diff --git a/tools/spectral/ipa/__tests__/eachCustomMethodMustBeGetOrPost.test.js b/tools/spectral/ipa/__tests__/eachCustomMethodMustBeGetOrPost.test.js
new file mode 100644
index 0000000000..369f61efcd
--- /dev/null
+++ b/tools/spectral/ipa/__tests__/eachCustomMethodMustBeGetOrPost.test.js
@@ -0,0 +1,122 @@
+import testRule from './__helpers__/testRule';
+import { DiagnosticSeverity } from '@stoplight/types';
+
+testRule('xgen-IPA-109-custom-method-must-be-GET-or-POST', [
+  {
+    name: 'valid methods',
+    document: {
+      paths: {
+        '/a/{exampleId}:method': {
+          post: {},
+        },
+        '/a:method': {
+          post: {},
+        },
+        '/b/{exampleId}:method': {
+          get: {},
+        },
+        '/b:method': {
+          get: {},
+        },
+        '/c/{exampleId}:method': {
+          get: {},
+          'x-xgen-IPA-exception': {},
+        },
+        '/c:method': {
+          get: {},
+          'x-xgen-IPA-exception': {},
+        },
+      },
+    },
+    errors: [],
+  },
+  {
+    name: 'invalid methods',
+    document: {
+      paths: {
+        '/a/{exampleId}:method': {
+          put: {},
+        },
+        '/a:method': {
+          put: {},
+        },
+        '/b/{exampleId}:method': {
+          get: {},
+          put: {},
+        },
+        '/b:method': {
+          get: {},
+          put: {},
+        },
+        '/c/{exampleId}:method': {
+          post: {},
+          get: {},
+          put: {},
+        },
+        '/c:method': {
+          post: {},
+          get: {},
+          put: {},
+        },
+        '/d/{exampleId}:method': {
+          post: {},
+          get: {},
+        },
+        '/d:method': {
+          post: {},
+          get: {},
+        },
+      },
+    },
+    errors: [
+      {
+        code: 'xgen-IPA-109-custom-method-must-be-GET-or-POST',
+        message: 'The HTTP method for custom methods must be GET or POST. http://go/ipa/109',
+        path: ['paths', '/a/{exampleId}:method'],
+        severity: DiagnosticSeverity.Warning,
+      },
+      {
+        code: 'xgen-IPA-109-custom-method-must-be-GET-or-POST',
+        message: 'The HTTP method for custom methods must be GET or POST. http://go/ipa/109',
+        path: ['paths', '/a:method'],
+        severity: DiagnosticSeverity.Warning,
+      },
+      {
+        code: 'xgen-IPA-109-custom-method-must-be-GET-or-POST',
+        message: 'The HTTP method for custom methods must be GET or POST. http://go/ipa/109',
+        path: ['paths', '/b/{exampleId}:method'],
+        severity: DiagnosticSeverity.Warning,
+      },
+      {
+        code: 'xgen-IPA-109-custom-method-must-be-GET-or-POST',
+        message: 'The HTTP method for custom methods must be GET or POST. http://go/ipa/109',
+        path: ['paths', '/b:method'],
+        severity: DiagnosticSeverity.Warning,
+      },
+      {
+        code: 'xgen-IPA-109-custom-method-must-be-GET-or-POST',
+        message: 'The HTTP method for custom methods must be GET or POST. http://go/ipa/109',
+        path: ['paths', '/c/{exampleId}:method'],
+        severity: DiagnosticSeverity.Warning,
+      },
+      {
+        code: 'xgen-IPA-109-custom-method-must-be-GET-or-POST',
+        message: 'The HTTP method for custom methods must be GET or POST. http://go/ipa/109',
+        path: ['paths', '/c:method'],
+        severity: DiagnosticSeverity.Warning,
+      },
+      {
+        code: 'xgen-IPA-109-custom-method-must-be-GET-or-POST',
+        message: 'The HTTP method for custom methods must be GET or POST. http://go/ipa/109',
+        path: ['paths', '/d/{exampleId}:method'],
+        severity: DiagnosticSeverity.Warning,
+      },
+      {
+        code: 'xgen-IPA-109-custom-method-must-be-GET-or-POST',
+        message: 'The HTTP method for custom methods must be GET or POST. http://go/ipa/109',
+        path: ['paths', '/d:method'],
+        severity: DiagnosticSeverity.Warning,
+      },
+    ],
+  },
+]);
diff --git a/tools/spectral/ipa/ipa-spectral.yaml b/tools/spectral/ipa/ipa-spectral.yaml
index a948e1c544..789367fc96 100644
--- a/tools/spectral/ipa/ipa-spectral.yaml
+++ b/tools/spectral/ipa/ipa-spectral.yaml
@@ -1,4 +1,5 @@
 extends:
+  - ./rulesets/IPA-005.yaml
   - ./rulesets/IPA-102.yaml
   - ./rulesets/IPA-104.yaml
-  - ./rulesets/IPA-005.yaml
+  - ./rulesets/IPA-109.yaml
diff --git a/tools/spectral/ipa/rulesets/IPA-109.yaml b/tools/spectral/ipa/rulesets/IPA-109.yaml
new file mode 100644
index 0000000000..48c1645e07
--- /dev/null
+++ b/tools/spectral/ipa/rulesets/IPA-109.yaml
@@ -0,0 +1,14 @@
+# IPA-109: Custom Methods
+# http://go/ipa/109
+
+functions:
+  - eachCustomMethodMustBeGetOrPost
+
+rules:
+  xgen-IPA-109-custom-method-must-be-GET-or-POST:
+    description: 'The HTTP method for custom methods must be GET or POST. http://go/ipa/109'
+    message: '{{error}} http://go/ipa/109'
+    severity: warn
+    given: '$.paths[*]'
+    then:
+      function: 'eachCustomMethodMustBeGetOrPost'
diff --git a/tools/spectral/ipa/rulesets/functions/eachCustomMethodMustBeGetOrPost.js b/tools/spectral/ipa/rulesets/functions/eachCustomMethodMustBeGetOrPost.js
new file mode 100644
index 0000000000..bb7be025da
--- /dev/null
+++ b/tools/spectral/ipa/rulesets/functions/eachCustomMethodMustBeGetOrPost.js
@@ -0,0 +1,29 @@
+import { isCustomMethod } from './utils/resourceEvaluation.js';
+
+const ERROR_MESSAGE = 'The HTTP method for custom methods must be GET or POST.';
+const ERROR_RESULT = [{ message: ERROR_MESSAGE }];
+const VALID_METHODS = ['get', 'post'];
+const HTTP_METHODS = ['get', 'put', 'post', 'delete', 'options', 'head', 'patch', 'trace'];
+
+export default (input, opts, { path }) => {
+  // Extract the path key (e.g., '/a/{exampleId}:method') from the JSONPath.
+  let pathKey = path[1];
+
+  if (!isCustomMethod(pathKey)) return;
+
+  //Extract the keys which are equivalent of the http methods
+  let keys = Object.keys(input);
+  const httpMethods = keys.filter((key) => HTTP_METHODS.includes(key));
+
+  // Check for invalid methods
+  if (httpMethods.some((method) => !VALID_METHODS.includes(method))) {
+    return ERROR_RESULT;
+  }
+
+  // Check for multiple valid methods
+  const validMethodCount = httpMethods.filter((method) => VALID_METHODS.includes(method)).length;
+
+  if (validMethodCount > 1) {
+    return ERROR_RESULT;
+  }
+};