WEBVTT

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Before you scale a price checker,
define a valid observation.

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A successful request can still
give you the wrong price.

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Match the product, variant, seller, currency,
delivery destination and tax treatment.

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Fictional Run A:
EUR 24 item + EUR 4 delivery = EUR 28.

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

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

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This separate EUR-required observation returns USD.
Reject it: wrong currency.

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Keep rejected attempts and their reasons.
Their traffic still belongs in the sample.

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

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

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

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The base estimate is 21.6 decimal GB.
1 GB = 1,000,000,000 bytes.

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Add the chosen 20% allowance: 4.32 GB.
The fictional forecast is 25.92 GB.

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

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Compare your counter with settled, isolated account usage.
Unsettled usage is unknown, not zero.

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

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

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