Add Chainlink

README.md

@@ -189,9 +189,9 @@ API | Description | Auth | HTTPS | CORS |
 ### Blockchain
 API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
+| [Chainlink](https://chain.link/developer-resources) | Build hybrid smart contracts with Chainlink | No | Yes | Unknown |
 | [Covalent](https://www.covalenthq.com/docs/api/) | Multi-blockchain data aggregator platform | `apiKey` | Yes | Unknown |
 
-
 **[⬆ Back to Index](#index)**
 ### Books
 API | Description | Auth | HTTPS | CORS |