Use Case: WebSocket Real-Time FX Rates for a Trading Application
A sample Currencies API pricing simulation for streaming real-time FX rates over WebSocket.
Use Case: WebSocket Real-Time FX Rates for a Trading Application
This example estimates the cost of streaming real-time FX rates over WebSocket for a trading, monitoring, or analytics application.
Assumptions
| Item | Value |
|---|---|
| Protocol | WebSocket |
| Currency pairs | EUR/USD, GBP/USD, USD/JPY, USD/CAD, AUD/USD, USD/CHF |
| Number of pairs | 6 |
| Update interval | Every 500 ms |
| Updates per second per pair | 2 |
| Usage pattern | 24 hours/day |
| Estimated usage | 1,036,800 rates/day |
Example stream scope:
| Currency pair |
|---|
| EUR/USD |
| GBP/USD |
| USD/JPY |
| USD/CAD |
| AUD/USD |
| USD/CHF |
Rate usage
There are 86,400 seconds/day.
Each pair updates every 500 ms, or 2 times per second.
Daily usage:
86,400 seconds × 2 updates/second × 6 pairs = 1,036,800 rates/day
Pay As You Go estimate
Using the daily tiered rate pricing:
| Tier | Usage | Cost |
|---|---|---|
| First 100 rates/day | 100 | $0.50 |
| Next 100 rates/day | 100 | $0.40 |
| Next 100 rates/day | 100 | $0.30 |
| Next 100 rates/day | 100 | $0.20 |
| Next 600 rates/day | 600 | $0.60 |
| Next 9,000 rates/day | 9,000 | $4.50 |
| Next 90,000 rates/day | 90,000 | $22.50 |
| Remaining rates | 936,800 | $93.68 |
| Total/day | 1,036,800 | $122.68 |
Estimated 30-day usage:
$122.68 × 30 = $3,680.40/month
Plan comparison
| Plan | Price per Credit | Monthly cost | Included credits | Estimated monthly cost |
|---|---|---|---|---|
| Pay As You Go | $1.00/Credit | No commitment | N/A | $3,680.40 |
| Committed 64 | $0.85/Credit | $64 | ~75.29 credits | $3,669.11 |
| Committed 256 | $0.75/Credit | $256 | ~341.33 credits | $3,595.07 |
| Committed 512 | $0.70/Credit | $512 | ~731.43 credits | $3,460.97 |
| Committed 1024 | $0.65/Credit | $1,024 | ~1,575.38 credits | $3,129.02 |
Result
For this sample, Committed 1024 has the lowest estimated cost among the listed self-service plans.
Because this is a high-volume WebSocket workload, customers with similar usage may also want to discuss Enterprise pricing.
Caveat
Actual WebSocket usage depends on the number of subscribed currency pairs, update interval, number of connections, market activity, reconnect behavior, and whether multiple clients consume the same data separately.