Keyword Research API

MCP Server x402 License: MIT

SEO keyword research via Google Suggest with intent scoring and long-tail discovery. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "keyword-research": {
      "url": "https://keyword-research.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl "https://keyword-research.api.klymax402.com/api/keywords?query=..."
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
seo_research_keywords	GET	/api/keywords	$0.01	Research keywords with Google autocomplete suggestions, related queries, and intent classification

seo_research_keywords

Use this when you need keyword ideas, SEO research, or content planning data for a topic. Returns Google autocomplete suggestions, related queries (vs, for, how to, best, what is modifiers), long-tail keywords, and search intent classification (informational/transactional/navigational). Ideal for SEO strategy, blog topic research, and content gap analysis. Do NOT use for page SEO — use seo_audit_page. Do NOT use for content extraction — use web_scrape_to_markdown.

Parameters

Name	Type	Required	Description
query	string	yes	The seed keyword or phrase to research (e.g. 'bitcoin trading', 'best crm software')

Example agent prompts

• "Keyword ideas, SEO research, or content planning data for a topic"

Payment

• Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
• Network: Base L2 (eip155:8453)
• Asset: USDC
• Facilitator: Coinbase CDP (primary), PayAI (fallback)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

• Catalog: https://klymax402.com/llms.txt
• Full API reference: https://klymax402.com/llms-full.txt
• Live stats: https://klymax402.com/stats

License

MIT