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Market Calendar API – Index Rebalancing & Reconstitution Dates
x402
Market Calendar API – Index Rebalancing & Reconstitution Dates is a paid API for AI agents from market-calendar-api.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
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.
Price / call$0.02
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Russell reconstitution planning for 2025
“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?”
Full multi-index rebalancing calendar
“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.”
DAX review schedule lookup
“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.”
Technical details
Endpoint
GEThttps://market-calendar-api.onrender.com/v1/rebalance?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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