Add 1inch (#2461)

README.md

@@ -309,6 +309,7 @@ API | Description | Auth | HTTPS | CORS |
 ### Cryptocurrency
 API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
+| [1inch](https://docs.1inch.io/api/) | API for querying decentralize exchange | No | Yes | Unknown |
 | [apilayer coinlayer](https://coinlayer.com) | Real-time Crypto Currency Exchange Rates | `apiKey` | Yes | Unknown |
 | [Binance](https://github.com/binance/binance-spot-api-docs) | Exchange for Trading Cryptocurrencies based in China | `apiKey` | Yes | Unknown |
 | [BitcoinAverage](https://apiv2.bitcoinaverage.com/) | Digital Asset Price Data for the blockchain industry | `apiKey` | Yes | Unknown |