# BIS Effective Exchange Rates (Currency Strength) API > How strong each currency is on a trade-weighted basis, served live from the Bank for International Settlements' open statistics API — no key, nothing cached. An effective exchange rate (EER) measures a currency against a basket of its trading partners' currencies, not just one pair — it is the single best gauge of whether a currency is broadly strengthening or weakening. The BIS publishes nominal and real (inflation-adjusted) EER indices for 64 economies, against a broad (64-economy) or narrow (27-economy) basket, all on a base of 100. The rankings endpoint returns every economy's current EER index, ranked, so you can see the world's strongest and weakest currencies at a glance. The country endpoint returns one economy's EER index with its history and its 12-month change. The movers endpoint ranks the biggest currency gainers and losers over the past year — who has appreciated and who has depreciated most. Everything is the BIS's own compiled data, live, nothing stored; figures are monthly. This is the trade-weighted currency-strength layer for any forex, macro, trade or research app. Distinct from bilateral FX-rate and central-bank APIs — this is effective exchange rates: real and nominal trade-weighted currency strength, from the BIS. 3 endpoints, no key on our side. ## Authentication All requests require your oanor API key in the `x-oanor-key` header. Get one at https://www.oanor.com/developer/keys. ```bash curl -H "x-oanor-key: oanor_live_…" "https://api.oanor.com/eer-api/..." ``` ## Pricing - **Free** (Free) — 2,500 calls/Mo, 2 req/s - **Starter** ($10/Mo) — 38,000 calls/Mo, 6 req/s - **Pro** ($24/Mo) — 215,000 calls/Mo, 15 req/s - **Mega** ($57/Mo) — 1,100,000 calls/Mo, 40 req/s ## Endpoints ### EER #### `GET /v1/country` — One economy EER + history + 12m change **Parameters:** - `country` (query, required, string) — Country code (US, GB, JP, XM for euro area) Example: `US` - `type` (query, optional, string) — real (default) or nominal Example: `real` - `basket` (query, optional, string) — broad (default) or narrow Example: `broad` - `history` (query, optional, string) — Number of past months (default 24) Example: `12` **Example:** ```bash curl -H "x-oanor-key: $KEY" \ "https://api.oanor.com/eer-api/v1/country?country=US&type=real&basket=broad&history=12" ``` **Response:** ```json { "data": { "base": "index, 2020 = 100", "type": "real", "as_of": "2026-04", "basket": "broad (64 economies)", "source": "Bank for International Settlements", "country": "United States", "history": [ { "date": "2025-05", "eer_index": 109.26 }, { "date": "2025-06", "eer_index": 108.05 }, { "date": "2025-07", "eer_index": 107.28 }, { "date": "2025-08", "eer_index": 107.95 }, { "date": "2025-09", "eer_index": 107.49 }, { "date": "2025-10", "eer_index": 107.69 }, { "date": "2025-11", "eer_index": 108.01 }, { "date": "2025-12", "eer_index": 106.71 }, { "date": "2026-01", "eer_index": 106.35 }, { "date": "2026-02", "eer_index": 104.94 }, { "date": "2026-03", "eer_index": 107.38 }, { "date": "2026-04", "eer_index": 107.06 } ], "eer_index": 107.06, …(truncated, see openapi.json for full schema) ``` #### `GET /v1/movers` — Biggest currency gainers and losers (12m) **Parameters:** - `type` (query, optional, string) — real (default) or nominal Example: `nominal` - `basket` (query, optional, string) — broad (default) or narrow Example: `broad` - `limit` (query, optional, string) — Top/bottom N (default 10) Example: `5` **Example:** ```bash curl -H "x-oanor-key: $KEY" \ "https://api.oanor.com/eer-api/v1/movers?type=nominal&basket=broad&limit=5" ``` **Response:** ```json { "data": { "type": "nominal", "basket": "broad (64 economies)", "source": "Bank