diff --git a/algorithm_catalog/worldcereal.json b/algorithm_catalog/worldcereal_inference.json
similarity index 98%
rename from algorithm_catalog/worldcereal.json
rename to algorithm_catalog/worldcereal_inference.json
index ef0f51a..55fa17a 100644
--- a/algorithm_catalog/worldcereal.json
+++ b/algorithm_catalog/worldcereal_inference.json
@@ -1,5 +1,5 @@
 {
-  "id": "worldcereal_maize",
+  "id": "worldcereal_inference",
   "type": "Feature",
   "conformsTo": [
     "http://www.opengis.net/spec/ogcapi-records-1/1.0/req/record-core"
diff --git a/qa/tools/apex_algorithm_qa_tools/__init__.py b/qa/tools/apex_algorithm_qa_tools/__init__.py
index f102a9c..7aca9c2 100644
--- a/qa/tools/apex_algorithm_qa_tools/__init__.py
+++ b/qa/tools/apex_algorithm_qa_tools/__init__.py
@@ -1 +1,4 @@
+# TODO: Flatten apex_algorithm_qa_tools to a single module and push as much functionality to https://github.com/ESA-APEx/esa-apex-toolbox-python
+
+
 __version__ = "0.0.1"
diff --git a/qa/tools/apex_algorithm_qa_tools/common.py b/qa/tools/apex_algorithm_qa_tools/common.py
new file mode 100644
index 0000000..3216263
--- /dev/null
+++ b/qa/tools/apex_algorithm_qa_tools/common.py
@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import logging
+from pathlib import Path
+from typing import Iterator
+
+# TODO: Flatten apex_algorithm_qa_tools to a single module and push as much functionality to https://github.com/ESA-APEx/esa-apex-toolbox-python
+
+
+_log = logging.getLogger(__name__)
+
+
+def get_project_root() -> Path:
+    """Try to find project root for common project use cases."""
+
+    def candidates() -> Iterator[Path]:
+        # TODO: support a environment variable to override the project root detection?
+        # Running from project root?
+        yield Path.cwd()
+
+        # Running from qa/tools, qa/benchmarks, qa/unittests?
+        yield Path.cwd().parent.parent
+
+        # Search from current file
+        yield Path(__file__).parent.parent.parent.parent
+
+    for candidate in candidates():
+        if candidate.is_dir() and all(
+            (candidate / p).is_dir()
+            for p in ["algorithm_catalog", "algorithm_invocations", "qa/tools"]
+        ):
+            _log.info(f"Detected project root {candidate!r}")
+            return candidate
+
+    raise RuntimeError("Could not determine algorithm invocations root directory.")
diff --git a/qa/tools/apex_algorithm_qa_tools/usecases.py b/qa/tools/apex_algorithm_qa_tools/usecases.py
index e639a5d..7c19c0b 100644
--- a/qa/tools/apex_algorithm_qa_tools/usecases.py
+++ b/qa/tools/apex_algorithm_qa_tools/usecases.py
@@ -3,16 +3,16 @@
 import dataclasses
 import json
 import logging
-import os
 import re
-from pathlib import Path
 from typing import List
 
 import requests
+from apex_algorithm_qa_tools.common import get_project_root
 
 _log = logging.getLogger(__name__)
 
 
+# TODO: Flatten apex_algorithm_qa_tools to a single module and push as much functionality to https://github.com/ESA-APEx/esa-apex-toolbox-python
 # TODO: rename `algorithm_invocations` and `qa/tools/apex_algorithm_qa_tools/usecases.py` to more descriptive "scenarios" or "benchmark-scenarios"?
 
 
@@ -36,46 +36,11 @@ def from_dict(cls, data: dict) -> UseCase:
         )
 
