v2.0.0

Release Notes - Massive Go Client v2.0.0 (breaking changes)

This is a major breaking release of the Go client as part of our company rebrand from Polygon.io to Massive.com. Polygon.io has rebranded as Massive.com effective October 30, 2025.
Existing API keys, accounts, and integrations continue to work exactly as before.

This release introduces a new module path for v2:

module github.com/massive-com/client-go/v2

The client continues to provide identical APIs, methods, and data models, with only the import paths and default API domains updated to reflect the new brand.

Breaking Changes

• The module path has changed to github.com/massive-com/client-go/v2.
• Default REST base URL updated from https://api.polygon.io → https://api.massive.com.
• Default WebSocket base URL updated from wss://socket.polygon.io → wss://socket.massive.com.
• All internal package references now use the new massive-com organization path.

No functional or behavioral changes are introduced. All client interfaces and method signatures remain identical.

Migration Guide

To upgrade, update your go.mod to import the new v2 module:

go get github.com/massive-com/client-go/[email protected]

Then update your imports:

import "github.com/massive-com/client-go/v2/rest"

All API keys, accounts, and integrations continue to function without modification.
If you continue using the legacy github.com/polygon-io/client-go module, it will remain supported for an extended transition period.

Additional Information

• No changes to client interfaces, request/response types, or models.
• Both API domains (polygon.io and massive.com) are fully operational in parallel.
• For background, see our blog post: Polygon.io is Now Massive.
• For support, open an issue or contact [email protected].

What's Changed

• Rebrand massive by @justinpolygon in #554

Full Changelog: v1.16.18...v2.0.0