{"id":"d798492c-2b35-4c61-aa38-03fae5441d9a","shortId":"DuJfPz","kind":"x402","title":"Japanese FX gotobi (五十日) date lookup — next occurrence, with holiday adjustments through 2099.","tagline":"Japanese FX gotobi (五十日) date lookup — next occurrence, with holiday adjustments through 2099.","description":"The Gotobi Calendar API is a specialized x402-payable endpoint that returns the next Japanese gotobi (五十日) date relative to today. Gotobi dates are the 5th, 10th, 15th, 20th, 25th, and last day of each month — key settlement dates in Japanese foreign exchange markets when USD/JPY demand typically spikes. The `/gotobi/next` endpoint returns today's date, the next gotobi date, and the number of days until it, with automatic adjustment for Japanese public holidays (shifted to the preceding business day). Coverage extends through 2099.\n\nThe API is part of a broader Gotobi Calendar service hosted at gotobi.hugen.tokyo that also offers endpoints for checking whether today is a gotobi date (`/gotobi/today`), listing all gotobi dates in a given month (`/gotobi/dates?month=YYYY-MM`), and querying Japanese public holidays (`/gotobi/holidays`, `/gotobi/holidays/today`, `/gotobi/holidays/next`). All paid endpoints cost $0.01 USDC per call on Base via the x402 protocol. Alternative access is available through an MCP gateway, API key with free trial credit, or the `x402-pay` Python SDK.\n\nThe response schema for `/gotobi/next` includes `today` (current date string), `next_gotobi_date` (the upcoming gotobi date string), `days_until` (integer countdown), and a human-readable `description` field. The OpenAPI 3.1 spec is fully published with typed schemas for all endpoints.","tags":[],"capabilities":["gotobi-date-lookup","japanese-holiday-calendar","fx-settlement-dates","holiday-adjusted-dates","x402-payment","usdc-base-settlement","openapi-3.1-spec"],"categories":["finance","calendar"],"synonyms":["gotobi","五十日","japanese settlement dates","USD/JPY gotobi","FX gotobi calendar","japan holiday calendar","gotobi trading dates","japanese business calendar"],"warnings":["Root URL returns 404 — no landing page; documentation is only at /docs (Swagger UI)","No dedicated pricing page; price is only visible in the x402 challenge header","The description field in responses is inferred from the sample in the x402 challenge; exact wording may vary"],"endpointUrl":"https://gotobi.hugen.tokyo/gotobi/next","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x29322Ea7EcB34aA6164cb2ddeB9CE650902E4f60","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"},"payTo":"4du4AfkjJEwch2zk3shkPJVZfyJHNDnNjEWC6AboaS5Z","amount":"5000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300}]},"qualityScore":"0.820","qualityRationale":"Full OpenAPI 3.1 schema with typed response models is published. The x402 challenge is live and returns a sample response confirming the endpoint works. Price is clearly stated ($0.01 USDC on Base). Docs are auto-generated Swagger; no dedicated prose documentation or usage examples beyond the SDK one-liner, which slightly limits 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'/gotobi/holidays':156 '/gotobi/holidays/next':158 '/gotobi/holidays/today':157 '/gotobi/next':78,198 '/gotobi/today':137 '0.01':163 '10th':54 '15th':55 '2099':13,26,111 '20th':56 '25th':57 '3.1':225 '5th':53 'FX gotobi calendar' 'USD/JPY gotobi' 'access':174 'adjust':11,24,97 'also':126 'altern':173 'api':30,113,181 'automat':96 'avail':176 'base':168 'broader':118 'busi':106 'calendar':29,120 'call':166 'check':130 'cost':162 'countdown':215 'coverag':108 'credit':186 'current':201 'date':5,18,45,50,66,83,87,136,141,202,206,210 'day':60,92,107,212 'demand':74 'descript':221 'endpoint':37,79,128,161,235 'exchang':70 'extend':109 'field':222 'foreign':69 'free':184 'fulli':228 'fx':2,15 'fx-settlement-dates' 'gateway':180 'given':144 'gotobi':3,16,28,43,49,86,119,135,140,205,209 'gotobi trading dates' 'gotobi-date-lookup' 'gotobi.hugen.tokyo':124 'holiday':10,23,101,155 'holiday-adjusted-dates' 'host':122 'human':219 'human-read':218 'includ':199 'integ':214 'japan holiday calendar' 'japanes':1,14,42,68,99,153 'japanese business calendar' 'japanese settlement dates' 'japanese-holiday-calendar' 'key':64,182 'last':59 'list':138 'lookup':6,19 'market':71 'mcp':179 'mm':150 'month':63,145,147 'next':7,20,41,85,204 'number':90 'occurr':8,21 'offer':127 'openapi':224 'openapi-3.1-spec' 'paid':160 'part':115 'pay':191 'payabl':36 'per':165 'preced':105 'protocol':172 'public':100,154 'publish':229 'python':192 'queri':152 'readabl':220 'relat':46 'respons':195 'return':39,80 'schema':196,232 'sdk':193 'servic':121 'settlement':65 'shift':102 'spec':226 'special':33 'spike':76 'string':203,211 'today':48,81,132,200 'trial':185 'type':231 'typic':75 'upcom':208 'usd/jpy':73 'usdc':164 'usdc-base-settlement' 'via':169 'whether':131 'x402':35,171,190 'x402-pay':189 'x402-payable':34 'x402-payment' 'yyyi':149 'yyyy-mm':148 '五十日':4,17,44","prices":[{"id":"7832d269-e334-4342-82b1-909498da29bf","listingId":"d798492c-2b35-4c61-aa38-03fae5441d9a","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x29322Ea7EcB34aA6164cb2ddeB9CE650902E4f60","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x29322Ea7EcB34aA6164cb2ddeB9CE650902E4f60","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"},"payTo":"4du4AfkjJEwch2zk3shkPJVZfyJHNDnNjEWC6AboaS5Z","amount":"5000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:37.852Z"}],"sources":[{"listingId":"d798492c-2b35-4c61-aa38-03fae5441d9a","source":"x402_bazaar","sourceId":"https://gotobi.hugen.tokyo/gotobi/next","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:37.852Z","lastSeenAt":"2026-04-22T16:33:16.079Z"}],"details":{"listingId":"d798492c-2b35-4c61-aa38-03fae5441d9a","quickStartSnippet":"# Using x402-pay Python SDK (no wallet setup needed)\npip install x402-pay\n\nimport x402_pay\nresp = x402_pay.get('https://gotobi.hugen.tokyo/gotobi/next')\nprint(resp.json())","exampleRequest":null,"exampleResponse":{"today":"2026-02-19","days_until":1,"description":"The next gotobi date is 2026-02-20, which is 1 day away.","next_gotobi_date":"2026-02-20"},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The API describes itself as 'The only programmatic source for Japanese FX gotobi (五十日) dates' with coverage through 2099","source_url":"https://gotobi.hugen.tokyo/docs"},{"claim":"The /gotobi/next endpoint returns today, next_gotobi_date, days_until, and description fields","source_url":"https://gotobi.hugen.tokyo/docs"},{"claim":"Payment is $0.01 USDC on Base via x402","source_url":"https://gotobi.hugen.tokyo/gotobi/next"},{"claim":"Alternative access via MCP gateway, API key, or x402-pay Python SDK","source_url":"https://gotobi.hugen.tokyo/gotobi/next"},{"claim":"Sample response shows today=2026-02-19, next_gotobi_date=2026-02-20, days_until=1","source_url":"https://gotobi.hugen.tokyo/gotobi/next"}],"useCases":["Algorithmic FX trading strategies that need to anticipate USD/JPY demand spikes on gotobi dates","Scheduling or alerting systems that track Japanese financial settlement cycles","Portfolio management tools that factor in Japanese market calendar effects","AI agents that need structured calendar data for Japanese FX market analysis"],"bestFor":["FX traders and quant strategies focused on USD/JPY gotobi effects","Automated trading bots needing machine-readable Japanese settlement calendars","Financial data pipelines requiring holiday-adjusted gotobi dates through 2099"],"notFor":["General-purpose world holiday calendars (only covers Japanese public holidays relevant to gotobi)","Real-time FX price data or trade execution","Non-financial calendar scheduling needs"],"kindDetails":{},"updatedAt":"2026-04-22T02:21:25.686Z"}}