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Stock Price API

Official registry Finance and payments

Real-time stock quotes — price, change, volume, market cap. x402 micropayment.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (sse)
Claude Code 
claude mcp add --transport sse stock-price-api 'https://stock-price.api.klymax402.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "stock-price-api": {
            "type": "sse",
            "url": "https://stock-price.api.klymax402.com/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Stock Price API
  2. Quickstart -- MCP
  3. Quickstart -- HTTP (x402)
  4. Tools
  5. Example agent prompts
  6. Payment
  7. Part of klymax402
  8. License

Stock Price API

Real-time stock quotes -- price, change %, volume, market cap, company name. All major US and intl exchanges. 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": {
    "stock-price": {
      "url": "https://stock-price.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://stock-price.api.klymax402.com/api/quote" \
  -H "Content-Type: application/json" \
  -d '{"symbol":"BTC"}'
# -> 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

ToolMethodPathPriceDescription
finance_get_stock_pricePOST/api/quote$0.005Get real-time stock quote with price, change, volume, and market cap
finance_get_stock_price

Use this when you need a real-time stock price quote. Returns market data for any ticker symbol in JSON.

Parameters

NameTypeRequiredDescription
symbolstringyesStock ticker symbol (e.g. AAPL, TSLA, MSFT, GOOG)

Example response:

{"symbol":"AAPL","companyName":"Apple Inc.","price":198.45,"change":2.30,"changePercent":1.17,"volume":54200000,"marketCap":3050000000000,"exchange":"NASDAQ","previousClose":196.15,"dayHigh":199.10,"dayLow":196.80}

When to use: portfolio monitoring, financial analysis, building stock dashboards, price alerts, and investment research.

Not for: crypto prices (use finance_get_token_price), currency conversion (use finance_convert_currency), weather data (use data_get_weather).

Example agent prompts

  • "A real-time stock price quote"

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)
  • Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

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

License

MIT

Frequently asked questions

What is Stock Price API?

Real-time stock quotes — price, change, volume, market cap. x402 micropayment.

How do I install Stock Price API?

It runs as a remote server. In Claude Code: claude mcp add --transport sse stock-price-api 'https://stock-price.api.klymax402.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Stock Price API need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Stock Price API open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Stock Price API?

It is published by Br0ski777. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.