Estimate Japan unit economics without hiding the assumptions. Japan Profitability API combines product cost, origin, planned selling price, channel fees, logistics, duty, tax and FX into an auditable unit-economics result. Every default remains labeled so it can be replaced with a real value.
Built in Japan · English-first JSON · Official and public source provenance · No government endorsement claimed
WHAT YOU CAN BUILD NO SIGN-UP · NO API KEY
Calculate a Japan profit estimate Enter four familiar product facts. The calculator is deterministic; it does not ask an LLM to invent money values.
One request, one Japan profit estimate
Will this product make money in Japan? Start with the product and its cost. Optional facts improve confidence.
Your decision appears here See the recommendation first, then selling price, total cost, profit, margin, break-even price, recommended minimum, and confidence.
PRODUCTION REQUEST
Copy a request, then inspect the actual response contract. The free key uses the same documented endpoint. Put the secret in a server-side environment variable and never commit it.
cURL TypeScript Python Copy
curl -X POST https://api.japanapistore.com/v1/profitability/calculate \
-H "Authorization: Bearer ${JAPAN_API_KEY}" -H "Content-Type: application/json" \
-d '{"product_name":"Wireless earbuds","cost":{"amount":15,"currency":"USD"},"origin_country":"CN","selling_price":{"amount":5980,"currency":"JPY"},"channel":"amazon_jp"}'Representative response Fields depend on evidence and input.
{"success":true,"status":"PROFITABLE","estimated_selling_price_jpy":5980,"estimated_total_cost_jpy":4810,"estimated_profit_jpy":1170,"profit_margin_percent":19.6,"break_even_price_jpy":4710,"confidence":43,"cost_breakdown":{"product_cost_jpy":2385,"platform_fee_jpy":502},"missing_fields":["international_shipping","hs_code","domestic_logistics"]}SOURCES, FRESHNESS, LIMITS
Evidence you can inspect—not a black-box “Japan answer.” Official rates and channel inputs carry their own dates. User-supplied actual costs replace labeled defaults.
Used for Tariff, customs valuation and official customs exchange-rate inputs when available.
Freshness Rates and source dates remain visible in the response; user-provided values override labeled defaults.
Transformation Costs are calculated deterministically and returned as an auditable breakdown.
Used for Consumption-tax context and published channel fees.
Freshness Each assumption is labeled; unavailable live facts are not invented.
Transformation JAPAN API STORE combines cost inputs into profit, margin and break-even values. Important limitations This is an estimate, not an accounting statement or guaranteed margin. Freight, returns, storage, advertising and duty can materially change the result. A profitable result does not mean the product is lawful to sell. FREE DEVELOPER TIER
Use the demo now. Create a key only when you are ready to build. No credit card for the free key. One dashboard gives access to the four existing APIs. 