Compare/finance.fx

Currency exchange rates

Reference exchange rates and conversions between currencies. 1 provider, 1 working now.

At a glance

1 of 1 provider for Currency exchange rates on Superpowers can serve a call right now: Frankfurter. Frankfurter is free with any Superpowers account. Call it with one API key: POST /v1/run with "tool": "frankfurter.exchange-rates", or through the MCP server. Every provider takes the same input and returns the same output, and failed calls are not charged.

Provider	Price	Success	Speed	Status
Exchange rates (Frankfurter)Frankfurter	Free	—	—	Live

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Pick up to 6 live providers. Each one is charged at its own price; failures are free.

Shared format

Input

{
  "type": "object",
  "additionalProperties": false,
  "required": [
    "base"
  ],
  "properties": {
    "base": {
      "type": "string",
      "pattern": "^[A-Z]{3}$",
      "description": "ISO 4217 code, e.g. USD"
    },
    "quotes": {
      "type": "array",
      "maxItems": 30,
      "items": {
        "type": "string",
        "pattern": "^[A-Z]{3}$"
      },
      "description": "Target currencies; omit for all"
    },
    "amount": {
      "type": "number",
      "exclusiveMinimum": 0,
      "maximum": 1000000000000,
      "default": 1
    }
  }
}

Normalized output

{
  "base": "",
  "rates": [
    {
      "quote": "",
      "rate": 0,
      "converted": 0,
      "date": ""
    }
  ]
}

Questions

Which Currency exchange rates API is cheapest?

Frankfurter is free with any Superpowers account.

Is there a free Currency exchange rates API?

Yes. Frankfurter is free with any Superpowers account; you only need a key.

How do I call a Currency exchange rates API from an AI agent?

Call it with one API key: POST /v1/run with "tool": "frankfurter.exchange-rates", or through the MCP server. Every provider takes the same input and returns the same output, and failed calls are not charged. New accounts get $5 free; see /docs for the MCP setup.