2 Best APIs for Base Currency Switching in Nigeria

Currencyapi.com is a modern, developer-first currency conversion API that provides real-time and historical exchange rate data for over 170 fiat currencies and major cryptocurrencies. Built for developers who need accurate, fast, and reliable FX data with a clean developer experience, Currencyapi.com stands out for combining both traditional fiat currencies (including Nigerian Naira, NGN) and cryptocurrency rates in a single unified API endpoint — a rare feature that reduces the number of integrations needed for multi-asset financial applications. **What Currencyapi.com Does** The API delivers exchange rate data in two primary modes: real-time rates (updated as frequently as every 30 seconds on the highest tier) and historical rates (available on paid plans). All responses are in JSON format. The API is RESTful and authentication uses an API key, which can be passed as a Bearer token in the Authorization header or as a query parameter. A Postman collection and SDKs in multiple programming languages are available to accelerate integration. **Nigeria Support (NGN)** Nigerian Naira (NGN) is fully supported as both a base and target currency. Nigerian developers can fetch the current rate of NGN against any of the 170+ supported currencies, convert NGN amounts to USD or EUR, or pull historical NGN rates for accounting and reporting purposes. **Cryptocurrencies + Fiat in One Call** Unlike most exchange rate APIs that handle only fiat currencies, Currencyapi.com includes major cryptocurrency rates (Bitcoin, Ethereum, and other prominent tokens) alongside fiat currencies in the same API response. This makes it particularly useful for Nigerian crypto/fintech hybrid applications that need to display both NGN fiat values and crypto asset values without calling separate APIs. **Pricing Plans** - **Free**: $0/month — 300 requests/month, daily updates, 1 API key, personal use only - **Small**: $9.99/month — 15,000 requests/month, hourly updates, 1 API key, commercial use - **Medium**: $39.99/month — 600,000 requests/month, 60-second updates, 2 API keys, sandbox access - **Large**: $79.99/month — 1.7 million requests/month, 30-second updates, 5 API keys, sandbox access The free tier (300 req/month) is suitable for prototyping and small personal projects. Commercial applications should use at minimum the Small plan ($9.99/month). Production applications needing near real-time rates require the Medium or Large plan. **Sandbox Environment** A dedicated sandbox environment is available on the Medium ($39.99/month) and Large ($79.99/month) plans. This allows developers to test API integrations, simulate responses, and validate error-handling scenarios without consuming live API quota. The sandbox is not available on the Free or Small plans. **Rate Limits & Quotas** Rate limits are enforced per calendar month. Quotas are tracked in API response headers. Once the monthly quota is exhausted, additional requests return an error response until the quota resets at the start of the next month. **Update Frequency** Exchange rate freshness is tied to plan tier: - Free: Updated once per day - Small: Updated every hour - Medium: Updated every 60 seconds - Large: Updated every 30 seconds For production Nigerian fintech applications that need accurate live rates (e.g., payment conversions, live rate displays), the Medium plan's 60-second update cycle is typically sufficient. **Historical Data** Historical exchange rate data is available on paid plans — allowing developers to query the NGN exchange rate on any specific past date. This is essential for accounting applications, audit trail generation, and period-specific financial reporting. **Developer Experience** Currencyapi.com provides a Postman collection for immediate API exploration, SDKs in multiple languages to accelerate integration, and clear documentation at currencyapi.com/docs. The API follows standard REST conventions, making it straightforward to integrate into any backend stack. **Important Limitation** Like most global exchange rate APIs, Currencyapi.com provides official mid-market exchange rates, not Nigerian parallel market (black market) or Bureau de Change rates. For Nigerian parallel market rates, use a Nigeria-specific source like Monierate. The official rates may diverge significantly from street rates during periods of high Naira volatility. **Frequently Asked Questions** Q: Can I use Currencyapi.com for free in production? A: The free plan allows 300 requests/month for personal use only. For commercial production use, the Small plan ($9.99/month) with 15,000 requests is the minimum. Q: Does Currencyapi.com support NGN? A: Yes. NGN is one of 170+ supported currencies. Q: Does it include cryptocurrency prices? A: Yes. Major cryptocurrencies (BTC, ETH, and others) are included alongside fiat currencies in the same API endpoint. Q: Is there a sandbox for testing? A: Yes, but only on Medium ($39.99/month) and Large ($79.99/month) plans. Free and Small plan users test against the live API. Q: Does it provide Nigerian black market rates? A: No. Only official mid-market rates. Use Monierate for Nigerian parallel market data.

