Before you scale a price checker — Portproof
90-second captioned educational demonstration, prepared 14 October 2026.
All prices, observations and workload inputs are fictional. The calculator sample is separate from the offer examples.
This is a silent video assembled from actual local browser screenshots. It is not a continuous screen recording, retailer test or proxy benchmark.
Prepared with AI assistance.

00–05 seconds
Before you scale a price checker, define a valid observation.

05–10 seconds
A successful request can still give you the wrong price.

10–15 seconds
Match the product, variant, seller, currency, delivery destination and tax treatment.

15–20 seconds
Fictional Run A: EUR 24 item + EUR 4 delivery = EUR 28.

20–25 seconds
Fictional Run B: EUR 25 item + EUR 0 delivery = EUR 25.

25–30 seconds
The item rose by EUR 1; the total fell by EUR 3. Missing delivery is unknown, not free.

30–36 seconds
This separate EUR-required observation returns USD. Reject it: wrong currency.

36–42 seconds
Keep rejected attempts and their reasons. Their traffic still belongs in the sample.

42–47 seconds
The planner uses a separate invented sample: 10,800,000 bytes and 120 accepted observations.

47–52 seconds
That is 90,000 bytes per accepted observation. The offer examples did not produce this sample.

52–57 seconds
1,000 products x 2 markets x 4 daily checks x 30 days = 240,000 planned observations.

57–61 seconds
The base estimate is 21.6 decimal GB. 1 GB = 1,000,000,000 bytes.

61–66 seconds
Add the chosen 20% allowance: 4.32 GB. The fictional forecast is 25.92 GB.

66–71 seconds
Use your own permitted, representative sample. Keep failed attempts and retries in the sample once.

71–76 seconds
Compare your counter with settled, isolated account usage. Unsettled usage is unknown, not zero.

76–80 seconds
Go, hold or stop using your acceptance conditions. Headroom is an allowance, not a guarantee.

80–85 seconds
Try the planner; no account is needed. portproof.org/tools/price-monitoring-calculator

85–90 seconds
Portproof supplies shared mobile and residential proxy traffic. Your software decides whether the result is useful.

Open the traffic planner: https://portproof.org/tools/price-monitoring-calculator
Use workflows you own or are authorised to access; respect destination terms and request limits.