Currency Converter API
Fiat and crypto currency conversion — ECB + CoinGecko rates. x402 micropayment.
Open source Repository Open in the app JSON README (API)
About
Fiat and crypto currency conversion — ECB + CoinGecko rates. x402 micropayment.
Details
- Kind
- MCP servers
- Topic
- Finance & crypto
- Publisher
- br0ski777
- Origin
- official
- Category
- ferramentas
- Transport
- sse
- Version
- 1.1.0
- Last push
- 2026-09-02T19:55:35Z
- Repository state
- ativo
- Language
- TypeScript
- License
- MIT
- Added
- 2026-08-29 03:01:43
- Updated
- 2026-08-29 03:01:43
- Origin id
io.github.Br0ski777/currency-converter
README
# Currency Converter API
[](https://currency-converter.api.klymax402.com/mcp)
[](https://x402.org)
[](LICENSE)
Fiat and crypto currency converter -- ECB rates for fiat, CoinGecko for crypto. Instant cross-rate lookup. Pay-per-call via [x402](https://x402.org) (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the [klymax402](https://klymax402.com) 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.):
```json
{
"mcpServers": {
"currency-converter": {
"url": "https://currency-converter.api.klymax402.com/mcp"
}
}
}
```
## Quickstart -- HTTP (x402)
```bash
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`](https://www.npmjs.com/package/@x402/fetch), [`x402-agent-tools`](https://www.npmjs.com/package/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 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:
```json
{"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](https://x402.org) -- 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