Update README.md

Add GetBlock RPC API to the list

README.md

@@ -433,6 +433,7 @@ API | Description | Auth | HTTPS | CORS |
 | [EXMO](https://documenter.getpostman.com/view/10287440/SzYXWKPi) | Cryptocurrencies exchange based in UK | `apiKey` | Yes | Unknown |
 | [FTX](https://docs.ftx.com/) | Complete REST, websocket, and FTX APIs to suit your algorithmic trading needs | `apiKey` | Yes | Yes |
 | [Gateio](https://www.gate.io/api2) | API provides spot, margin and futures trading operations | `apiKey` | Yes | Unknown |
+| [GetBlock](https://getblock.io/) | Instant access to 50+ multiple blockchains | `apiKey` | Yes | Unknown |
 | [Gemini](https://docs.gemini.com/rest-api/) | Cryptocurrencies Exchange | No | Yes | Unknown |
 | [Hirak Exchange Rates](https://rates.hirak.site/) | Exchange rates between 162 currency & 300 crypto currency update each 5 min, accurate, no limits | `apiKey` | Yes | Unknown |
 | [Huobi](https://huobiapi.github.io/docs/spot/v1/en/) | Seychelles based cryptocurrency exchange | `apiKey` | Yes | Unknown |