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