Registry / http-networking / massive-api-client

massive-api-client

library0.0.4pypypi✓ verified 85d ago

Official Python client for Massive.com (formerly Polygon.io) REST and WebSocket financial data APIs. Polygon.io rebranded as Massive.com on October 30, 2025. Package renamed from polygon-api-client. Import path changed from 'polygon' to 'massive'. Both api.polygon.io and api.massive.com remain operational. Current stable version follows the polygon-api-client release cadence.

http-networking payments data

pip install massive-api-client

package ↗homepage ↗

INSTALL

IMPORT

SIG · MASSIVE-API-CLIENT

massive-api-client

http-networkingpythonv0.0.4

Install

2.2s avg

Import

976ms

Disk

47MB

Pass rate

8/ 10

Env Coverage8 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.0.4 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

glibc

py 3.10

✓ —

✓ 2.35s

py 3.11

✓ —

✓ 2.33s

py 3.12

✓ —

✓ 2.1s

py 3.13

✓ —

✓ 2.13s

py 3.9

2/4 runs

47MB installed

● package 47MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

RESTClient

✓ from massive import RESTClient

✗ from polygon import RESTClient

Import path changed from 'polygon' to 'massive' in v2.0.0 as part of the Polygon.io → Massive.com rebrand. Old import still works if using polygon-api-client v1.x.

WebSocketClient

✓ from massive.websocket import WebSocketClient

✗ from polygon.websocket import WebSocketClient

Both POLYGON_API_KEY and MASSIVE_API_KEY env vars work. Existing API keys continue to function after rebrand.

import os from massive import RESTClient API_KEY = os.environ.get('POLYGON_API_KEY') or os.environ.get('MASSIVE_API_KEY') with RESTClient(API_KEY) as client: resp = client.get_aggs('AAPL', 1, 'day', '2024-01-01', '2024-01-10') for agg in resp.results: print(agg)

Debug

Known issues

breakingImport path changed from 'polygon' to 'massive' in v2.0.0. 'from polygon import RESTClient' no longer works with the new package.

fix

Update imports to 'from massive import RESTClient' and 'from massive.websocket import WebSocketClient'.

affects: >=2.0.0

breakingDefault API base URL changed from api.polygon.io to api.massive.com in v2.0.0. Both domains remain operational.

fix

If you must use the old endpoint explicitly: RESTClient(API_KEY, base_url='https://api.polygon.io')

affects: >=2.0.0

gotchaExisting POLYGON_API_KEY values continue to work with Massive.com. No key rotation needed.

fix

No action needed. Keep using your existing API key.

affects: all

Errors

Common errors & fixes

ImportError: cannot import name 'RESTClient' from 'polygon'

Using old import path after upgrading to massive-api-client v2.x.

fix

Change 'from polygon import RESTClient' to 'from massive import RESTClient'.

ModuleNotFoundError: No module named 'massive'

Still using polygon-api-client v1.x or package not installed.

fix

Run 'pip install massive-api-client' to get v2.x with the new import path.

401 Client Error: Unauthorized for url: https://api.massive.com

API key not passed or invalid.

fix

Pass API key explicitly: RESTClient(api_key=os.environ['POLYGON_API_KEY']) or set POLYGON_API_KEY env var.

Upgrade

Version history

0.0.4latest on PyPI · released Apr 14, 2026

Audit

Dependencies

No dependency data recorded yet.

Agent activity

90 hits · last 30 days

node

Bingbot

Perplexity

OpenAI (training)

Resources

packagehttps://pypi.org/project/massive-api-client/ ↗

homepagehttps://massive.com ↗