diff --git a/.gitignore b/.gitignore
index 4172015..5af56c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -61,6 +61,10 @@ coverage
 /demo/*.json
 !demo/apis.json
 !demo/grpc-test.json
+!demo/async30.json
+!demo/async30-compact.json
+!demo/async31.json
+!demo/async31-compact.json
 
 .idea
 .codegenie
\ No newline at end of file
diff --git a/demo/async30-compact.json b/demo/async30-compact.json
new file mode 100644
index 0000000..dde77f0
--- /dev/null
+++ b/demo/async30-compact.json
@@ -0,0 +1 @@
+{"@graph":[{"@id":"amf://id#1","@type":["http://a.ml/vocabularies/document#APIContractProcessingData"],"http://a.ml/vocabularies/apiContract#modelVersion":"3.11.0","http://a.ml/vocabularies/document#transformed":true,"http://a.ml/vocabularies/document#sourceSpec":"ASYNC 3.0"},{"@id":"amf://id#2","@type":["http://a.ml/vocabularies/apiContract#AsyncAPI","http://a.ml/vocabularies/apiContract#API","http://a.ml/vocabularies/document#RootDomainElement","http://a.ml/vocabularies/document#DomainElement"],"http://a.ml/vocabularies/apiContract#topLevelOperations":[{"@id":"amf://id#12"}],"http://a.ml/vocabularies/core#name":"AsyncAPI 3.0 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\ No newline at end of file
diff --git a/demo/async30.json b/demo/async30.json
new file mode 100644
index 0000000..843798d
--- /dev/null
+++ b/demo/async30.json
@@ -0,0 +1,769 @@
+{
+"@graph": [
+{
+"@id": "amf://id#1",
+"@type": [
+"http://a.ml/vocabularies/document#APIContractProcessingData"
+],
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+"http://a.ml/vocabularies/document#transformed": true,
+"http://a.ml/vocabularies/document#sourceSpec": "ASYNC 3.0"
+},
+{
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+"@type": [
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+"http://a.ml/vocabularies/apiContract#API",
+"http://a.ml/vocabularies/document#RootDomainElement",
+"http://a.ml/vocabularies/document#DomainElement"
+],
+"http://a.ml/vocabularies/apiContract#topLevelOperations": [
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+"@id": "amf://id#12"
+}
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+"http://a.ml/vocabularies/core#version": "1.0.0",
+"http://a.ml/vocabularies/apiContract#endpoint": [
+{
+"@id": "amf://id#3"
+}
+],
+"http://a.ml/vocabularies/document-source-maps#sources": [
+{
+"@id": "amf://id#2/source-map"
+}
+]
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+"http://a.ml/vocabularies/core#Operation",
+"http://a.ml/vocabularies/document#DomainElement"
+],
+"http://a.ml/vocabularies/core#name": "sendUserSignedUp",
+"http://a.ml/vocabularies/apiContract#operationId": "sendUserSignedUp",
+"http://a.ml/vocabularies/apiContract#action": "send",
+"http://a.ml/vocabularies/apiContract#channel": {
+"@id": "amf://id#13"
+},
+"http://a.ml/vocabularies/apiContract#operationMessages": [
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+"@id": "amf://id#4"
+}
+],
+"http://a.ml/vocabularies/document-source-maps#sources": [
+{
+"@id": "amf://id#12/source-map"
+}
+]
+},
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+"@id": "amf://id#3",
+"@type": [
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+"http://a.ml/vocabularies/document#DomainElement"
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+"http://a.ml/vocabularies/apiContract#path": "user.signedup",
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+"http://a.ml/vocabularies/apiContract#supportedOperation": [
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+],
+"http://a.ml/vocabularies/apiContract#server": [],
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+"@type": [
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+"@id": "amf://id#2/source-map/lexical/element_0"
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+]
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+"http://a.ml/vocabularies/apiContract#server": [],
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+"http://a.ml/vocabularies/apiContract#payload": [
