{"uid":"cap_t4gCyvi0lVHNeTtdeILBQ","slug":"market-calendar-api-opex-calendar-29c24add","name":"Market Calendar API – OPEX Calendar","description":"Returns all monthly options expiration dates of a year for US equity options, VIX and Eurex, holiday-adjusted, with triple witching flags.","url":"https://market-calendar-api.onrender.com/v1/opex-calendar?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["year"],"properties":{"year":{"type":"string","description":"Year, e.g. 2027"},"venue":{"type":"string","description":"all, us, vix or eurex"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_QDNKBHYWNpQBhkcAwaPIq","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns all monthly options expiration dates for a given year across US equity options, VIX, and Eurex, with holiday adjustments and triple witching flags.","exampleAgentPrompt":"Can you pull up all the monthly options expiration dates for 2025 across US equities, VIX, and Eurex, and flag which ones are triple witching?","exampleUseCases":[{"title":"Annual trading calendar setup","prompt":"Give me the full monthly options expiration calendar for 2026 for all venues — US equity, VIX, and Eurex — and highlight which dates are triple witching so I can plan my hedging schedule."},{"title":"VIX expiration scheduling","prompt":"What are all the VIX options expiration dates for 2025, holiday-adjusted? I need them in a list so I can plan my VIX positions around them."},{"title":"Eurex derivatives planning","prompt":"List all the Eurex monthly options expiration dates for 2027 so our derivatives desk can build out the trading calendar for the year."}],"resultDescription":"A structured list of monthly options expiration dates for the requested year and venue (US equity options, VIX, Eurex, or all), each entry holiday-adjusted and annotated with a boolean flag indicating whether it is a triple witching date.","failureModes":["Missing required 'year' parameter returns a validation error","Invalid or unsupported year value may return an empty result or error","Invalid 'venue' value outside the allowed enum (all/us/vix/eurex) may return an error or be ignored","Service on render.com free tier may have cold-start latency or downtime","Payment failure (x402) blocks the request before reaching the calendar logic"],"whenToPreferThis":"Use this endpoint when you need a full annual schedule of monthly options expiration dates — especially when you require triple witching flags or need to distinguish between US equity, VIX, and Eurex venues, and holiday adjustments matter. Prefer this over general financial calendar APIs when OPEX-specific data with venue segmentation is the primary need.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T06:39:38.481Z","isFirstParty":false,"canonicalSlug":"market-calendar-api-opex-calendar-29c24add"}