3 Best APIs for JSON Format in Nigeria

CurrencyLayer is one of the most widely-used and long-established exchange rate APIs in the world, providing real-time and historical foreign exchange data for 168 currencies and precious metals. Now owned and operated by APILayer — a platform aggregating developer APIs across multiple categories — CurrencyLayer benefits from enterprise-grade infrastructure, high availability, and a large developer community built up over years of operation. Nigerian Naira (NGN) is fully supported as both a source and target currency. **What CurrencyLayer Does** CurrencyLayer delivers exchange rate data sourced from banks and commercial data providers, providing accurate mid-market rates for 168 world currencies alongside precious metals including gold (XAU), silver (XAG), platinum (XPT), and palladium (XPD). The API supports real-time rate queries, historical rate lookups for any past date, and currency conversion calculations. All responses are delivered in JSON format via simple HTTPS GET requests. **Nigeria Support** NGN (Nigerian Naira) is one of 168 supported currencies. On paid plans (Basic and above), NGN can be used as the base currency — allowing Nigerian apps to fetch NGN-denominated rates for all other currencies in a single call. On the free plan, the base currency is locked to USD (developers can still get NGN rates but must calculate conversions from the USD base). **Authentication** API access requires an API key, which is appended to all request URLs as the access_key query parameter (e.g., ?access_key=YOUR_KEY). API keys are issued immediately upon free signup at currencylayer.com. The service uses HTTPS for all requests to protect key confidentiality. **Pricing Plans** CurrencyLayer offers five tiers: - **Free**: 100 API calls/month, USD base currency only, hourly update frequency - **Basic**: $13.99/month — 10,000 calls/month, all 168 base currencies, conversion endpoint - **Professional**: $52.99/month — 100,000 calls/month, 10-minute rate updates - **Professional Plus**: $84.99/month — 500,000 calls/month, 60-second rate updates - **Enterprise**: Custom pricing for very high volume requirements The critical limitation of the free plan is the USD-only base currency restriction. Nigerian developers who need NGN as a base currency (e.g., to display NGN/USD rather than USD/NGN) must upgrade to at least the Basic plan ($13.99/month). **Update Frequency** Like ExchangeRate-API and other tiered providers, CurrencyLayer's rate freshness scales with plan: - Free and Basic: Updated every 60 minutes - Professional: Updated every 10 minutes - Professional Plus: Updated every 60 seconds For production Nigerian fintech applications requiring near real-time accuracy, the Professional Plus plan's 60-second updates are appropriate. **Historical Data** Historical exchange rate data is available on paid plans, enabling developers to query the exact NGN exchange rate on any specific past date. This is critical for Nigerian businesses that need to record foreign-currency transactions at the exchange rate prevailing on the transaction date — a requirement under IFRS accounting standards used by many Nigerian companies. **Precious Metals** CurrencyLayer is one of the few exchange rate APIs that includes gold and silver prices in its currency list. Gold (XAU) and silver (XAG) prices are returned in the same API response as fiat currencies, making CurrencyLayer useful for Nigerian commodity investment platforms and jewellery businesses that need to track both precious metal values and NGN FX rates. **APILayer Ecosystem** As part of the APILayer product suite, CurrencyLayer users can manage their API key, view usage analytics, and access support through the APILayer dashboard. APILayer also offers complementary APIs (VAT rates, IP geolocation, etc.) that can be purchased and managed in the same account — convenient for developers building multi-feature financial applications. **Important Limitation for Nigeria** CurrencyLayer provides official mid-market exchange rates from banks and data providers. It does not provide Nigerian parallel market (black market) or Bureau de Change rates. In periods of significant Naira volatility or divergence between official and parallel rates, CurrencyLayer rates may not reflect what Nigerian consumers or informal businesses actually transact at. For parallel market tracking, use Monierate. **Comparison with ExchangeRate-API** CurrencyLayer is older and more widely deployed but has a more restrictive free tier (100 calls vs. 1,500 calls on ExchangeRate-API). The Basic plan at $13.99/month is more expensive than ExchangeRate-API Pro at $10/month for comparable features. CurrencyLayer's advantage is the inclusion of precious metals and the APILayer ecosystem. Choose CurrencyLayer if precious metals rates or APILayer ecosystem integration matter; choose ExchangeRate-API for a more generous free tier and lower entry-level paid pricing. **Frequently Asked Questions** Q: Can I use NGN as a base currency on the free plan? A: No. The free plan is locked to USD as the base currency. Upgrade to Basic ($13.99/month) for NGN base currency support. Q: Does CurrencyLayer include gold prices? A: Yes. Gold (XAU), silver (XAG), platinum (XPT), and palladium (XPD) are included in the 168-currency response. Q: How do I authenticate API requests? A: Append your API key as access_key=[YOUR_KEY] in the request URL query string. Q: Is there a sandbox for testing? A: No dedicated sandbox — testing uses the live API with free tier credentials. Q: Who owns CurrencyLayer? A: CurrencyLayer is owned by APILayer, a platform aggregating developer-focused APIs.

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.