Error Submitting Page to IndexNow and How to Fix Each IndexNow Error Code

How do I fix IndexNow error 403?

A 403 means the engine tried to confirm you own the site and could not. It fetches a text file named after your key, normally at the root of the domain, and expects to find the key inside it and nothing else. The IndexNow documentation lists the two failure cases plainly: key not found, or file found but key absent.

Rank Math is supposed to publish that file for you, and on some sites it never appears. One Rank Math support ticket turned on exactly that, with the key file created by hand in the end. Open the key location in a private browser window. If you see a 404, a login page, a Cloudflare challenge or a security plugin block, that is your 403. Create the file by hand at the root with the key as its only content, or allow the path through your firewall, then submit again.

• The key must be 8 to 128 characters of letters, numbers and dashes.
• The file must be UTF-8 text and return HTTP 200 to anonymous visitors.
• A key file inside a folder only covers URLs inside that folder.

Why does IndexNow return 422 Unprocessable Entity?

Because at least one URL in the request does not belong to the host you declared, or the key does not match the format the protocol requires. On WordPress the usual culprit is a mismatch between the WordPress Address setting and the address visitors actually use. A site that answers on www.example.com but submits example.com URLs, or a staging copy that still submits its own domain, gets a 422.

The protocol treats the request as a whole, so one stray URL can sink a batch of hundreds. Indexing filters every batch against the site's own host before it sends it, which is why this code rarely reaches our customers.

What does IndexNow 429 Too Many Requests mean?

It means the engine thinks you are submitting too often, and the documentation labels it potential spam detection. Auto-submit settings that fire on every save are the common trigger: fix a typo five times and the same URL goes out five times. On shared hosting, other sites on the same IP address can add to the count.

IndexNow.org asks publishers to submit "only when content has changed" and to "wait at least 5 minutes between updates before resubmitting." Turn off auto-submit for post types that do not need it, such as attachments, and let the submissions that matter go out once.

Why is the IndexNow response code 0?

A 0 or blank code is not something IndexNow sends. It usually means the request never received an HTTP answer at all. The call was blocked on the way out, timed out, or hit a short outage. In one public Rank Math support thread a user saw exactly this, a response code of 0, and it cleared by itself a little later.

If it keeps happening, the cause is almost always on the server. Some hosts restrict outgoing connections from PHP, and some security plugins block them. Your host can confirm in a minute whether outbound HTTPS to api.indexnow.org is allowed.

Does a successful IndexNow submission mean my page is indexed?

No. A 200 means the URL was received. IndexNow.org is direct about it: "Submitting a URL does not guarantee immediate indexing," and engines still weigh crawl quota, scheduling and quality before they crawl. A submission is shared with every participating engine, including Bing, Yandex, Seznam, Naver and Yep, so one request is enough.

Google is not one of them. Google does not use IndexNow, so a clean History tab in Rank Math says nothing about Google at all. For Google you still need an accurate sitemap and, for the pages that matter, a way to see whether they were indexed. That second part is where most WordPress setups have nothing.

How Indexing handles IndexNow for the sites you own

We generate a key for each site and give you the file to upload. Before the first submission we fetch it ourselves, and if it is missing, blocked or holds anything other than the key, you get the exact reason instead of a 403 later. Batches are filtered to the site's own host, capped well under the 10,000 URL limit, and counted against your plan's monthly allowance, so nothing is quietly dropped.

Every accepted URL is stamped with the time it went out. Then the part a plugin cannot do begins. We check index status for each URL, give every missing page a plain-English reason such as noindex, canonical or redirect, and resubmit only the ones that can actually be indexed. Google gets sitemaps and, where Google documents it, the Indexing API.

Who this is for, and which plan fits

Site owners and in-house SEOs publishing on WordPress who have lost trust in the plugin's red and green lines, agencies who need to know that client posts were submitted and indexed rather than assume it, and publishers pushing enough URLs a day that a silent failure costs real traffic.

Starter is $29 a month billed annually ($59 month to month) for about 2,000 URLs on one site with daily monitoring. Growth is $47 a month billed annually for about 25,000 URLs, hourly monitoring and automatic resubmission. Agency is $119 a month billed annually for about 150,000 URLs across many sites, API access and white label reports.