If your goal is tracking keyword rankings over time, the “best” SERP API usually depends on how many keywords you track, how often, and how much you care about geo/device/localized results. Here’s a practical shortlist:

Best overall for rank tracking

SerpApi

• Very reliable results and strong Google coverage
• Good for location, device, language, and advanced SERP features
• Easier to work with than many alternatives
• Usually one of the more expensive options

Best value for scale

DataForSEO

• Great for large-scale rank tracking
• Strong pricing for bulk usage
• Good APIs for SERP, keywords, and rank tracking workflows
• Slightly more technical to set up, but very solid

Best for simple integration

Zenserp

• Straightforward API
• Good for basic keyword rank monitoring
• Easier onboarding, but less feature-rich than SerpApi/DataForSEO in some cases

Best for enterprise / managed scraping

Oxylabs SERP API

• Strong reliability and infrastructure
• Good if you need high throughput and enterprise support
• Usually more expensive, but very robust

Best budget-friendly option

ScrapingBee or ScaleSERP

• Can be cost-effective
• Good for lighter tracking needs
• May require more careful tuning depending on search engine and volume

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My recommendation

• Small/medium SEO tools or agencies: SerpApi
• Large-scale rank tracking or cost-sensitive bulk monitoring: DataForSEO
• Enterprise / high reliability: Oxylabs
• Simple, lightweight use cases: Zenserp

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What to compare before choosing

For keyword ranking specifically, check:

• Geo targeting: country, city, ZIP, language
• Mobile vs desktop
• SERP features: featured snippets, local pack, AI overviews, etc.
• Historical tracking: does the API store results or only fetch live SERPs?
• Rate limits / quotas
• Pricing per request
• Data freshness
• Anti-bot reliability
• Ease of parsing results

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If you want, I can give you a ranked comparison table of the top 5 SERP APIs for SEO rank tracking with pricing, pros/cons, and best use case.