# Fixer.io AI integration on Definable

> Fixer.io is a simple and lightweight API for current and historical foreign exchange rates and currency conversion.

## What this connects

Fixer.io is a simple and lightweight API for current and historical foreign exchange rates and currency conversion.

Vendor: https://fixer.io/

## Tools available

**5** tools available. First 5:

- `FIXER_IO_CONVERT_CURRENCY` — Convert Currency — Tool to convert an amount from one currency to another. Use when you need current or historical exchange rates. Specify `date` for historical rates.
- `FIXER_IO_GET_FLUCTUATION` — Get Currency Fluctuations — Tool to fetch exchange rate fluctuations between two dates. Use when you need day-to-day currency rate changes.
- `FIXER_IO_GET_HISTORICAL_RATES` — Get Historical Rates — Fetch historical exchange rates for a specific date. Returns end-of-day (EOD) exchange rates for any date back to January 1, 1999. Use this when you need past currency conversion rates or historical financial data.
- `FIXER_IO_GET_SUPPORTED_SYMBOLS` — Get Supported Symbols — Tool to retrieve the list of all available currency symbols and their corresponding names. Use when you need to fetch and display supported currency codes.
- `FIXER_IO_GET_TIME_SERIES` — Get Time Series — Retrieves daily foreign exchange rates for a date range. Returns a time series of exchange rates for each day between start_date and end_date (inclusive, max 365 days). The rates show how much of each currency equals one unit of the base currency.

## Auth

Auth schemes: `API_KEY`.

## How agents use Fixer.io

Inside a Definable workflow, Fixer.io is one of the tools the **Distributor specialist** can call. Example coordination patterns:

- **Researcher → Fixer.io** — the Researcher (GPT-5.5) pulls context from Fixer.io (records, threads, documents), synthesises findings, and briefs the rest of the team.
- **Writer → Distributor → Fixer.io** — the Writer (Claude Opus 4.7) drafts copy in brand voice, the Verifier passes it, then the Distributor writes the result into Fixer.io (create record, post message, draft email).
- **Designer / Engineer → Distributor → Fixer.io** — the Designer ships an asset or the Engineer ships a code change, the Distributor delivers it via Fixer.io (attach file, open PR comment, post status).

The Verifier checks every Fixer.io call. On rate limit, schema drift, or auth refresh it self-heals and retries — the workflow completes without manual intervention.

## Categories

- developer tools — https://definable.ai/apps/category/developer-tools/

## Related

- HTML page: https://definable.ai/apps/fixer_io/
- Same category (developer tools): https://definable.ai/apps/category/developer-tools/
- All integrations: https://definable.ai/apps/
- Workflow (multi-agent loop): https://definable.ai/workflow/
- Apps llms.txt index: https://definable.ai/llms-apps.txt