Semust API

Semust API combines Google search and keyword data endpoints with a wider SEO platform. It is a strong fit for content creators and SEO teams that want research and ongoing optimization in one service, but buyers should match the plan’s credits, projects, and tracking limits to their workload.

Overview

The REST SERP API returns real-time Google results, including organic listings, ads, People Also Ask, AI Overview, images, and Knowledge Panel data. Its breadth makes it useful for workflows that need more than conventional blue-link results. The Keyword Research API returns search volume, keyword difficulty, CPC, search intent, and related suggestions through one endpoint, bringing several common research inputs together.

API requests authenticate with SEMUST-API-USER and SEMUST-API-PASSWORD HTTP headers. Semust also offers rank tracking, technical SEO checks, backlink analysis, AI content generation, internal linking, and reporting. That wider toolkit can reduce the need to split SEO work across services, although API-only buyers may not benefit from the extras.

Key features

Search data and SEO tools

Semust supports rankings, backlink, keyword, domain, and historical data, as well as organic traffic and ranking impact. Technical SEO scans can cover up to 20,000 URLs on paid plans, a substantial audit ceiling for larger sites. The platform also connects with Google Search Console, Google Ads, Google Analytics, Meta Ads, WordPress, Bing Webmaster, and Yandex Metrica, giving teams several ways to bring marketing and site data into their work.

Chrome extension

The free Semust SEO Toolbar can show a page outline, check HTTP status codes for links, and inspect JSON-LD data. These focused checks make it a useful companion for page-level review, but it is not a substitute for the platform’s larger audit and tracking features.

Pricing

Semust has a free plan and paid plans billed monthly, with a 14-day free trial that requires no credit card. The free trial is a time-limited way to evaluate the service, while its per-14-day credits and one-project allowance make it a constrained ongoing option.

PlanPriceIncluded limitsFreefree100 AI Credits/14 days; 15 Keyword Search/14 days; 15 Backlink Analysis/14 days; 15 SERP Analysis/14 days; 15 Competitor Analysis Credits/14 days; 10 Rank Tracking; 1 ProjectStarter$19 a month, billed monthly1750 AI Credits/month; 100 Keyword Search/month; 250 Rank Tracking; 5 ProjectBusiness$35 a month, billed monthly3250 AI Credits/month; 250 Keyword Search/month; 500 Rank Tracking; 10 Project; 1 Team SeatsEnterprise$59 a month, billed monthly5400 AI Credits/month; 500 Keyword Search/month; 1000 Rank Tracking; 40 Project; 3 Team SeatsScale$129 a month, billed monthly18k AI Credits/month; 1250 Keyword Search/month; 2000 Rank Tracking; 100 Project; 5 Team SeatsStarter is the lowest-cost paid option for an individual or small operation that needs more room than the single-project free plan; it has no team seats. Business is the first plan with a team seat and doubles Starter’s project allowance, while Enterprise and Scale raise project, tracking, and credit ceilings for larger workloads. Their additional seats—three on Enterprise and five on Scale—also matter for collaborative use. The paid plans share a 20,000-URL cap for technical SEO scans, so moving up does not raise that ceiling.

Platforms

Semust is available through API, web, and extension. The REST API suits developers integrating search data into another workflow; the web platform and Chrome extension serve users who want SEO work and quick page checks outside a custom integration.

Who it's for

Semust is aimed at people seeking to grow income through organic search and supports content creators. It is particularly well suited to creators and SEO teams that want keyword and SERP research alongside tracking, audits, and content tools. A buyer who needs only a narrow API endpoint may prefer a more focused service, while teams should weigh the plan-specific project and seat limits before adopting it as a shared workspace.

Pros and cons

Pros

Broad SERP coverage: results include ads, People Also Ask, AI Overview, images, and Knowledge Panel data as well as organic listings.

Compact keyword endpoint: volume, difficulty, CPC, intent, and related suggestions arrive through one API endpoint.

SEO work in one platform: tracking, audits, backlinks, content generation, internal linking, and reporting extend the service beyond data retrieval.

Accessible entry points: there is a no-card 14-day trial, a free plan, and paid monthly plans starting at $19 a month.

Cons

Free usage is tightly capped: the trial has limited credits, 10 rank-tracking units, and one project, which may not sustain a larger evaluation.

Plan fit requires quota checks: keyword searches, AI credits, tracking, and project limits change by tier, and the plan summaries do not give all of those categories equal prominence.

Scan ceiling is fixed across paid plans: technical SEO scans top out at 20,000 URLs, which may constrain very large site audits.

Team access begins above Starter: teams needing shared seats must move to Business or higher.

Alternatives

Semrush is worth considering for buyers who want a freemium SEO alternative with an API platform and a free tier that includes a demo project and 10 reports per day. SERPclimber may suit teams centered on Search Console properties and connected GSC, GA4, and Cloudflare data, with read-only MCP access on its free plan. ovoSEO is a lower-cost alternative for a single website: its free plan includes a basic audit, SEO checklist and roadmap, easy opportunities, and Google OAuth for GSC and GA4.

Rankerli is another freemium option for users prioritizing linked Search Console accounts and long-term GSC history. MetaMonster may fit buyers looking for a paid API and web service with page and bulk credits, crawling, and unlimited users on its Starter plan. Optux AI is an alternative for teams focused on A/B and split testing or AI text personalization. Statsig is a freemium option across web, mobile, and API platforms, with its Developer plan offering event analytics and session replays. RankGear is an alternative for readers looking at a desktop product for macOS or Windows.

SEO Testing Software is a useful category to compare if you are still deciding what kind of SEO tool fits your workflow.

Verdict

Choose Semust API if you want broad Google SERP and keyword data together with a practical set of SEO tools, and its project, seat, credit, and scan limits fit your workload. Its combination of a $19.00 USD monthly entry plan and a no-card trial makes it approachable to evaluate. Look elsewhere if you need only a specialized endpoint or if the 20,000-URL scan ceiling and tier quotas do not accommodate your scale.