# Open Exchange Rates

**Provider:** Open Exchange Rates
**Category:** finance
**Base URL:** `https://openexchangerates.org/api`
**Auth:** api-key — `?app_id=YOUR_APP_ID`
**Rate Limit:** 1,000 requests/month (free)
**Free Tier:** Yes — [object Object]
**Pricing:** Free tier available (freemium)
**Docs:** https://docs.openexchangerates.org

## Description

Open Exchange Rates provides a simple JSON API for current and historical foreign exchange rates, used by thousands of businesses and developers worldwide. Covers 200+ currencies including exotic and black-market rates. Ideal for e-commerce price localization, financial apps, accounting tools, and travel applications.

## Endpoints

| Method | Endpoint | Description |
|--------|----------|-------------|
| GET | `https://openexchangerates.org/api/latest.json` | Latest exchange rates (all currencies vs. USD) |
| GET | `https://openexchangerates.org/api/historical/{date}.json` | Historical rates for a specific date |
| GET | `https://openexchangerates.org/api/currencies.json` | List all supported currency codes and names |
| GET | `https://openexchangerates.org/api/convert/{value}/{from}/{to}` | Convert an amount between two currencies |
| GET | `https://openexchangerates.org/api/time-series.json` | Rates for a date range (paid plans) |

## Authentication

Pass your App ID as the app_id query parameter on every request.

```
?app_id=YOUR_APP_ID
```

## Sample Request

```bash
curl "https://openexchangerates.org/api/latest.json?app_id=$OER_APP_ID&symbols=EUR,GBP,JPY"
```

## Sample Response

```json
{
  "disclaimer": "Usage subject to terms: https://openexchangerates.org/terms",
  "base": "USD",
  "timestamp": 1704067200,
  "rates": {
    "EUR": 0.9218,
    "GBP": 0.7891,
    "JPY": 142.35
  }
}
```

## Pricing Details

Free: 1k requests/month, hourly rates, USD base only. Developer $12/mo: 3k requests, any base. Enterprise $97/mo: unlimited, real-time rates.

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*Source: [API Map](https://apimap.dev/apis/open-exchange-rates/) — CC BY 4.0*