If you’ve noticed a keyword’s volume number change slightly depending on when you checked it, you’ve probably run into the reality that keyword volume and top-10 data don’t come from one single, authoritative source. They come from third-party providers, and the SERP Optimizer is built to draw on more than one: Keywords Everywhere, RapidAPI, and Apify. Understanding what each of these actually is — and why the numbers between them won’t always match — makes the data far less confusing to work with.
Why Multiple Providers Exist in the First Place
None of these three is a single monolithic “Google’s real numbers” feed — each is a different way of estimating or retrieving search behavior and search results, and each has its own strengths, pricing, and reliability characteristics. Relying on a single provider means you inherit all of that provider’s specific blind spots and outages. Supporting more than one, following the same configuration pattern across all of them, means the underlying research doesn’t grind to a halt if one particular source has an outage, a rate-limit issue, or a subscription lapse.
Keywords Everywhere
Keywords Everywhere is a dedicated keyword-data service — its whole purpose is supplying search volume, cost-per-click, and competition figures for keywords, and it does that as its core product rather than as a side effect of some other function. Because it’s purpose-built for this, it tends to be the most directly interpretable source for a straightforward “what’s the volume for this term” question. It’s also location- and currency-aware in its own right — the product’s configuration for it defaults to India as the country and Indian rupees as the currency, matching the same location logic that applies across the rest of the SERP Optimizer.
RapidAPI
RapidAPI isn’t a single data source — it’s a marketplace of APIs, and the product connects to a search-results API hosted there to retrieve actual top-10 ranking data for a keyword, with the location parameter set to return India-specific results by default. Because it’s fetching real search-engine results rather than a modeled estimate, it’s particularly useful for the “what does the competition actually look like” side of the SERP Optimizer, complementing the volume-focused strength of Keywords Everywhere.
Apify
Apify works on a similar principle to RapidAPI — retrieving real search-result data, in this case configured to a country parameter that also defaults to India — but through a different underlying mechanism. Having a second search-results provider alongside RapidAPI matters practically: search-result APIs, especially ones that scrape or interface with a live search engine, occasionally hit rate limits, temporary blocks, or subscription caps. Having Apify as a second option in the same role as RapidAPI means a hiccup with one doesn’t leave the top-10 comparison feature dead in the water.
Why the Numbers Don't Always Match
This is the part that trips people up if they don’t know it going in: it’s entirely normal for volume or ranking data to differ slightly depending on which provider generated it, because each is drawing from a different underlying dataset or methodology, refreshed on its own schedule. A phrase might show one volume figure from Keywords Everywhere and a somewhat different implied competitiveness picture from a RapidAPI-sourced top-10 pull. That’s not a bug or an inconsistency to be alarmed by — it’s the same reason two different well-known keyword tools on the market routinely disagree with each other on the exact same keyword. The absolute number matters less than using it consistently to compare your candidate keywords against each other.
Practical Guidance for Working With Multiple Sources
- Don’t chase perfect precision on a single volume number — use it as a relative signal against your other candidate keywords, not an exact forecast.
- If a number looks surprising, it’s worth a quick sanity check rather than an immediate assumption of provider error — location settings, discussed elsewhere in this series, are a common hidden cause of “wrong-looking” numbers.
- Remember that both search-result providers (RapidAPI and Apify) and the volume provider (Keywords Everywhere) all follow the same location-configuration pattern — checking and setting location once tends to apply consistently rather than needing separate configuration per provider.
- Rate limits are real for all three — plan keyword research sessions with some pacing rather than firing off dozens of checks in rapid succession (a companion article covers scheduling research to stay rate-limit-friendly).
The Underlying Principle
None of these three providers is “the correct one” and the others “backups” in a strict sense — they’re complementary sources covering the two different jobs the SERP Optimizer needs done: search volume (Keywords Everywhere) and real top-10 results (RapidAPI and Apify, redundantly). Understanding that the data is sourced this way, rather than generated from some single internal formula, is what makes small discrepancies between checks make sense instead of feeling like a bug every time you notice one.
