SEO & Keyword Data APIs

What is an SEO & Keyword Data API?

An SEO & Keyword Data API lets developers keyword research data - search volume, difficulty, cpc, and ranking metrics for seo and ppc over HTTP. The SEO & Keyword Data APIs below are compared on pricing, compliance, capabilities, and developer experience from structured, cited data.

To be listed as a SEO & Keyword Data API, an API must have a public HTTP endpoint and published, sourced data. Listings are ranked on those verifiable fields, never on payment.

The APIs

• #1 DataForSEO

  ██████░░░░ 60 / 100

  DataForSEO is a usage-based REST API for SEO and digital-marketing data, covering SERPs, keyword research, backlinks, rank tracking, and on-page and content analysis across 94,000+ locations on Google, Bing, YouTube, and more. It is self-serve with transparent pay-per-request pricing from $0.0006 per request plus a $1 signup credit. Integration is REST with basic auth, webhooks, an official MCP server, and four SDKs. The platform is GDPR and ISO 27001 compliant, though no public SLA is offered. Launched 2016.

  PricingUsage · from $0.0006 request · free tier ✗

  TrustGDPR · ISO 27001

  Does

  • Historical data
  • AI Overview tracking
  • Local / geo data
  • Multiple search engines
  • Competitor analysis
  • Search intent
  • PPC / ad data
  • Clickstream data
  • Bulk / batch
  • Real-time

  Used byThe Links Guy

  Avoid ifYou want to try it free before paying

  DataForSEO profile →

• #2 Google Ads API

  ██████▒░░░ 65 / 100

  Google Keyword Planner, accessed through the Google Ads API, generates keyword ideas, historical metrics, and forecasts for campaign planning. It is a gRPC API using OAuth2, with eight official client libraries and an MCP server, and is self-serve for developers with a Google Ads account. The API is GDPR and ISO 27001 compliant. Best for teams already building on Google Ads that need programmatic keyword data.

  Pricing- · free tier ✓

  TrustGDPR · ISO 27001

  Does

  • Historical data
  • Local / geo data
  • PPC / ad data

  The catchFree, but historical search volumes come bucketed into broad ranges; fine for rough sizing, not precise tracking.

  Google Ads API profile →

• #3 Ahrefs API

  █████▒░░░░ 56 / 100

  Ahrefs API exposes the data behind Ahrefs' SEO toolset for custom integrations: keyword research, backlink analysis, rank tracking, site audits, and brand visibility across search and AI platforms. It is a REST API with API-key auth and an official MCP server. Pricing is published and self-serve, starting at $449/month as an Ahrefs subscription, with GDPR and ISO 27001 compliance and SOC 2 in progress. Launched 2010.

  PricingHybrid · from $449 month · free tier ✗

  TrustSOC 2 In progress · GDPR · ISO 27001

  Does

  • Historical data
  • AI Overview tracking
  • Multiple search engines
  • Competitor analysis
  • Search intent
  • Clickstream data
  • Bulk / batch

  Avoid ifYou want to try it free before paying

  Ahrefs API profile →

• #4 Serpstat API

  █████▓░░░░ 58 / 100

  Serpstat is a cost-focused SEO data API covering keyword research, backlink analysis, rank tracking, site audits, competitor analysis, and SERP crawling across 243 countries. The REST API uses API-key auth, an official MCP server, and five SDKs. Pricing is a published, self-serve subscription from $100/month. It is GDPR compliant. Used by Deloitte, Rakuten, Visa, and Uber.

  PricingSubscription · from $100 month · free tier ✗

  TrustGDPR

  Does

  • Historical data
  • Local / geo data
  • Multiple search engines
  • Competitor analysis
  • PPC / ad data
  • Bulk / batch

  Used byDeloitte, Rakuten, Visa, Uber

  Avoid ifYou want to try it free before paying

  Serpstat API profile →

• #5 Semrush API

  █████░░░░░ 53 / 100

  Semrush API extracts the platform's SEO and PPC data programmatically, covering organic and paid keywords, competitive analysis, ad history, and local SEO, with an MCP server for AI integration. It is a REST API supporting API-key and OAuth2 auth across 140+ countries. Pricing is published and self-serve, starting around $456/month. It is GDPR and PCI DSS compliant. Used by Samsung, LG, and Disney.

  PricingHybrid · from $455.67 month · free tier ✗

  TrustGDPR · PCI DSS

  Does

  • Historical data
  • AI Overview tracking
  • Local / geo data
  • Competitor analysis
  • Search intent
  • PPC / ad data
  • Clickstream data
  • Bulk / batch

  Used bySamsung, LG, ZoomInfo, Disney

  Avoid ifYou want to try it free before paying

  Semrush API profile →

• #6 Keywords Everywhere

  █████▒░░░░ 54 / 100

  Keywords Everywhere exposes search volume, CPC, competition, related keywords, and traffic and backlink data through a single REST API. It uses API-key auth and an official MCP server. Pricing is published and self-serve on a credit model from $84 per 100,000 credits per year, with 18 features such as related keywords and YouTube metrics usable without credits. It is GDPR compliant. Used by Adobe, the American Red Cross, Bayer, and the BBC.

  PricingHybrid · from $84 100,000 credits/year · free tier ✓

  TrustGDPR

  Does

  • Historical data
  • Bulk / batch

  Used byAdobe, American Red Cross, Bayer, BBC

  Avoid ifYou have strict compliance requirements

  Keywords Everywhere profile →

• #7 Moz API

  █████▒░░░░ 56 / 100

  Moz API powers custom SEO tools, dashboards, and integrations, with endpoints for keyword research and metrics, backlink and link analysis, competitive and SERP tracking, and brand monitoring. It is a REST API using API-key or basic auth. Pricing is published and self-serve, starting at $5/month with a free tier of 50 rows/month. Used by Content Harmony, iPullRank, and Intero Digital.

  PricingHybrid · from $5 month · free tier ✓

  Does

  • Historical data
  • Local / geo data
  • Competitor analysis
  • Search intent
  • Bulk / batch

  Used byContent Harmony, Odys Global, iPullRank, Intero Digital

  Avoid ifYou have strict compliance requirements

  Moz API profile →

• #8 SE Ranking

  ████▒░░░░░ 45 / 100

  SE Ranking's SEO API automates SEO and GEO workflows: competitor analysis and keyword gaps, AI search visibility, technical site audits, link building, and global market analysis across 188+ country databases. It is a REST API with API-key auth and an official MCP server. Pricing is published and self-serve on a credit model of about $50 per 250,000 credits, with a 14-day, 100,000-credit trial. It is GDPR compliant.

  PricingHybrid · from $50 250,000 API credits · free tier ✗

  TrustGDPR

  Does

  • Historical data
  • AI Overview tracking
  • Local / geo data
  • Competitor analysis
  • Search intent
  • PPC / ad data
  • Bulk / batch
  • Real-time

  Used byHigherVisibility, hurra.com, Votre Site Pro

  Avoid ifYou want to try it free before paying

  SE Ranking profile →

• #9 SpyFu API

  ████▓░░░░░ 47 / 100

  SpyFu API provides competitor keyword and ad-history research for SEO and PPC, built for bulk export, automated reporting, and embedding SpyFu data in your own product. It is a REST API using basic auth. Pricing is published and self-serve, starting at $89/month. Coverage centers on the United States.

  PricingHybrid · from $89 month · free tier ✗

  Does

  • Historical data
  • Competitor analysis
  • PPC / ad data

  Avoid ifYou want to try it free before paying

  SpyFu API profile →