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+}
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+]
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+{
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+],
+"http://a.ml/vocabularies/document-source-maps#lexical": [
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+{
+"@id": "amf://id#3/source-map/lexical/element_2"
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+}
+}
+]
+}
diff --git a/demo/async31-compact.json b/demo/async31-compact.json
new file mode 100644
index 0000000..87f2605
--- /dev/null
+++ b/demo/async31-compact.json
@@ -0,0 +1 @@
+{"@graph":[{"@id":"amf://id#1","@type":["http://a.ml/vocabularies/document#APIContractProcessingData"],"http://a.ml/vocabularies/apiContract#modelVersion":"3.11.0","http://a.ml/vocabularies/document#transformed":true,"http://a.ml/vocabularies/document#sourceSpec":"ASYNC 3.1"},{"@id":"amf://id#2","@type":["http://a.ml/vocabularies/apiContract#AsyncAPI","http://a.ml/vocabularies/apiContract#API","http://a.ml/vocabularies/document#RootDomainElement","http://a.ml/vocabularies/document#DomainElement"],"http://a.ml/vocabularies/apiContract#topLevelOperations":[{"@id":"amf://id#12"}],"http://a.ml/vocabularies/core#name":"AsyncAPI 3.1 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\ No newline at end of file
diff --git a/demo/async31.json b/demo/async31.json
new file mode 100644
index 0000000..adaf303
--- /dev/null
+++ b/demo/async31.json
@@ -0,0 +1,751 @@
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+"@type": [
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+],
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+"http://a.ml/vocabularies/document#transformed": true,
+"http://a.ml/vocabularies/document#sourceSpec": "ASYNC 3.1"
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+"http://a.ml/vocabularies/document#DomainElement"
+],
+"http://a.ml/vocabularies/apiContract#topLevelOperations": [
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+}
+],
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+"http://a.ml/vocabularies/core#version": "1.0.0",
+"http://a.ml/vocabularies/apiContract#endpoint": [
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+"@type": [
+"http://a.ml/vocabularies/shapes#ScalarShape",
+"http://a.ml/vocabularies/shapes#AnyShape",
+"http://www.w3.org/ns/shacl#Shape",
+"http://a.ml/vocabularies/shapes#Shape",
+"http://a.ml/vocabularies/document#DomainElement"
+],
+"http://www.w3.org/ns/shacl#datatype": [
+{
+"@id": "http://a.ml/vocabularies/shapes#number"
+}
+],
+"http://www.w3.org/ns/shacl#name": "timestamp",
+"http://a.ml/vocabularies/document-source-maps#sources": [
+{
+"@id": "amf://id#10/source-map"
+}
+]
+},
+{
+"@id": "amf://id#9/source-map",
+"@type": [
+"http://a.ml/vocabularies/document-source-maps#SourceMap"
+],
+"http://a.ml/vocabularies/document-source-maps#synthesized-field": [
+{
+"@id": "amf://id#9/source-map/synthesized-field/element_0"
+}
+],
+"http://a.ml/vocabularies/document-source-maps#lexical": [
+{
+"@id": "amf://id#9/source-map/lexical/element_0"
+}
+]
+},
+{
+"@id": "amf://id#6/source-map/synthesized-field/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "http://www.w3.org/ns/shacl#closed",
+"http://a.ml/vocabularies/document-source-maps#value": "true"
+},
+{
+"@id": "amf://id#6/source-map/type-property-lexical-info/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "amf://id#6",
+"http://a.ml/vocabularies/document-source-maps#value": "[(15,10)-(15,14)]"
+},
+{
+"@id": "amf://id#6/source-map/lexical/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "amf://id#6",
+"http://a.ml/vocabularies/document-source-maps#value": "[(14,8)-(22,0)]"
+},
+{
+"@id": "amf://id#8/source-map",
+"@type": [
+"http://a.ml/vocabularies/document-source-maps#SourceMap"
+],
+"http://a.ml/vocabularies/document-source-maps#lexical": [
+{
+"@id": "amf://id#8/source-map/lexical/element_1"
+},
+{
