# Real Effective Exchange Rate (REER) API

> Real Effective Exchange Rate (REER) API is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-19).

Returns inflation-adjusted real effective exchange rates for currencies against 64 economies, including country rankings by annual change or a single country's historical series, sourced from BIS data.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/real-effective-fx?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/real-effective-exchange-rate-reer-api-b671a505
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HrIYai9ejwOx48FbwNHpL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability real-effective-exchange-rate-reer-api-b671a505 -d '<json body>'
```

Example prompt: Show me the BIS real effective exchange rate ranking of all 64 economies with their annual change — I want to see which currencies have appreciated the most in inflation-adjusted terms recently.

## When to prefer this

Choose this endpoint when you need inflation-adjusted, trade-weighted currency competitiveness data sourced directly from the Bank for International Settlements — specifically when nominal exchange rates are insufficient and you need to account for relative price levels. It is ideal for macroeconomic research, trade competitiveness analysis, and cross-country currency strength rankings rather than spot FX rates or nominal exchange rate lookups.

## Known failure modes

- Invalid or unsupported ISO 2-letter country code returns an error or empty result
- Requesting a country not in BIS broad basket (fewer than 64 economies) may return no data
- Missing required body fields causes a validation error
- Data may have a publication lag of one or more months relative to current date
- Network or upstream BIS data unavailability may cause timeouts

## How this service works

Real effective exchange rate index (2010 = 100) from the World Bank: rises mean the currency gets dearer and the country loses competitiveness. Ranking with the latest annual change, or one country's yearly series.

## Output

Returns a JSON object with the BIS data source label, the number of countries covered (up to 64), and either a ranked array of all countries (each with country code, name, latest REER index value, reference month, and annual percentage change) or a time-series array for a single country over the requested number of months.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "months": {
   "type": "integer",
   "description": "History length in months (annual data points)"
  },
  "country": {
   "type": "string",
   "description": "ISO 2-letter code (US, GB, JP, CN...); omit for ranking"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Index 2010 = 100, annual data.",
  "source": "Source: World Bank, World Development Indicators, CC BY 4.0 (https://datacatalog.worldbank.org/public-licenses#cc-by). Selected and reformatted by Vextorium.",
  "ranking": [
   {
    "name": "Venezuela, RB",
    "year": "2016",
    "index": 741.53,
    "country": "VEN",
    "annual_change_pct": 139.39
   },
   {
    "name": "Ghana",
    "year": "2025",
    "index": 86.18,
    "country": "GHA",
    "annual_change_pct": 27.08
   }
  ],
  "countries": 94
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/real-effective-exchange-rate-reer-api-b671a505/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)