diff --git a/packages/ditto/storages/DittoAPIStore.test.ts b/packages/ditto/storages/DittoAPIStore.test.ts
new file mode 100644
index 00000000..1d51061f
--- /dev/null
+++ b/packages/ditto/storages/DittoAPIStore.test.ts
@@ -0,0 +1,71 @@
+import { DittoPolyPg } from '@ditto/db';
+import { DittoConf } from '@ditto/conf';
+import { genEvent, MockRelay } from '@nostrify/nostrify/test';
+import { assertEquals } from '@std/assert';
+import { generateSecretKey, getPublicKey } from 'nostr-tools';
+
+import { DittoAPIStore } from './DittoAPIStore.ts';
+
+import type { NostrMetadata } from '@nostrify/types';
+
+Deno.test('updateAuthorData sets nip05', async () => {
+  const alex = generateSecretKey();
+
+  await using test = setupTest((req) => {
+    switch (req.url) {
+      case 'https://gleasonator.dev/.well-known/nostr.json?name=alex':
+        return jsonResponse({ names: { alex: getPublicKey(alex) } });
+      default:
+        return new Response('Not found', { status: 404 });
+    }
+  });
+
+  const { db, store } = test;
+
+  const metadata: NostrMetadata = { nip05: 'alex@gleasonator.dev' };
+  const event = genEvent({ kind: 0, content: JSON.stringify(metadata) }, alex);
+
+  await store.updateAuthorData(event);
+
+  const row = await db.kysely
+    .selectFrom('author_stats')
+    .select(['nip05', 'nip05_domain', 'nip05_hostname'])
+    .where('pubkey', '=', getPublicKey(alex))
+    .executeTakeFirstOrThrow();
+
+  assertEquals(row.nip05, 'alex@gleasonator.dev');
+  assertEquals(row.nip05_domain, 'gleasonator.dev');
+  assertEquals(row.nip05_hostname, 'gleasonator.dev');
+});
+
+function setupTest(cb: (req: Request) => Response | Promise<Response>) {
+  const conf = new DittoConf(Deno.env);
+  const db = new DittoPolyPg(conf.databaseUrl);
+
+  const pool = new MockRelay();
+  const relay = new MockRelay();
+
+  const mockFetch: typeof fetch = async (input, init) => {
+    const req = new Request(input, init);
+    return await cb(req);
+  };
+
+  const store = new DittoAPIStore({ conf, db, relay, pool, fetch: mockFetch });
+
+  return {
+    db,
+    store,
+    [Symbol.asyncDispose]: async () => {
+      await store[Symbol.asyncDispose]();
+      await db[Symbol.asyncDispose]();
+    },
+  };
+}
+
+function jsonResponse(body: unknown): Response {
+  return new Response(JSON.stringify(body), {
+    headers: {
+      'Content-Type': 'application/json',
+    },
+  });
+}
diff --git a/packages/ditto/storages/DittoAPIStore.ts b/packages/ditto/storages/DittoAPIStore.ts
index ad7c6028..f423eae4 100644
--- a/packages/ditto/storages/DittoAPIStore.ts
+++ b/packages/ditto/storages/DittoAPIStore.ts
@@ -48,6 +48,7 @@ interface DittoAPIStoreOpts {
   conf: DittoConf;
   pool: NRelay;
   relay: NRelay;
+  fetch?: typeof fetch;
 }
 
 export class DittoAPIStore implements NRelay {
diff --git a/packages/ditto/utils/nip05.ts b/packages/ditto/utils/nip05.ts
index 60eb8c32..83ddc863 100644
--- a/packages/ditto/utils/nip05.ts
+++ b/packages/ditto/utils/nip05.ts
@@ -11,6 +11,7 @@ interface GetNip05Opts {
   conf: DittoConf;
   relay: NStore;
   signal?: AbortSignal;
+  fetch?: typeof fetch;
 }
 
 export async function lookupNip05(nip05: string, opts: GetNip05Opts): Promise<nip19.ProfilePointer> {
@@ -35,7 +36,7 @@ export async function lookupNip05(nip05: string, opts: GetNip05Opts): Promise<ni
         throw new Error(`Not found: ${nip05}`);
       }
     } else {
-      const pointer = await NIP05.lookup(nip05, { fetch: safeFetch, signal });
+      const pointer = await NIP05.lookup(nip05, { fetch: opts.fetch ?? safeFetch, signal });
       logi({ level: 'info', ns: 'ditto.nip05', nip05, state: 'found', source: 'fetch', pubkey: pointer.pubkey });
       return pointer;
     }