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

Tool	Method	Path	Price	Description
finance_get_stock_price	POST	/api/quote	$0.005	Get 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

Name	Type	Required	Description
symbol	string	yes	Stock 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.

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

License

MIT