SEO APIs bill per row, and an assistant asked to "research this niche" can burn through an allowance in one turn. Documenting the cost next to each tool, and shipping a free call that reports the remaining balance, is what makes it safe to let a model drive. The alpha label and the encoding requirement are both worth taking at face value.
A Java MCP server over the Serpstat API. It covers the standard SEO research loop: understand a domain, find the keywords it ranks for, find who competes with it, and expand a seed keyword into related terms — with a tool that reports remaining API credits, because most of the others consume them.
- `get_domains_info` — visibility, keyword count, estimated traffic, dynamics and PPC data for several domains at once
- `domain_regions_count` — keyword count by country across every Google regional database — the recommended first step on any complex domain analysis
- `domain_keywords` — the keywords a domain ranks for, with position, traffic and difficulty
- `get_domain_competitors` — the top 20 competitors from search results with traffic, visibility and relevance scores
- `get_backlinks_summary` — referring domains, backlink counts, link types, quality metrics and recent changes for a domain or subdomain
- `get_keywords` — related keyword research with volume, cost per click, difficulty and SERP features; costs 1 API credit per keyword returned
- `keyword_competitors` — the top-20 domains competing for one keyword, with a graded competition assessment and filtering by domain list, traffic range, visibility and relevance; each competitor costs 1 credit, with a minimum of 1 credit per request even when the result is empty
- `get_related_keywords` — semantically related terms with connection strength, intent distribution and SERP feature presence, filterable by volume, difficulty and pattern; priced the same way
- `api_stats` — remaining credits and usage percentage, and `projects_list` for your Serpstat projects, which does not consume credits
A Serpstat API token from a Team or higher subscription with API access, supplied as `SERPSTAT_API_TOKEN`. Java 17 or newer and Maven 3.6 or newer; build with `mvn clean package` and point the client at the jar with `java -jar`. Set `LANG` and `LC_ALL` to a UTF-8 locale — on Windows the documented config also passes `-Dfile.encoding=UTF-8` — or non-ASCII results come back mangled. This is labelled an alpha release, v0.0.2. Logs are written to `logs/serpstat-mcp-server.log` and rotated.