Currency Converter x402

@Br0ski777

About Currency Converter x402

Fiat and crypto currency converter -- ECB rates for fiat, CoinGecko for crypto. Instant cross-rate lookup. -- x402 micropayment API + MCP server for AI agents

#x402 #mcp #api #currency #forex #crypto

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "currency-converter": {
      "url": "https://currency-converter-production-b190.up.railway.app/mcp",
      "transport": "sse"
    }
  }
}

Tools

POST

Overview

What is Currency Converter x402?

Currency Converter x402 is an MCP server that converts between fiat currencies (USD, EUR, GBP, JPY) and cryptocurrencies (BTC, ETH, SOL) using ECB exchange rates for fiat and CoinGecko for crypto. It charges a micropayment per call via the x402 protocol (USDC on Base L2) with no API key or signup required. It is part of the klymax402 marketplace of 100+ x402 micropayment APIs for AI agents.

How to use Currency Converter x402?

Add the server URL https://currency-converter.api.klymax402.com/mcp to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.). Alternatively, call the HTTP endpoint /api/convert with amount, from, and to parameters; an x402-aware client handles the payment challenge automatically. The only tool is finance_convert_currency.

Key features of Currency Converter x402

Fiat-to-fiat, crypto-to-crypto, and cross-rate conversion in one call
Uses ECB rates for fiat and CoinGecko rates for crypto
Pay-per-call via x402 micropayments (USDC on Base L2)
No API key, no signup, no rate-limit walls
Returns exchange rate, source, and timestamp with each conversion
Part of the klymax402 marketplace with a single wallet for 100 APIs

Use cases of Currency Converter x402

Convert prices for international invoicing or e-commerce
Calculate portfolio valuations in a user’s local currency
Build AI agents that need live currency conversion for quotes or reports
Handle mixed fiat/crypto amounts from user prompts

FAQ from Currency Converter x402

What currencies are supported?

Fiat currencies include USD, EUR, GBP, JPY; cryptocurrencies include BTC, ETH, SOL. Additional codes may be supported via ECB and CoinGecko.

How do I pay for each call?

Each call costs $0.001 USDC on Base L2, settled automatically via the x402 protocol. No signup, API key, or manual payment setup is needed.

Where do exchange rates come from?

Fiat rates come from the European Central Bank (ECB); crypto rates come from CoinGecko. The rateSource field in the response indicates which source was used.

What is not supported?

This server does not provide market data or charts, DeFi swap quotes, or wallet balances. For those, separate klymax402 tools are available.

Do I need to install any client software?

Any x402-aware HTTP client (e.g., @x402/fetch, x402-agent-tools, ATXP) will handle the payment challenge automatically. For MCP, add the URL to your client config as shown in the quickstart.

Frequently asked questions