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Polygon Provider

PolygonProvider remains available as a deprecated compatibility alias for existing Polygon.io integrations. Polygon.io rebranded to Massive.com, and existing Polygon API keys continue to work.

New code should use:

from ml4t.data.providers import MassiveProvider

Set MASSIVE_API_KEY for new environments. Existing POLYGON_API_KEY values are still supported.

See the canonical Massive provider documentation for current coverage, examples, and limitations.