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FastForex API Documentation

Connect your application to real-time institutional exchange rates, cryptocurrency pairs, and spot metals data in minutes.

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1. Authentication

Pass your API key as a query parameter (?api_key=YOUR_KEY) or in the header (X-API-Key: YOUR_KEY). Use demo for testing.

2. Low Latency

Powered by Vercel KV Redis edge caching. All responses return the execution duration in ms (typically < 4ms).

3. Rate Limiting

Sliding window rate limiters safeguard uptime. Check your status and remaining quota anytime via the /usage endpoint.

Essential Endpoints

GET/fetch-all?from=USD
Fetch all 160+ currency rates for a base currency
GET/fetch-one?from=USD&to=EUR
Fetch single pair exchange rate
GET/convert?from=USD&to=EUR&amount=100
Convert specified amount from one currency to another
GET/crypto/fetch-prices?pairs=BTC/USD,ETH/USD
Real-time pricing for cryptocurrency pairs
GET/metals/spot?metal=XAU&curr=USD
Spot prices for Gold, Silver, Platinum, Palladium
View all 15+ endpoints in Swagger UI