{"uid":"cap_T_iNlB30Wnb6Uo2UJPzt8","slug":"market-calendar-api-index-rebalancing-reconstitution-dates-ba7da847","name":"Market Calendar API – Index Rebalancing & Reconstitution Dates","description":"Returns index rebalancing and reconstitution dates (S&P 500, Nasdaq-100, Russell US semi-annual, DAX reviews) for a year: effective-after-close date and first trading day with new weights.","url":"https://market-calendar-api.onrender.com/v1/rebalance?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":[],"properties":{"year":{"type":"string","description":"Year, e.g. 2027"},"index":{"type":"string","description":"SP500, NDX, RUSSELL, DAX or ALL"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_QTl-E4CCTiL86UOddfihm","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns scheduled index rebalancing and reconstitution dates for S&P 500, Nasdaq-100, Russell US, and DAX for a given year, including effective-after-close date and first trading day with new weights.","exampleAgentPrompt":"What are all the index rebalancing and reconstitution dates for 2025 across S&P 500, Nasdaq-100, Russell, and DAX — including the effective-after-close date and the first trading day with new weights for each?","exampleUseCases":[{"title":"Russell reconstitution planning for 2025","prompt":"Can you pull up all the Russell US index reconstitution dates for 2025, specifically the effective-after-close date and the first trading day with the new weights?"},{"title":"Full multi-index rebalancing calendar","prompt":"I need a complete list of every index rebalancing event for 2026 across all major indices — S&P 500, Nasdaq-100, Russell, and DAX — with their effective dates and when new weights take effect."},{"title":"DAX review schedule lookup","prompt":"When are the DAX review and reconstitution dates for 2025? I want to know the exact effective date and the first trading day with updated index weights."}],"resultDescription":"A list of rebalancing/reconstitution events for the requested index and year, each containing the index name, effective-after-close date, and the first trading day on which new weights apply.","failureModes":["Invalid or unsupported year returns an error or empty result","Unknown index string (e.g. typo) returns no data or validation error","No data available for far-future years beyond the calendar's coverage","Service unavailability on Render free-tier cold starts may cause timeout"],"whenToPreferThis":"Choose this endpoint when you need structured, machine-readable rebalancing and reconstitution calendars for major equity indices (S&P 500, Nasdaq-100, Russell US, DAX) by year. Ideal for quantitative strategies, portfolio rebalancing automation, event-driven trading preparation, or building financial calendars that need to track when index compositions and weights change.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T07:05:48.899Z","isFirstParty":false,"canonicalSlug":"market-calendar-api-index-rebalancing-reconstitution-dates-ba7da847"}