for International Settlements", "window": "12 months", "biggest_losers": [ { "as_of": "2026-04", "country": "Argentina", "eer_index": 5.13, "country_code": "AR", "change_12m_pct": -23.43 }, { "as_of": "2026-04", "country": "Türkiye", "eer_index": 15.67, "country_code": "TR", "change_12m_pct": -17.92 }, { "as_of": "2026-04", "country": "Japan", "eer_index": 68.46, "country_code": "JP", "change_12m_pct": -13.15 }, { "as_of": "2026-04", "country": "India", "eer_index": 82.41, "country_code": "IN", "change_12m_pct": -11.41 }, { "as_of": "2026-04", "country": "Philippines", "eer_index": 89.26, "country_code": "PH", "change_12m_pct": -7.5 } ], "strongest_gainers": [ { "as_of": "2026-04", "country": "Israel", "eer_index": 130.11, "country_code": "IL", …(truncated, see openapi.json for full schema) ``` #### `GET /v1/rankings` — Every economy EER, ranked **Parameters:** - `type` (query, optional, string) — real (default) or nominal Example: `real` - `basket` (query, optional, string) — broad (default) or narrow Example: `broad` **Example:** ```bash curl -H "x-oanor-key: $KEY" \ "https://api.oanor.com/eer-api/v1/rankings?type=real&basket=broad" ``` **Response:** ```json { "data": { "base": "index, 2020 = 100", "note": "higher index = stronger currency vs trading partners", "type": "real", "count": 64, "basket": "broad (64 economies)", "source": "Bank for International Settlements", "rankings": [ { "as_of": "2026-04", "country": "Argentina", "eer_index": 143.96, "country_code": "AR" }, { "as_of": "2026-04", "country": "Mexico", "eer_index": 140.49, "country_code": "MX" }, { "as_of": "2026-04", "country": "Poland", "eer_index": 129.49, "country_code": "PL" }, { "as_of": "2026-04", "country": "Czechia", "eer_index": 126.7, "country_code": "CZ" }, { "as_of": "2026-04", "country": "Colombia", "eer_index": 126.37, "country_code": "CO" }, { "as_of": "2026-04", "country": "Russia", "eer_index": 126.16, "country_code": "RU" }, { "as_of": "2026-04", "country": "Iceland", "eer_index": 125.66, "country …(truncated, see openapi.json for full schema) ``` ### Meta #### `GET /v1/meta` — Spec **Example:** ```bash curl -H "x-oanor-key: $KEY" \ "https://api.oanor.com/eer-api/v1/meta" ``` **Response:** ```json { "data": { "source": "Bank for International Settlements stats API — WS_EER (live)", "service": "eer-api", "economies": 64, "endpoints": { "GET /v1/meta": "This document.", "GET /v1/movers": "Biggest currency gainers and losers over 12 months (type=, basket=, limit).", "GET /v1/country": "One economy's EER + history + 12-month change (country=US, type=, basket=).", "GET /v1/rankings": "Every economy's current EER, ranked (type=real|nominal, basket=broad|narrow)." }, "description": "How strong each currency is on a trade-weighted basis, from the Bank for International Settlements (WS_EER): nominal and real (inflation-adjusted) effective exchange-rate indices for 64 economies, against a broad or narrow basket, base 100. The rankings endpoint ranks every economy's current EER (strongest to weakest currency); the country endpoint returns one economy's EER with history and 12-month change; and the movers endpoint ranks the biggest currency gainers and losers over the past year. Live, no key, nothing stored; figures monthly. Distinct from bilateral FX-rate and central-bank APIs — this is effective exchange rates: real and nominal trade-weighted currency strength.", "upstream_status": "ok" }, "meta": { "timestamp": "2026-06-09T20:24:49.537Z", "request_id": "d3e3e04e-1580-47b4-907e-f6e13b6273f1" }, "status": "ok", "message": "Meta", …(truncated, see openapi.json for full schema) ``` --- Marketplace page: https://www.oanor.com/api/eer-api OpenAPI spec: https://www.oanor.com/api/eer-api/openapi.json