 
-APEX_ALGORITHM_INVOCATIONS_ROOT = "APEX_ALGORITHM_INVOCATIONS_ROOT"
-
-
-def get_algorithm_invocation_root() -> Path:
-    # TODO: find a better name for "algorithm invocations"?
-    # First attempt: check environment variable
-    if APEX_ALGORITHM_INVOCATIONS_ROOT in os.environ:
-        algo_root = os.environ[APEX_ALGORITHM_INVOCATIONS_ROOT]
-        _log.info(
-            f"Using algorithm invocations root {algo_root!r} (from environment variable {APEX_ALGORITHM_INVOCATIONS_ROOT})"
-        )
-        return Path(algo_root)
-
-    # Next attempts: try to detect project root
-    for project_root_candidate in [
-        # Running from project root?
-        Path.cwd(),
-        # Running from qa/tools, qa/benchmarks, qa/unittests?
-        Path.cwd().parent.parent,
-        # Search from current file
-        Path(__file__).parent.parent.parent.parent,
-    ]:
-        if project_root_candidate.is_dir() and all(
-            (project_root_candidate / p).is_dir()
-            for p in ["algorithm_invocations", "qa/tools"]
-        ):
-            algo_root = project_root_candidate / "algorithm_invocations"
-            _log.info(
-                f"Using algorithm invocations root {algo_root!r} (assuming project root {project_root_candidate!r})"
-            )
-            return algo_root
-
-    raise RuntimeError("Could not determine algorithm invocations root directory.")
-
-
 def get_use_cases() -> List[UseCase]:
     # TODO: instead of flat list, keep original grouping/structure of "algorithm_invocations" files?
     # TODO: check for uniqueness of scenario IDs? Also make this a pre-commit lint tool?
     use_cases = []
-    for path in get_algorithm_invocation_root().glob("*.json"):
+    for path in (get_project_root() / "algorithm_invocations").glob("**/*.json"):
         with open(path) as f:
             data = json.load(f)
         # TODO: support single use case files in addition to listings?
diff --git a/qa/unittests/tests/test_algorithm_catalog.py b/qa/unittests/tests/test_algorithm_catalog.py
new file mode 100644
index 0000000..84b375c
--- /dev/null
+++ b/qa/unittests/tests/test_algorithm_catalog.py
@@ -0,0 +1,23 @@
+import json
+
+import pytest
+from apex_algorithm_qa_tools.common import get_project_root
+
+
+@pytest.mark.parametrize(
+    "path", list((get_project_root() / "algorithm_catalog").glob("**/*.json"))
+)
+def test_lint_algorithm_catalog_json_file(path):
+    data = json.loads(path.read_text())
+
+    assert data["id"] == path.stem
+    assert data["type"] == "Feature"
+    assert (
+        "http://www.opengis.net/spec/ogcapi-records-1/1.0/req/record-core"
+        in data["conformsTo"]
+    )
+
+    assert data["properties"]["type"] == "apex_algorithm"
+
+    assert "udp" in {k["rel"] for k in data["links"]}
+    # TODO more checks
diff --git a/qa/unittests/tests/test_common.py b/qa/unittests/tests/test_common.py
new file mode 100644
index 0000000..d6ad7a7
--- /dev/null
+++ b/qa/unittests/tests/test_common.py
@@ -0,0 +1,5 @@
+from apex_algorithm_qa_tools.common import get_project_root
+
+
+def test_get_project_root():
+    assert get_project_root().is_dir()
diff --git a/qa/unittests/tests/test_openeo_udp.py b/qa/unittests/tests/test_openeo_udp.py
new file mode 100644
index 0000000..0850eb4
--- /dev/null
+++ b/qa/unittests/tests/test_openeo_udp.py
@@ -0,0 +1,17 @@
+import json
+
+import pytest
+from apex_algorithm_qa_tools.common import get_project_root
+
+
+@pytest.mark.parametrize(
+    "path", list((get_project_root() / "openeo_udp").glob("**/*.json"))
+)
+def test_lint_openeo_udp_json_file(path):
+    data = json.loads(path.read_text())
+
+    assert data["id"] == path.stem
+    assert "description" in data
+    assert "parameters" in data
+    assert "process_graph" in data
+    # TODO more checks
diff --git a/qa/unittests/tests/test_usecases.py b/qa/unittests/tests/test_usecases.py
index 5492a18..203bb04 100644
--- a/qa/unittests/tests/test_usecases.py
+++ b/qa/unittests/tests/test_usecases.py
@@ -1,14 +1,5 @@
 import pytest
-from apex_algorithm_qa_tools.usecases import (
-    UseCase,
-    get_algorithm_invocation_root,
-    get_use_cases,
-    lint_usecase,
-)
-
-
-def test_get_algorithm_invocation_root():
-    assert get_algorithm_invocation_root().is_dir()
+from apex_algorithm_qa_tools.usecases import UseCase, get_use_cases, lint_usecase
 
 
 def test_get_use_cases():