Use Case: IEX Level 3 Order Book Data for 50 Symbols
A sample Stock API pricing simulation for downloading IEX Level 3 order book data over a trading month.
Use Case: IEX Level 3 Order Book Data for 50 Symbols
This example estimates the cost of downloading one trading month of IEX Level 3 order book data for 50 symbols.
Assumptions
| Item | Value |
|---|---|
| Product | Stock API |
| Workflow | Level 3 order book download |
| Endpoint pattern | GET /v1/native/iex/level3-order-book/{symbol} |
| Example symbols | AAPL, MSFT, NVDA, TSLA, AMZN |
| Symbols | 50 |
| Trading days | 20 |
| Sample daily response size per symbol | 0.385329062 GB |
| Estimated daily data transfer | 19.27 GB/day |
| Estimated monthly data transfer | 385.33 GB/month |
Example requests:
| Symbol | Example endpoint |
|---|---|
| AAPL | GET /v1/native/iex/level3-order-book/AAPL?date=2026-04-30 |
| MSFT | GET /v1/native/iex/level3-order-book/MSFT?date=2026-04-30 |
| NVDA | GET /v1/native/iex/level3-order-book/NVDA?date=2026-04-30 |
Estimated usage
Sample response size:
0.385329062 GB per symbol per day
For 50 symbols:
0.385329062 GB × 50 = 19.27 GB/day
For 20 trading days:
19.27 GB × 20 = 385.33 GB/month
Pay As You Go estimate
Since daily usage is below 32 GB/day, the first daily tier applies:
19.27 GB/day × $1.00/GB = $19.27/day
Estimated monthly cost:
$19.27 × 20 trading days = $385.33
Plan comparison
| Plan | Price per Credit | Monthly cost | Included credits | Estimated monthly cost |
|---|---|---|---|---|
| Pay As You Go | $1.00/Credit | No commitment | N/A | $385.33 |
| Committed 64 | $0.85/Credit | $64 | ~75.29 credits | $374.04 |
| Committed 256 | $0.75/Credit | $256 | ~341.33 credits | $300.00 |
| Committed 512 | $0.70/Credit | $512 | ~731.43 credits | $512.00 |
| Committed 1024 | $0.65/Credit | $1,024 | ~1,575.38 credits | $1,024.00 |
Result
For this sample, Committed 256 has the lowest estimated cost.
Committed 512 fully covers the estimated monthly usage, but Committed 256 is still lower in this scenario because the remaining usage after the included credits is billed as overage.
Caveat
Actual usage depends on the number of symbols, selected trading days, response size per symbol, market activity, retries, and whether the customer also downloads Level 2, trades, quotes, or OHLCV data.