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Japan Customs Weekly Reference Exchange Rate (税関長公示レート)
x402
Japan Customs Weekly Reference Exchange Rate (税関長公示レート) is a paid API for AI agents from api.agentfeeds.jp, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Returns the official Japan Customs weekly reference exchange rate used to convert import declaration values to yen under Japanese customs law
Price / call$0.002
Success—
StatusUnknown
How this service works
Weekly official Japan Customs reference exchange rate (税関長公示レート) used to convert import declaration values to yen under Article 4-7 of the Customs Tariff Law -- a live proxy to the Customs weekly CSV, not a real-time market rate. Source: Japan Customs (customs.go.jp), whose terms of use explicitly permit commercial use. Factual published data only; not a live FX quote or trading advice.
Output
Returns the official Japan Customs weekly reference exchange rate (税関長公示レート) for one or all currencies, including the applicable week period, the currency code, and the yen conversion rate as published in the official Customs weekly CSV. Not a live market FX rate — this is the statutory rate used for import declaration valuation under Article 4-7 of the Customs Tariff Law.
Example use cases
Example prompt
“What is the official Japan Customs reference exchange rate for USD for the week containing March 15, 2025? I need the 税関長公示レート to calculate the yen value of an import declaration.”
Technical details
Endpoint
GEThttps://api.agentfeeds.jp/v1/jp/fx/customs_rateWhen to prefer
Use this endpoint when you need the official statutory Japan Customs reference exchange rate for import declaration valuation (税関長公示レート), not a real-time market FX quote. This is specifically required for Japanese customs compliance, import duty calculations, and trade documentation under Article 4-7 of the Customs Tariff Law. Prefer this over general FX APIs when the legal/regulatory customs rate is needed rather than a spot market rate.
Side effects
- No data available for the requested date (customs rate not yet published for that week)
- Invalid ISO currency code returns empty or error response
- Future dates may return no data if the rate has not yet been published
- Network or proxy error fetching the upstream customs.go.jp CSV source
- Rate published only weekly — querying mid-week returns the current week's already-published rate
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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