Add Messari (#2731)

README.md

@@ -372,6 +372,7 @@ API | Description | Auth | HTTPS | CORS |
 | [INFURA Ethereum](https://infura.io/product/ethereum) | Interaction with the Ethereum mainnet and several testnets | `apiKey` | Yes | Yes |
 | [Kraken](https://docs.kraken.com/rest/) | Cryptocurrencies Exchange | `apiKey` | Yes | Unknown |
 | [MercadoBitcoin](https://www.mercadobitcoin.net/api-doc/) | Brazilian Cryptocurrency Information | No | Yes | Unknown |
+| [Messari](https://messari.io/api) | Provides API endpoints for thousands of crypto assets | No | Yes | Unknown |
 | [Nexchange](https://nexchange2.docs.apiary.io/) | Automated cryptocurrency exchange service | No | No | Yes |
 | [Nomics](https://nomics.com/docs/) | Historical and realtime cryptocurrency prices and market data | `apiKey` | Yes | Yes |
 | [NovaDax](https://doc.novadax.com/en-US/#introduction) | NovaDAX API to access all market data, trading management endpoints | `apiKey` | Yes | Unknown |