diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -721,6 +721,7 @@ API | Description | Auth | HTTPS | CORS |
 | [OpenFIGI](https://www.openfigi.com/api) | Equity, index, futures, options symbology from Bloomberg LP | `apiKey` | Yes | Yes |
 | [Plaid](https://plaid.com/) | Connect with user's bank accounts and access transaction data | `apiKey` | Yes | Unknown |
 | [Polygon](https://polygon.io/) | Historical stock market data | `apiKey` | Yes | Unknown |
+| [Portfolio Optimizer](https://portfoliooptimizer.io/) | Portfolio analysis and optimization | No | Yes | Yes |
 | [Razorpay IFSC](https://razorpay.com/docs/) | Indian Financial Systems Code (Bank Branch Codes) | No | Yes | Unknown |
 | [Real Time Finance](https://github.com/Real-time-finance/finance-websocket-API/) | Websocket API to access realtime stock data | `apiKey` | No | Unknown |
 | [SEC EDGAR Data](https://www.sec.gov/edgar/sec-api-documentation) | API to access annual reports of public US companies | No | Yes | Yes |