diff --git a/docs/modules/proj4/README.md b/docs/modules/proj4/README.md
index ea483ccc..502155a1 100644
--- a/docs/modules/proj4/README.md
+++ b/docs/modules/proj4/README.md
@@ -36,30 +36,6 @@ There are an infinite number of possible coordinate systems; therefore strict sy
 
 There are thousands of named "EPSG" projections. This module only includes aliases for those in the section below by default. To use a different EPSG projection, you can use https://epsg.io. For example, https://epsg.io/4326 defines standard longitude-latitude coordinates and lists multiple projection strings. Choose one of the `OGC WKT`, `ESRI WKT`, or `PROJ.4` strings listed.
 
-The epsg.io website also has a public API, e.g., for WGS 84: `https://epsg.io/?q=4326&format=json`
-
-```json
-{
-  "status": "ok",
-  "number_result": 1,
-  "results": [
-    {
-      "code": "4326",
-      "kind": "CRS-GEOGCRS",
-      "bbox": [90.0, -180.0, -90.0, 180.0],
-      "wkt": "GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4326\"]]",
-      "unit": "degree (supplier to define representation)",
-      "proj4": "+proj=longlat +datum=WGS84 +no_defs",
-      "name": "WGS 84",
-      "area": "World.",
-      "default_trans": 0,
-      "trans": [],
-      "accuracy": ""
-    }
-  ]
-}
-```
-
 If you already know the EPSG identifier, you can make the API request even simpler by adding the desired extension to your url:
 
 ```
@@ -72,6 +48,39 @@ GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORI
 +proj=longlat +datum=WGS84 +no_defs
 ```
 
+### API
+For searching (without knowing the exact identifier) there was epsg.io API, which transitioned to MapTiler Coordinates API. This API requires obtaining a free API key to use.
+
+Example: `https://api.maptiler.com/coordinates/search/4326.json?key=YOUR_MAPTILER_KEY&exports=true`  
+Response (slightly different from the epsg.io API response):
+
+```json
+{
+  "results": [
+    {
+      "id": {
+        "authority": "EPSG",
+        "code": 4326
+      },
+      "kind": "CRS-GEOGCRS",
+      "name": "WGS 84",
+      "exports": {
+        "proj4": "+proj=longlat +datum=WGS84 +no_defs +type=crs",
+        "wkt": "GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4326\"]]"
+      },
+      "unit": "degree (supplier to define representation)",
+      "accuracy": null,
+      "area": "World",
+      "bbox": [-180, -90, 180, 90],
+      "deprecated": false,
+      "default_transformation": null,
+      "transformations": [3858, 3859, 8037, 9618, 9704, 9706, 9708, 10084, 15781]
+    }
+  ],
+  "total": 1
+}
+```
+
 ### Aliases
 
 Note that Proj4Projection allows aliases to be defined and comes with the following pre-installed aliases.
@@ -87,6 +96,7 @@ Note that Proj4Projection allows aliases to be defined and comes with the follow
 - [OGC WKT-CRS Specification](http://docs.opengeospatial.org/is/18-010r7/18-010r7.html) standards documentation.
 - [spatialreference.org](https://spatialreference.org/) a catalog of coordinate system references.
 - [espg.io](https://epsg.io/) Lets the user look up the definition of a coordinate system.
+- [MapTiler Coordinates API](https://www.maptiler.com/cloud/coordinates-api/) to search coordinate system
 
 E.g. [https://epsg.io/4326](https://epsg.io/4326) provides the definition of WGS84 in WKT-CRS format: