diff --git a/README.md b/README.md
index 3a89dd47..d2bc69f2 100644
--- a/README.md
+++ b/README.md
@@ -1706,6 +1706,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Etsy](https://www.etsy.com/developers/documentation/getting_started/api_basics) | Manage shop and interact with listings | `OAuth` | Yes | Unknown |
 | [Flipkart Marketplace](https://seller.flipkart.com/api-docs/FMSAPI.html) | Product listing management, Order Fulfilment in the Flipkart Marketplace | `OAuth` | Yes | Yes |
 | [Lazada](https://open.lazada.com/doc/doc.htm) | Retrieve product ratings and seller performance metrics | `apiKey` | Yes | Unknown |
+| [Marketplace Fee Data](https://www.sellerscalc.com/data) | Seller fee schedules for 21 e-commerce marketplaces and payment processors as JSON | No | Yes | Yes |
 | [Mercadolibre](https://developers.mercadolibre.cl/es_ar/api-docs-es) | Manage sales, ads, products, services and Shops | `apiKey` | Yes | Unknown |
 | [Octopart](https://octopart.com/api/v4/reference) | Electronic part data for manufacturing, design, and sourcing | `apiKey` | Yes | Unknown |
 | [OLX Poland](https://developer.olx.pl/api/doc#section/) | Integrate with local sites by posting, managing adverts and communicating with OLX users | `apiKey` | Yes | Unknown |