT` contract is valued at 100 USD, and each alt coin contract is valued at 10 USD.
- Each OKX `BTC-USDT-SWAP` contract is valued at 0.01 BTC.
- Each OKX `BTC-USD-SWAP` contract is valued at 100 USD.
- The contract value of spot markets is always 1.

Given `quantity`, the number of traded coins/contracts, we can multiply it by `contract_value` to get the total traded coins/USDs.