We record each call made to WebAPI and charge at the end of the month. There is no minimum or maximum limits. More you use, more discount you get.

We have free tier of volume you can use each month.

Pricing table:

calls made, up toprice / 1000 calls
up to 5,000   free 
up to 100,000   € 1.00
up to 1,000,000   € 0.50
up to 10,000,000   € 0.25
all following
€ 0.10

Examples for different usages counting in requests per minute/second or even hundreds of requests per second. 

average usagecalls per monthfinal pricediscountusage examples
1 call per minute 43,200    € 38.2011.57%moderate usage, most users will not hit these number
10 calls per minute 432,000    € 261.0039.58%normal usage, most users will not hit these number
1 call per second 2,592,000    € 943.0063.62%big brokers might need data very often
10 calls per second 25,920,000    € 4,387.0083.07%even bigger brokers which need data very often
100 call per second 259,200,000    € 27,715.0089.31%very heavy load, hypothetically. Shown for clearance

For example, you want to make ~30000 calls per month. It will costs: (30 - 5(free)) * 1eur = 25 eur

Another example for 1m calls:

Total: 545 eur

Discount: 45.5%