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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 bodyAny 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