Choose Narwhal API when
You need current rates, deterministic decimal conversion, stored daily observations, and economic-data APIs through the same key and quota.
Narwhal API vs Fixer
Fixer is a dedicated exchange-rate API for current and historical rates, conversion, and time-series workflows. Narwhal offers a smaller FX product connected to Economics, Palmoil, Calendars, REST, and hosted MCP under one account.
Decision
Choose Fixer when dedicated FX breadth, its documented currency count, or plan-based update frequency is the main requirement. Choose Narwhal when its published currencies fit and you value decimal-safe conversion, daily history, adjacent economic data, and hosted MCP in one contract.
Choose the alternative when
You need a dedicated FX service advertising 170 currencies, plan-dependent updates as often as 60 seconds, and its historical or time-series endpoints.
Evidence by requirement
Neither service's displayed rate should be treated as an executable bank quote without confirming the rate type. Compare sources, update cadence, historical granularity, base-currency rules, and plan entitlements.
| Requirement | Narwhal API | Fixer |
|---|---|---|
| Product scope | FX is one live family inside a multi-vertical financial-data API. | A dedicated foreign-exchange rates and conversion API. |
| Current rates | Current published rates include explicit timestamps and freshness semantics. | Fixer advertises 170 currencies and plan-dependent updates as frequently as every 60 seconds. |
| Conversion and history | Decimal-safe conversion and stored daily history use the same FX contract. | Current, historical, conversion, fluctuation, and time-series capabilities are documented across its plans. |
| Interfaces | JSON REST and hosted MCP share authentication and quota. | A JSON REST API; no first-party hosted MCP endpoint was established in this review. |
| Adjacent data | Economics, Palmoil, and public holidays are available through the same account. | The product is specialized around currencies rather than a shared multi-domain data model. |
Sources and review date
The comparison uses Narwhal's current public contract and the following first-party competitor pages.
Reviewed: