Discover / japan-business-day-api.matchan962.workers.dev

Japan Business Day API

■ Challenge detected

Japanese traditional calendar for a date: rokuyo (taian/butsumetsu... lucky days used for weddings, funerals, contracts), Japanese era (Reiwa) date, old lunisolar calendar date incl. leap months, 24 solar terms (sekki) and year eto. Verified against the National Astronomical Observatory of Japan.

x402
Base
Polygon
USDC

Listed price: $0.005
Challenge detected: 9 of the last 9 checks
Median response: 334 ms
Last checked: 16 Oct, 18:49 UTC
In our index since: 27 Sept 2026

Endpoint

curl -i https://japan-business-day-api.matchan962.workers.dev/v1/koyomi
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

10 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://japan-business-day-api.matchan962.workers.dev/v1

GET/is-business-day$0.005Is a given date a business day in Japan? Returns weekday/holiday status, official holiday name (JA/EN) and next/previous business day. Source: Cabinet Office of Japan.
GET/jpx/sq$0.01Nikkei 225 futures/options SQ (special quotation) day for a contract month: 2nd Friday, moved earlier if a non-trading day, plus the last trading day.
GET/payment-due-date$0.01Japanese payment terms calculator (shimebi/shiharaibi): e.g. 'month-end close, paid end of next month', shifted to the previous/next business day when the due date is a weekend or Japanese holiday. Supports bank calendar (Dec 31 - Jan 3).
GET/bank-value-date$0.01When will a bank transfer in Japan be credited? Given the submission time, returns the value date under standard processing: same day if before the bank cutoff (default 15:00 JST) on a bank business day, otherwise the next bank business day (skips weekends, national holidays, Dec 31 - Jan 3).
GET/holidays$0.01List all Japanese national holidays (JA/EN names) for a year, from official Cabinet Office data.
GET/jpx/record-date$0.01Japanese equities dividend/shareholder-benefit schedule: from a record date (kenri kakutei-bi) returns the last cum-rights trading day and the ex-rights date under T+2 settlement, handling weekends and holidays.
GET/koyomi$0.005Japanese traditional calendar for a date: rokuyo (taian/butsumetsu... lucky days used for weddings, funerals, contracts), Japanese era (Reiwa) date, old lunisolar calendar date incl. leap months, 24 solar terms (sekki) and year eto. Verified against the National Astronomical Observatory of Japan.
GET/jpx/trading-day$0.005Is the Tokyo Stock Exchange (JPX/TSE) open on a date? Returns closed reasons, next/previous trading day and the first/last trading days of the year (daihakkai/dainokai).
GET/koyomi/find$0.01Find auspicious dates in Japan: list days in a range (up to 366 days) matching rokuyo (e.g. taian) and optional weekdays (e.g. sat,sun) - for scheduling weddings, moving, contract signing and ceremonies.
GET/add-business-days$0.01Add or subtract N Japanese business days from a date (e.g. settlement date T+2, delivery ETA). Skips weekends and national holidays; optional bank calendar.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 10 of 10 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/japan-business-day-api.matchan962.workers.dev

Recent checks

4 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.16 Oct 2026

All 9 checks

When (UTC)	Result	HTTP	Response
16 Oct, 18:49 UTC	Challenge detected	402	128ms
15 Oct, 11:37 UTC	Challenge detected	402	334ms
14 Oct, 00:19 UTC	Challenge detected	402	388ms
12 Oct, 00:34 UTC	Challenge detected	402	855ms
10 Oct, 12:38 UTC	Challenge detected	402	38ms
9 Oct, 09:34 UTC	Challenge detected	402	71ms
8 Oct, 06:42 UTC	Challenge detected	402	242ms
7 Oct, 03:32 UTC	Challenge detected	402	894ms
4 Oct, 17:05 UTC	Challenge detected	402	942ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 18:49 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for Japan Business Day API?

Its listed price is $0.005.

What payment terms does Japan Business Day API advertise?

The listing advertises x402, Base, Polygon and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is Japan Business Day API listed?

In x402 Bazaar. Superstables first indexed it on 27 Sept 2026.

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