ExchangeRate-API is one of the most developer-friendly and widely-used currency exchange rate APIs available globally. Founded to provide reliable, accurate, and affordable foreign exchange data, the platform delivers real-time and historical exchange rates for 165 currencies across 200 countries — including the Nigerian Naira (NGN) — through a clean, well-documented RESTful API. It is particularly popular among Nigerian developers building fintech apps, e-commerce platforms, and financial tools that require accurate NGN conversion rates against major world currencies. **What ExchangeRate-API Does** The API provides two primary services: real-time exchange rates and historical rate data. The standard endpoint returns the latest exchange rates for all 165 supported currencies relative to a chosen base currency. The pair conversion endpoint returns the conversion rate between any two specific currencies. The enriched data endpoint includes additional localization information such as currency symbols, decimal separators, and locale-specific formatting — useful for building polished financial UIs. **Nigeria Support** NGN (Nigerian Naira) is fully supported as both a base and target currency. Nigerian developers can fetch the current USD/NGN, EUR/NGN, GBP/NGN rates in a single API call, or query any cross rate between NGN and any of the other 164 supported currencies. This makes ExchangeRate-API suitable for any Nigerian application that displays, converts, or tracks exchange rates. **Historical Data** ExchangeRate-API provides access to historical exchange rate data going back to 1990 — available on all plans including the free tier. This is a rare feature among free exchange rate APIs and makes the platform valuable for building Naira devaluation charts, historical FX analysis tools, and financial reports requiring period-specific exchange rates. **Authentication** The API uses API key authentication. Keys are issued immediately upon free sign-up with just an email address — no credit card required. The key is appended to every request URL as a query parameter. For developers who want to test without even signing up, ExchangeRate-API also offers a no-key open access endpoint that returns exchange rates without authentication, though at a lower rate limit. **Pricing Plans** ExchangeRate-API offers three tiers: - **Free**: $0/month — 1,500 requests/month, daily rate updates, no credit card required - **Pro**: $10/month ($100/year) — 30,000 requests/month, hourly rate updates - **Business**: $30/month ($300/year) — 125,000 requests/month, rate updates every 5 minutes, priority support All plans include historical data, enriched data, high availability, and a long-term support (LTS) commitment — meaning the API will not break without advance notice of deprecation. **Rate Limits** Rate limits are enforced on a monthly basis. The quota consumed is tracked and the remaining allowance is provided in response headers. When the monthly quota is exhausted, the API returns HTTP 429 (Too Many Requests). After 20 minutes without requests, rate-limited open-access (no-key) IPs are automatically unblocked. **No Sandbox (Test with Free Tier)** ExchangeRate-API does not provide a dedicated sandbox environment. Testing is done using the free tier itself — since the free tier requires no credit card and provides 1,500 real API calls per month, this is typically sufficient for development and integration testing. **Use Cases for Nigerian Developers** ExchangeRate-API is appropriate for any Nigerian project that needs exchange rate data as a data source rather than as a core payment processing feature. It does not process transactions — it only provides rate data. Common Nigerian use cases include: displaying live NGN rates on remittance platforms, powering multi-currency invoice tools, building Naira rate trackers, and auto-converting product prices in NGN to USD/EUR for international storefronts. **Important Limitation for Nigeria** ExchangeRate-API provides mid-market exchange rates sourced from financial data providers. These rates are the "official" interbank rates, not the parallel market (black market) NGN rate that often differs significantly in Nigeria. For apps that need to track or display the Nigerian parallel market rate, Monierate is a more appropriate data source. ExchangeRate-API's NGN rates reflect the official CBN/interbank rate. **Challenges** The free tier's daily update frequency means the rate data can be up to 24 hours stale — not suitable for high-frequency trading or real-time FX conversion in production payment flows. For production fintech use where real-time accuracy matters, the Pro plan ($10/month) with hourly updates is the minimum recommended tier. **Frequently Asked Questions** Q: Do I need a credit card to start? A: No. The free plan requires only an email address. Q: Does ExchangeRate-API support NGN? A: Yes. NGN is one of 165 supported currencies. Q: How current are the rates on the free plan? A: Updated once per day. For hourly updates, upgrade to Pro ($10/month). Q: Does it provide black market / parallel market NGN rates? A: No. Only official mid-market rates. Use Monierate for Nigerian parallel market rates. Q: Can I use this for live payment processing in production? A: For rate display yes, but not for actual transaction processing — this is a data API, not a payment gateway.