+"@id": "amf://id#8/source-map/lexical/element_0"
+}
+],
+"http://a.ml/vocabularies/document-source-maps#type-property-lexical-info": [
+{
+"@id": "amf://id#8/source-map/type-property-lexical-info/element_0"
+}
+]
+},
+{
+"@id": "amf://id#7/source-map/synthesized-field/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "http://www.w3.org/ns/shacl#minCount",
+"http://a.ml/vocabularies/document-source-maps#value": "true"
+},
+{
+"@id": "amf://id#7/source-map/lexical/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "amf://id#7",
+"http://a.ml/vocabularies/document-source-maps#value": "[(17,12)-(19,0)]"
+},
+{
+"@id": "amf://id#10/source-map",
+"@type": [
+"http://a.ml/vocabularies/document-source-maps#SourceMap"
+],
+"http://a.ml/vocabularies/document-source-maps#lexical": [
+{
+"@id": "amf://id#10/source-map/lexical/element_1"
+},
+{
+"@id": "amf://id#10/source-map/lexical/element_0"
+}
+],
+"http://a.ml/vocabularies/document-source-maps#type-property-lexical-info": [
+{
+"@id": "amf://id#10/source-map/type-property-lexical-info/element_0"
+}
+]
+},
+{
+"@id": "amf://id#9/source-map/synthesized-field/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "http://www.w3.org/ns/shacl#minCount",
+"http://a.ml/vocabularies/document-source-maps#value": "true"
+},
+{
+"@id": "amf://id#9/source-map/lexical/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "amf://id#9",
+"http://a.ml/vocabularies/document-source-maps#value": "[(19,12)-(22,0)]"
+},
+{
+"@id": "amf://id#8/source-map/lexical/element_1",
+"http://a.ml/vocabularies/document-source-maps#element": "amf://id#8",
+"http://a.ml/vocabularies/document-source-maps#value": "[(17,12)-(19,0)]"
+},
+{
+"@id": "amf://id#8/source-map/lexical/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "http://www.w3.org/ns/shacl#datatype",
+"http://a.ml/vocabularies/document-source-maps#value": "[(18,14)-(19,0)]"
+},
+{
+"@id": "amf://id#8/source-map/type-property-lexical-info/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "amf://id#8",
+"http://a.ml/vocabularies/document-source-maps#value": "[(18,14)-(18,18)]"
+},
+{
+"@id": "amf://id#10/source-map/lexical/element_1",
+"http://a.ml/vocabularies/document-source-maps#element": "amf://id#10",
+"http://a.ml/vocabularies/document-source-maps#value": "[(19,12)-(22,0)]"
+},
+{
+"@id": "amf://id#10/source-map/lexical/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "http://www.w3.org/ns/shacl#datatype",
+"http://a.ml/vocabularies/document-source-maps#value": "[(20,14)-(22,0)]"
+},
+{
+"@id": "amf://id#10/source-map/type-property-lexical-info/element_0",
+"http://a.ml/vocabularies/document-source-maps#element": "amf://id#10",
+"http://a.ml/vocabularies/document-source-maps#value": "[(20,14)-(20,18)]"
+},
+{
+"@id": "amf://id",
+"@type": [
+"http://a.ml/vocabularies/document#Document",
+"http://a.ml/vocabularies/document#Fragment",
+"http://a.ml/vocabularies/document#Module",
+"http://a.ml/vocabularies/document#Unit"
+],
+"http://a.ml/vocabularies/document#encodes": {
+"@id": "amf://id#2"
+},
+"http://a.ml/vocabularies/document#root": true,
+"http://a.ml/vocabularies/document#processingData": {
+"@id": "amf://id#1"
+}
+}
+]
+}
diff --git a/src/ApiMethodDocumentation.js b/src/ApiMethodDocumentation.js
index 990d547..7ae2430 100644
--- a/src/ApiMethodDocumentation.js
+++ b/src/ApiMethodDocumentation.js
@@ -359,7 +359,7 @@ export class ApiMethodDocumentation extends AmfHelperMixin(LitElement) {
   }
 
   get message() {
-    return this._getMessageForMethod(this.methodName);
+    return this._getMessageForMethod(this._computeOperationMethod(this.method));
   }
 
   constructor() {
@@ -1462,6 +1462,12 @@ export class ApiMethodDocumentation extends AmfHelperMixin(LitElement) {
         return this.returns;
       case 'publish':
         return this._computeAllExpects(this.method);
+      case 'send':
+      case 'receive': {
+        // AsyncAPI 3.0/3.1: operationMessages (→ endpoint channelMessages) — a Message[].
