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Currency Converter x402 MCP Server

@Br0ski777

Repository

Basic information

Category

Other

License

MIT

Transports

stdio

Author

Br0ski777

Submitted by

Br0ski777

About Currency Converter x402 MCP Server

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

Currency Converter x402 MCP Server 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"
    }
  }
}

Currency Converter x402 MCP Server tools

1

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

Frequently asked questions

1

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.

2

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.

3

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.

4

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.

5

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.

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