What is the x402 payment protocol?
x402 is an HTTP-native pay-per-call protocol that uses USDC on Base L2. It eliminates the need for API keys, signups, or subscription plans — the client pays per request automatically.
@Br0ski777
基本情報
Real-time stock quotes -- price, change %, volume, market cap, company name. All major US and intl exchanges. -- x402 micropayment API + MCP server for AI agents
以下の設定を使って、このサーバーを MCP 対応クライアントに追加してください。
{
"mcpServers": {
"stock-price": {
"url": "https://stock-price-production-3ec1.up.railway.app/mcp",
"transport": "sse"
}
}
}POST
Stock Price X402 is an MCP server that provides real-time stock quotes — price, change percentage, volume, market cap, and company name — for all major US and international exchanges. It uses the x402 micropayment protocol (USDC on Base L2) for pay-per-call access with no API key, no signup, and no rate-limit walls. It is part of the klymax402 marketplace.
Add the server URL https://stock-price.api.klymax402.com/mcp to your MCP client configuration (Claude Desktop, Cursor, ElizaOS, etc.). Then use the tool finance_get_stock_price with a symbol parameter (e.g., AAPL, TSLA). x402-aware HTTP clients can also call the /api/quote endpoint directly.
finance_get_stock_pricex402 is an HTTP-native pay-per-call protocol that uses USDC on Base L2. It eliminates the need for API keys, signups, or subscription plans — the client pays per request automatically.
No. The server uses x402 for payment, so there is no API key, signup, or rate-limit wall. Any x402-aware client handles the payment cycle automatically.
Payments are made in USDC on the Base L2 network (chain ID `eip155:8453`), facilitated by Coinbase CDP (primary) and PayAI (fallback).
Each call to `finance_get_stock_price` costs $0.002 USD (paid as USDC on Base).
The server supports all major US and international exchanges. You can query any standard stock ticker symbol (e.g., AAPL, TSLA, MSFT, GOOG). Crypto and currency tickers are not supported by this server.

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