Which cryptocurrency exchanges have a stable API?

Question

bitcoin

Actually, you need to tie crypto rates to the trading platform, which exchange API to choose?

Answer 1

Of course, the one through which you convert to fiat at the time of payment.
If you don't, i.e. keep the cryptocurrency until you are blue in the face, then choose the exchange where the rate is the lowest, i.e. collect a course from all popular ones.
data.bitcoinity.org/markets/arbitrage/USD
As far as I understand, all trading platforms take a course not from exchanges, but from their trading bots, which ensure the exchange of incoming cryptocurrencies into fiat or another exchange, if required by the same investors/partners using this platform to obtain liquidity.
If you need not only a one-way exchange (cryptocurrency -> fiat), then in this case you will need to build your own index. Let me remind you that there is no single rate, it is different not only for different buy and sell directions, but also for the corresponding volumes, even a deal for a simple thousand bucks can change the rate compared to one buck by tenths of a percent, if the market at that moment decided to twitch sharply.
ps real rates on localbitcoins, because there is an exchange for the most liquid money (bank account or even cash), and on ordinary exchanges, the rate is multiplied by an abstraction, which is influenced by the algorithm of its market maker (which simulates trading, since these are unregulated markets, there what centrals don’t do) the commission for the input and output of the exchange and the risks of delays in this. But on the local you will come across the fact that even rubles are different, and the difference is in percentages .. for example, kiwi is cheaper than Sberbank, and Tinkoff is more expensive.