diff --git a/README.md b/README.md
index a2708a8..3d9fab3 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,20 @@ The specification is expected to support provider capability discovery instead o
 - Replayability and auditability where supported
 - Language implementations that follow the shared specification
 
+## Supported providers
+
+| Provider                                          | API key requested | API key received | API tested | Supported |
+| ------------------------------------------------- | ----------------- | ---------------- | ---------- | --------- |
+| Atmosfair Webservice 5                            |                   |                  |            |           |
+| Google Travel Impact Model (various versions)     |                   |                  |            |           |
+| myclimate Flight Calculator V1 & V2               |                   |                  |            |           |
+| myclimate Bulk Flight Calculator                  |                   |                  |            |           |
+| GoClimate Flight Footprint                        |                   |                  |            |           |
+| C-Level Carbon Balance API                        |                   |                  |            |           |
+| KlimaLink API                                     |                   |                  |            |           |
+| KlimAPI Calculation & Compensation API (v1 & v2)  |                   |                  |            |           |
+| calco2la.to                                       |                   |                  |            |           |
+
 ## License
 
 The general specification repository is licensed under the GNU Affero General Public License, Version 3 or later.