+        const endpoint = Array.isArray(this.endpoint) ? this.endpoint[0] : this.endpoint;
+        return this._computeOperationMessages(this.method, endpoint);
+      }
       default:
         return undefined;
     }
diff --git a/src/ApiUrl.js b/src/ApiUrl.js
index ddcc5cc..7d46a3b 100644
--- a/src/ApiUrl.js
+++ b/src/ApiUrl.js
@@ -235,7 +235,7 @@ export class ApiUrl extends AmfHelperMixin(LitElement) {
     // Check if it's gRPC and get appropriate display method and color
     const isGrpc = this._isGrpcOperation(this._operation);
     let displayMethod = method;
-    let methodForColor = method.toLowerCase();
+    let methodForColor = this._operationColorMethod(method.toLowerCase());
     
     if (isGrpc) {
       const streamType = this._getGrpcStreamType(this._operation);
@@ -340,8 +340,7 @@ export class ApiUrl extends AmfHelperMixin(LitElement) {
    * @return {String|undefined} HTTP method name
    */
   _computeMethod(operation) {
-    const methodKey = this.ns.aml.vocabularies.apiContract.method;
-    let name = /** @type string */ (this._getValue(operation, methodKey));
+    let name = /** @type string */ (this._computeOperationMethod(operation));
     if (name) {
       name = name.toUpperCase();
     }
diff --git a/test/async3-rendering.test.js b/test/async3-rendering.test.js
new file mode 100644
index 0000000..784eff3
--- /dev/null
+++ b/test/async3-rendering.test.js
@@ -0,0 +1,44 @@
+import { assert, fixture, html, aTimeout } from '@open-wc/testing';
+import { AmfLoader } from './amf-loader.js';
+import '../api-method-documentation.js';
+
+describe('AsyncAPI 3.0 operation rendering (method documentation)', () => {
+  let amf;
+  before(async () => {
+    amf = await AmfLoader.load('async30', false); // (fileName, compact)
+  });
+
+  function findSendEndpointAndOp() {
+    const endpoint = amf['@graph'].find((n) =>
+      n['@type']?.includes('http://a.ml/vocabularies/apiContract#EndPoint') &&
+      n['http://a.ml/vocabularies/apiContract#supportedOperation']);
+    const opRef = endpoint['http://a.ml/vocabularies/apiContract#supportedOperation'][0];
+    const op = amf['@graph'].find((n) => n['@id'] === opRef['@id']) || opRef;
+    return { endpoint, op };
+  }
+
+  async function load() {
+    const { endpoint, op } = findSendEndpointAndOp();
+    const element = await fixture(html`<api-method-documentation
+      .amf="${amf}" .endpoint="${endpoint}" .method="${op}"></api-method-documentation>`);
+    await aTimeout(100);
+    return element;
+  }
+
+  it('labels the async op SEND and colors it publish', async () => {
+    const element = await load();
+    // The badge is rendered by the nested api-url element, inside its own shadow root.
+    const apiUrl = element.shadowRoot.querySelector('api-url');
+    const badge = apiUrl && apiUrl.shadowRoot.querySelector('.method-label');
+    assert.exists(badge, 'no method badge found in nested api-url shadow root');
+    assert.equal(badge.textContent.trim().toLowerCase(), 'send');
+    assert.equal(badge.getAttribute('data-method'), 'publish');
+  });
+
+  it('discovers and renders the message payload', async () => {
+    const element = await load();
+    // message getter → send branch → operationMessages Message[] → payload
+    assert.isOk(element.message, 'no message discovered for send op');
+    assert.isOk(element.payload, 'no payload computed from the async message');
+  });
+});