generated: '2026-07-22'
method: searched
source: npm, PyPI, Maven Central, Packagist, pkg.go.dev, github.com/massive-com registries and org
notes: >-
  Polygon.io rebranded to Massive in early 2026; SDK repos moved to the massive-com GitHub org
  (polygon-io URLs redirect). The JavaScript client is published under both the legacy
  @polygon.io/client-js name and the new @massive.com/client-js name. PyPI package
  "massive-api-client" is third-party (not first-party) and is excluded.
packages:
  - language: javascript
    registry: npm
    name: "@massive.com/client-js"
    url: https://www.npmjs.com/package/@massive.com/client-js
    install: npm install @massive.com/client-js
    version: 10.7.0
    repository: https://github.com/massive-com/client-js
    official: true
  - language: javascript
    registry: npm
    name: "@polygon.io/client-js"
    url: https://www.npmjs.com/package/@polygon.io/client-js
    install: npm install @polygon.io/client-js
    version: 8.2.0
    repository: https://github.com/massive-com/client-js
    official: true
    note: Legacy package name from before the Massive rebrand
  - language: python
    registry: pypi
    name: polygon-api-client
    url: https://pypi.org/project/polygon-api-client/
    install: pip install polygon-api-client
    version: 1.16.3
    repository: https://github.com/massive-com/client-python
    official: true
  - language: go
    registry: pkg.go.dev
    name: github.com/polygon-io/client-go
    url: https://pkg.go.dev/github.com/polygon-io/client-go
    install: go get github.com/polygon-io/client-go
    repository: https://github.com/massive-com/client-go
    official: true
  - language: kotlin
    registry: maven-central
    name: io.polygon.kotlin.sdk:polygon-kotlin-sdk-jvm
    url: https://central.sonatype.com/artifact/io.polygon.kotlin.sdk/polygon-kotlin-sdk-jvm
    repository: https://github.com/massive-com/client-jvm
    official: true
  - language: php
    registry: packagist
    name: polygon-io/api
    url: https://packagist.org/packages/polygon-io/api
    install: composer require polygon-io/api
    repository: https://github.com/polygon-io/client-php
    official: true
    note: Official PHP client for the REST APIs (legacy branding, low activity)
  - language: python
    registry: github
    name: mcp_massive
    url: https://github.com/massive-com/mcp_massive
    install: uv tool install "mcp_massive @ git+https://github.com/massive-com/mcp_massive@v0.10.0"
    version: v0.10.0
    official: true
    note: Official MCP server; installed from GitHub, not published to PyPI