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

v1.16.18

client-go v1.16.18 Release Notes

This minor patch release adds a deprecation notice to align with our rebrand from Polygon.io to Massive.com. No other functional changes, your existing code continues to work exactly as before. Polygon.io has rebranded as Massive.com effective October 30, 2025. Existing API keys, accounts, and integrations continue to work exactly as before. The only upcoming change will be in v2.0.0, where the SDK defaults to the new API base at api.massive.com, while api.polygon.io remains supported for an extended period.

What's Changed

• Update go.mod with deprecated notice by @justinpolygon in #552
• Bump github.com/stretchr/testify from 1.10.0 to 1.11.0 by @dependabot[bot] in #544
• feat(snapshots): add fmv_last_updated by @DanStough in #545
• refactor: route websocket data by market first for overlapping event types by @justinpolygon in #551

Full Changelog: v1.16.16...v1.16.18

v1.16.16

What's Changed

• Sync with latest futures helpers by @justinpolygon in #542

Full Changelog: v1.16.15...v1.16.16

v1.16.15

What's Changed

• Sync with latest futures beta spec by @justinpolygon in #541

Full Changelog: v1.16.14...v1.16.15

v1.16.14

What's Changed

• Adds Futures support (beta) by @justinpolygon in #514
• feat(rest): add minute candle and session last_updated to snapshot res by @DanStough in #539

New Contributors

• @DanStough made their first contribution in #539

Full Changelog: v1.16.13...v1.16.14

v1.16.13

What's Changed

• Updated ListTreasuryYields, ListShortInterest, and ListShortVolume from vX to v1 endpoints @justinpolygon in #538
• Bump github.com/jarcoal/httpmock from 1.3.1 to 1.4.0 by @dependabot in #536

Full Changelog: v1.16.12...v1.16.13

v1.16.12

What's Changed

• Adds IPOs, Short Interest/Volume, and Treasury Yields by @justinpolygon in #529
• Fix: usage of deprecated CodeQL Action version by @hamirmahal in #532

New Contributors

• @hamirmahal made their first contribution in #532

Full Changelog: v1.16.11...v1.16.12

v1.16.11

What's Changed

• fix(ws): reduce excessive websocket reconnects due to aggressive ping/pong timing by @justinpolygon in #527

Full Changelog: v1.16.10...v1.16.11

v1.16.10

What's Changed

• Adds IEX business feed by @justinpolygon in #511

Full Changelog: v1.16.9...v1.16.10

v1.16.9

What's Changed

• Add futures topics to case statement by @rlmcpherson in #492

Full Changelog: v1.16.8...v1.16.9