diff --git a/README.md b/README.md
index ade44e71..1f4b2312 100644
--- a/README.md
+++ b/README.md
@@ -836,6 +836,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Cloverly](https://www.cloverly.com/carbon-offset-documentation) | API calculates the impact of common carbon-intensive activities in real time | `apiKey` | Yes | Unknown |
 | [CO2 Offset](https://co2offset.io/api.html) | API calculates and validates the carbon footprint | No | Yes | Unknown |
 | [Danish data service Energi](https://www.energidataservice.dk/) | Open energy data from Energinet to society | No | Yes | Unknown |
+| [gridcarbon](https://gridcarbon.dev) | Hourly grid carbon intensity in gCO2eq/kWh for 45 zones in Europe, the US and Great Britain | No | Yes | Yes |
 | [GrünstromIndex](https://gruenstromindex.de/) | Green Power Index for Germany (Grünstromindex/GSI) | No | No | Yes |
 | [IQAir](https://www.iqair.com/air-pollution-data-api) | Air quality and weather data | `apiKey` | Yes | Unknown |
 | [kanari](https://kanari.io/en/api) | Real-time worldwide wildfire detections, water bomber tracking and open fire archive | No | Yes | Yes |