{
  "markdown": "# Keyword Research API\n\n[![MCP Server](https://img.shields.io/badge/MCP-server-blue)](https://keyword-research.api.klymax402.com/mcp)\n[![x402](https://img.shields.io/badge/payments-x402-6E56CF)](https://x402.org)\n[![License: MIT](https://img.shields.io/badge/license-MIT-green)](LICENSE)\n\nSEO keyword research -- Google Suggest, intent classification, long-tail discovery, related queries. Content planning. Pay-per-call via [x402](https://x402.org) (USDC on Base L2) -- no API key, no signup, no rate-limit wall.\n\nPart of the [klymax402](https://klymax402.com) marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.\n\n## Quickstart -- MCP\n\nAdd to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):\n\n```json\n{\n  \"mcpServers\": {\n    \"keyword-research\": {\n      \"url\": \"https://keyword-research.api.klymax402.com/mcp\"\n    }\n  }\n}\n```\n\n## Quickstart -- HTTP (x402)\n\n```bash\ncurl \"https://keyword-research.api.klymax402.com/api/keywords?query=...\"\n# -> 402 Payment Required, with an x402 payment challenge in the response body\n```\n\nAny x402-aware client ([`@x402/fetch`](https://www.npmjs.com/package/@x402/fetch), [`x402-agent-tools`](https://www.npmjs.com/package/x402-agent-tools), ATXP) handles the 402 -> sign -> retry cycle automatically.\n\n## Tools\n\n| Tool | Method | Path | Price | Description |\n|---|---|---|---|---|\n| `seo_research_keywords` | GET | `/api/keywords` | $0.02 | Research keywords with Google autocomplete suggestions, related queries, and intent classification |\n| `seo_research_keywords` | POST | `/api/keywords` | $0.02 | Research keywords with Google autocomplete suggestions, related queries, and intent classification (POST variant) |\n\n### `seo_research_keywords`\n\nUse this when you need keyword ideas, SEO research, or content planning data for a topic. Returns keyword suggestions and intent data in JSON.\n\n**Parameters**\n\n| Name | Type | Required | Description |\n|---|---|---|---|\n| `query` | string | yes | The seed keyword or phrase to research (e.g. 'bitcoin trading', 'best crm software') |\n\nExample response:\n\n```json\n{\"query\":\"bitcoin trading\",\"suggestions\":[\"bitcoin trading platform\",\"bitcoin trading bot\",\"bitcoin trading for beginners\"],\"relatedQueries\":{\"vs\":[\"bitcoin trading vs investing\"],\"howTo\":[\"how to start bitcoin trading\"]},\"longTailKeywords\":[\"best bitcoin trading app 2026\",\"bitcoin trading strategy for beginners\"],\"searchIntent\":\"commercial\",\"totalKeywords\":47}\n```\n\n**When to use**: writing blog posts, FOR SEO content strategy, topic cluster planning, content gap analysis, and competitive keyword research.\n\n**Not for**: page SEO audit (use `seo_audit_page`), content extraction (use `web_scrape_to_markdown`), domain intelligence (use `domain_lookup_intelligence`).\n\n### `seo_research_keywords`\n\nUse this when you need keyword ideas, SEO research, or content planning data for a topic. Returns keyword suggestions and intent data in JSON. POST variant of seo_research_keywords -- same params passed as JSON body instead of query string.\n\n**Parameters**\n\n| Name | Type | Required | Description |\n|---|---|---|---|\n| `query` | string | yes | The seed keyword or phrase to research (e.g. 'bitcoin trading', 'best crm software') |\n\nExample response:\n\n```json\n{\"query\":\"bitcoin trading\",\"suggestions\":[\"bitcoin trading platform\",\"bitcoin trading bot\",\"bitcoin trading for beginners\"],\"relatedQueries\":{\"vs\":[\"bitcoin trading vs investing\"],\"howTo\":[\"how to start bitcoin trading\"]},\"longTailKeywords\":[\"best bitcoin trading app 2026\",\"bitcoin trading strategy for beginners\"],\"searchIntent\":\"commercial\",\"totalKeywords\":47}\n```\n\n**When to use**: writing blog posts, FOR SEO content strategy, topic cluster planning, content gap analysis, and competitive keyword research.\n\n**Not for**: page SEO audit (use `seo_audit_page`), content extraction (use `web_scrape_to_markdown`), domain intelligence (use `domain_lookup_intelligence`).\n\n## Example agent prompts\n\n- \"Keyword ideas, SEO research, or content planning data for a topic\"\n- \"Keyword ideas, SEO research, or content planning data for a topic\"\n\n## Payment\n\n- Protocol: [x402](https://x402.org) -- HTTP-native pay-per-call, no signup, no API key\n- Network: Base L2 (`eip155:8453`)\n- Asset: USDC\n- Facilitator: Coinbase CDP (primary), PayAI (fallback)\n- Also reachable via [ATXP](https://atxp.ai) (OAuth-wrapped x402, RFC 9728 protected-resource metadata)\n\n## Part of klymax402\n\n100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.\n\n- Catalog: https://klymax402.com/llms.txt\n- Full API reference: https://klymax402.com/llms-full.txt\n- Live stats: https://klymax402.com/stats\n\n## License\n\nMIT\n",
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