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Currency Converter API

Official registry Finance and payments

Fiat and crypto currency conversion — ECB + CoinGecko rates. x402 micropayment.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (sse)
Claude Code 
claude mcp add --transport sse currency-converter-api 'https://currency-converter.api.klymax402.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "currency-converter-api": {
            "type": "sse",
            "url": "https://currency-converter.api.klymax402.com/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Currency Converter API
  2. Quickstart -- MCP
  3. Quickstart -- HTTP (x402)
  4. Tools
  5. Example agent prompts
  6. Payment
  7. Part of klymax402
  8. License

Currency Converter API

Fiat and crypto currency converter -- ECB rates for fiat, CoinGecko for crypto. Instant cross-rate lookup. 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": {
    "currency-converter": {
      "url": "https://currency-converter.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://currency-converter.api.klymax402.com/api/convert" \
  -H "Content-Type: application/json" \
  -d '{"amount":"1","from":"...","to":"..."}'
# -> 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

ToolMethodPathPriceDescription
finance_convert_currencyPOST/api/convert$0.003Convert between fiat currencies and cryptocurrencies
finance_convert_currency

Use this when you need to convert between any currencies -- both fiat (USD, EUR, GBP, JPY) and crypto (BTC, ETH, SOL). Returns conversion result in JSON.

Parameters

NameTypeRequiredDescription
amountnumberyesAmount to convert
fromstringyesSource currency code (e.g., USD, EUR, BTC, ETH)
tostringyesTarget currency code (e.g., EUR, GBP, USD, BTC)

Returns

  • convertedAmount -- the resulting amount in target currency
  • exchangeRate -- the rate used for conversion
  • from -- source currency code
  • to -- target currency code
  • amount -- original amount provided
  • rateSource -- data source used (ECB for fiat, CoinGecko for crypto)
  • timestamp -- when the rate was fetched

Example response:

{"convertedAmount":2815.40,"exchangeRate":0.9218,"from":"USD","to":"EUR","amount":3054.00,"rateSource":"ECB","timestamp":"2026-04-13T12:00:00Z"}

When to use: price conversions across fiat and crypto in a single call. Essential for international pricing, invoice generation, and portfolio valuation in local currency.

Not for: market data or charts (use finance_get_token_price), DeFi swap quotes (use dex_get_swap_quote), wallet balances (use wallet_get_portfolio).

Example agent prompts

  • "Convert between any currencies -- both fiat (USD, EUR, GBP, JPY) and crypto (BTC, ETH, SOL)"

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)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

License

MIT

Frequently asked questions

What is Currency Converter API?

Fiat and crypto currency conversion — ECB + CoinGecko rates. x402 micropayment.

How do I install Currency Converter API?

It runs as a remote server. In Claude Code: claude mcp add --transport sse currency-converter-api 'https://currency-converter.api.klymax402.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Currency Converter API need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Currency Converter API open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Currency Converter API?

It is published by Br0ski777. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.