Summary
Pulls exchange rates from the European Central Bank for fiat currencies and CoinGecko for crypto, letting you convert between them without hunting down APIs yourself. The x402 suffix indicates it supports micropayments through the HTTP 402 protocol, though the GitHub repo is sparse on implementation details. You'd reach for this when building finance dashboards, expense trackers, or any tool where Claude needs to quote prices across currencies in real time. Runs as a remote server over SSE, so no local setup required. Straightforward currency conversion as a service, assuming the hosted endpoint at klymax402.com stays reliable.
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Tools
Public tool metadata for what this MCP can expose to an agent.
1 tools
finance_convert_currencyUse 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. 1. convertedAmount: the resulting amount in t3 params
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. 1. convertedAmount: the resulting amount in t
Parameters* required
amountnumberAmount to convert
fromstringSource currency code (e.g., USD, EUR, BTC, ETH)
tostringTarget currency code (e.g., EUR, GBP, USD, BTC)
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
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
finance_convert_currency | POST | /api/convert | $0.003 | Convert 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
| Name | Type | Required | Description |
|---|---|---|---|
amount | number | yes | Amount to convert |
from | string | yes | Source currency code (e.g., USD, EUR, BTC, ETH) |
to | string | yes | Target currency code (e.g., EUR, GBP, USD, BTC) |
Returns
convertedAmount-- the resulting amount in target currencyexchangeRate-- the rate used for conversionfrom-- source currency codeto-- target currency codeamount-- original amount providedrateSource-- 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.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT
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Plug Mailtrap into your AI workflow and let it handle the email.
Connect Mailtrap MCP →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →Make coding agent sessions - Searchable, Shareable, Vendor-neutral & Scored.
Try For Free →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →