Context7

Context7 on xpay — Real-time library documentation lookup for coding agents

Context7 is a documentation and code-example lookup service built by Upstash that helps developers and AI agents find accurate, up-to-date information about programming libraries and frameworks. Instead of relying on stale training data or incomplete local docs, agents can query live documentation in real time—perfect for answering version-specific questions, finding API signatures, or pulling working code examples during development.

Developers typically reach for Context7 when they need their AI assistant to have access to current library APIs, when they're working with rapidly-evolving frameworks, or when they want to reduce hallucination by grounding agent responses in authoritative source material.

What's available

• resolve-library-id — Convert a human-readable package or product name (e.g., "React", "lodash", "FastAPI") into a Context7-compatible library ID. This step is required before querying docs, ensuring the agent targets the exact library you want.
• query-docs — Retrieve and search live documentation and code examples for any programming library or framework. Pass the library ID from resolve-library-id and a query string to get relevant snippets, API signatures, and working examples.

When Context7 is the right tool

• You need your agent to access current library documentation without waiting for model retraining.
• You're building coding assistants that must provide accurate, version-aware API information.
• You want to reduce hallucination by grounding agent responses in authoritative docs.
• You're working with rapidly-evolving frameworks where docs change frequently (e.g., Next.js, Svelte, FastAPI).
• You need working code examples pulled directly from official sources.
• You're building developer tools that integrate library lookup as a core feature.

When to choose something else

• If you only need general programming knowledge (algorithms, design patterns, language fundamentals), a large language model's training data may suffice.
• If you're querying proprietary or internal documentation, Context7 won't help—you'd need a custom integration or a general RAG solution.
• If you need multi-language documentation search across hundreds of libraries simultaneously, a dedicated search engine or aggregator might be more cost-effective at scale.
• If your use case is one-off lookups rather than agent-driven queries, a browser search or IDE inline docs may be faster.

Pricing snapshot

Both tools are priced at $0.01 per invocation. Typical workflows (resolve ID + query docs) cost $0.02 per lookup.

Quickstart

First, sign up at xpay.tools with email or Google, then copy your xpay API key.

Option 1: Context7 alone (recommended for single-provider use)

claude mcp add --transport http context7 "https://context7.mcp.xpay.sh/mcp?key=YOUR_XPAY_KEY"

Option 2: All xpay providers in one connection

claude mcp add --transport http xpay "https://mcp.xpay.sh/mcp?key=YOUR_XPAY_KEY"

For Cursor, Windsurf, Cline, or VS Code (Copilot): Add a server entry to your mcp.json file:

{
  "mcpServers": {
    "context7": {
      "url": "https://context7.mcp.xpay.sh/mcp?key=YOUR_XPAY_KEY"
    }
  }
}

Once connected, your agent can call resolve-library-id with a package name, then pass the returned library ID to query-docs with a search query. For example: "Use resolve-library-id to find the React library, then query-docs to find the useState hook signature."

Why route Context7 through xpay?

• No Context7 signup required — xpay holds the upstream credentials; you authenticate once with your xpay API key.
• Pay only for what you use — $0.01 per call, no subscriptions or monthly minimums. $5 free credit to start.
• MCP-native integration — Works seamlessly with Claude Code, Cursor, Windsurf, Cline, and VS Code—no custom client needed.
• Unified billing across providers — If you use multiple xpay providers (Tavily, Apollo, etc.), one invoice covers all of them.
• Instant provisioning — Start querying docs immediately after signup; no waiting for approval or account setup with Context7 directly.