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Grundpreis Pack Comparator
x402
Grundpreis Pack Comparator is a paid API for AI agents from grundpreis.halowerk.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-21).
Compares two or more product packs on a normalized price-per-unit basis, flagging incompatible or unknown quantities rather than silently miscomparing them.
Price / call$0.002
Success—
StatusUnknown
How this service works
Compare supplied packs within the same mass or volume basis. Example: 500 g at EUR 1.49 versus 1 kg at EUR 2.69. Unknown quantities and incompatible units are marked rather than silently compared.
Output
Returns a ranked list of the submitted packs with their normalized unit prices (e.g. price per kg or per litre), a best-value indicator, and explicit flags for any packs whose quantity was unrecognizable or whose units are incompatible with the others in the comparison set.
Example use cases
Grocery shopping unit price check
“I'm at the supermarket and I see yogurt in a 400g pot for EUR 0.99 and a 1kg tub for EUR 2.19 — which one is better value per 100g?”
Own-brand vs name-brand comparison
“Can you compare these three pasta packs: the 500g store brand at EUR 0.79, the 1kg name-brand at EUR 1.89, and a 750g organic option at EUR 1.65 — rank them by price per kilogram?”
Mixed units incompatibility detection
“Tell me if I can meaningfully compare a 330ml can of olive oil at EUR 2.50 against a 500g bottle at EUR 3.10 — and flag it if the units are incompatible.”
Technical details
Endpoint
POSThttps://grundpreis.halowerk.com/v1/pack-compare?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to compare multiple product packs on a normalized per-unit basis and want incompatible or ambiguous quantities explicitly flagged rather than silently ignored. It is purpose-built for grocery and retail price-per-unit comparison (Grundpreis in German law sense) and handles mixed quantity strings gracefully. Prefer it over generic math when unit parsing and incompatibility detection matter.
Side effects
- Quantity string cannot be parsed — pack is flagged as unknown rather than silently dropped
- Units are incompatible across packs (e.g. grams vs millilitres) — comparison is flagged rather than forced
- Fewer than 2 packs supplied — request rejected per minItems constraint
- Price is zero or negative — rejected by exclusiveMinimum validation
- EAN not found in Open Food Facts — quantity falls back to supplied quantity string or unknown flag
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| packs | array |
Tags
x402
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