SerpApi vs SearchAPI.io
Choosing between SerpApi and SearchAPI.io? Both are search providers you can call through a single Auxiliar key, so the honest answer is usually “use whichever wins the job in front of you” — and with one key and one bill, you don’t have to commit to either.
We ran both on the identical curator-fleet corpus. SearchAPI.io leads on structured Google/SERP results (9.02 vs 9.0). On the headline test (structured Google/SERP results), SerpApi scored 9.0/10 (quality 1.00) versus 9.02/10 for SearchAPI.io. The full measured breakdown is below.
Measured, side by side
Composite score /10 on each shared capability, from the Auxiliar curator fleet — same corpus for both.
| Capability | SerpApi | SearchAPI.io | Winner |
|---|---|---|---|
| SERP verticalsQuality | 91.00 · #3/4 | 9.020.98 · #2/4 | SearchAPI.io |
| SearchRecall@10 | 6.10.59 · #9/11 | 6.440.57 · #8/11 | SearchAPI.io |
SerpApi — choose if
You're compliance-sensitive, need multi-engine breadth, or want the drop-in LangChain default.
SearchAPI.io — choose if
You want SerpApi-compatible JSON at a lower price, with pay-per-success billing.
SerpApi — avoid if
You're price-sensitive versus Serper for Google-only queries.
SearchAPI.io — avoid if
You depend on large Google result pages (num silently capped at 10 since Sept-2025).
One key. Every provider on this page.
Stop juggling signups and invoices. One Auxiliar API key calls all of them — upstream keys injected server-side, usage billed to a single balance. Swap the base URL and go.
curl https://api.auxiliar.ai/serper/search \ -H "Authorization: Bearer $AUXILIAR_API_KEY" \ -H "Content-Type: application/json" \ -d '{"q": "latest ai agent news"}'