diff --git a/README.md b/README.md
index 6c7b641..ec0eadd 100644
--- a/README.md
+++ b/README.md
@@ -488,6 +488,23 @@ queue() factory
 | `@neovici/cosmoz-queue/list/more/render` | `renderLoadMore()` -- "Load more" button |
 | `@neovici/cosmoz-queue/util/fetch` | `fetch()`, `setBaseInit()`, `handleJSON()`, `RequestError` |
 
+## Deprecation notices
+
+### `api` property → `details`
+
+The `api` property on `useQueue()` / `queue()` is **deprecated** and will be
+removed in v2.0.0. Use `details` instead:
+
+```ts
+// Before (deprecated)
+queue({ api: (id, item) => apiUrl(`items/${id}`) })
+
+// After
+queue({ details: (item) => fetch(apiUrl(`items/${item.id}`)).then(r => r.json()) })
+```
+
+See [Migration guide](docs/migration-api-to-details.md) for more patterns.
+
 ## License
 
 [Apache-2.0](LICENSE)
diff --git a/docs/migration-api-to-details.md b/docs/migration-api-to-details.md
new file mode 100644
index 0000000..e7bf03e
--- /dev/null
+++ b/docs/migration-api-to-details.md
@@ -0,0 +1,54 @@
+# Migration: `api` → `details`
+
+The `api` property on `useQueue()` / `queue()` is deprecated and will be removed in v2.0.0.
+
+## Quick reference
+
+| `api` (deprecated) | `details` (recommended) |
+| --- | --- |
+| `(id, item) => urlString` | `(item) => Promise<data>` |
+| Two params — `id` and `item` | One param — `item` |
+| Returns a URL string | Returns a Promise resolving to data |
+| Uses internal `json()` utility | Uses standard `fetch()` or any async source |
+
+## Migration patterns
+
+### Basic URL
+
+```ts
+// Before
+api: (id, item) => `/api/items/${id}`
+
+// After
+details: (item) => fetch(`/api/items/${item.id}`).then(r => r.json())
+```
+
+### With `apiUrl` helper
+
+```ts
+// Before
+api: (id, item) => apiUrl(`api/items/${id}`, { includeDetails: true })
+
+// After
+details: (item) =>
+  fetch(apiUrl(`api/items/${item.id}`, { includeDetails: true }))
+    .then(r => r.json())
+```
+
+### Async / await with error handling
+
+```ts
+details: async (item) => {
+  const response = await fetch(`/api/items/${item.id}`);
+  if (!response.ok) throw new Error(`HTTP ${response.status}`);
+  return response.json();
+};
+```
+
+## Timeline
+
+| Version | Status |
+| --- | --- |
+| **v1.7.0** | `api` deprecated — runtime `console.warn` emitted |
+| **v1.x** | `api` continues to work with warnings |
+| **v2.0.0** | `api` removed — migrate before this release |
diff --git a/src/queue/use-queue.ts b/src/queue/use-queue.ts
index 89c21ff..49c96c9 100644
--- a/src/queue/use-queue.ts
+++ b/src/queue/use-queue.ts
@@ -24,9 +24,35 @@ const useQNav = <I>({
 	items,
 	...thru
 }: {
+	/**
+	 * @deprecated Use the `details` property instead. The `api` property will be removed in v2.0.0.
+	 *
+	 * Migration example:
+	 * ```ts
+	 * // Before:
+	 * api: (id, item) => apiUrl(`api/items/${id}`)
+	 *
+	 * // After:
+	 * details: (item) => fetch(apiUrl(`api/items/${item.id}`)).then(res => res.json())
+	 * ```
+	 */
 	api?: (id: string, item: I) => string;
 	items: I[];
 } & UseDataNav<I>) => {
+	// Deprecation warning
+	/* eslint-disable no-console, no-template-curly-in-string */
+	if (api && typeof console !== 'undefined' && console.warn) {
+		console.warn(
+			'[cosmoz-queue] DEPRECATED: The `api` property is deprecated and will be removed in v2.0.0. ' +
+				'Please migrate to the `details` property for better control and performance.\n\n' +
+				'Migration guide:\n' +
+				'  Before: api: (id, item) => apiUrl(\'api/items/${id}\')\n' +
+				'  After:  details: (item) => fetch(apiUrl(\'api/items/${item.id}\')).then(res => res.json())\n\n' +
+				'See: https://github.com/Neovici/cosmoz-queue#migration-from-api-to-details',
+		);
+	}
+	/* eslint-enable no-console, no-template-curly-in-string */
+
 	const details = useMemo(
 			() => api && memoize((item: I) => json(api(id(item), item))),
 			[id, api],
@@ -45,6 +71,25 @@ interface Opts<I>
 	tabHashParam?: string;
 	idHashParam?: string;
 	onActivate?: (name: string) => void;
+	/**
+	 * @deprecated Use the `details` property instead. The `api` property will be removed in v2.0.0.
+	 *
+	 * The `api` property uses deprecated utilities and is less flexible than `details`.
+	 * With `details`, you have full control over the fetch operation and can return any Promise.
+	 *
+	 * Migration example:
+	 * ```ts
+	 * // Before:
+	 * useQueue({
+	 *   api: (id, item) => apiUrl(`api/items/${id}`)
+	 * })
+	 *
+	 * // After:
+	 * useQueue({
+	 *   details: (item) => fetch(apiUrl(`api/items/${item.id}`)).then(res => res.json())
+	 * })
+	 * ```
+	 */
 	api?: (id: string, item: I) => string;
 	id?: (i: I) => string;
 	split?: SplitOpts;