Registry / http-networking / polygon-api-client

polygon-api-client

library1.16.3pypypi✓ verified 24d ago

The official Python client for Polygon.io's REST and Websocket APIs. This package (`polygon-api-client`) reached its end of life at version `1.16.3` and is no longer maintained. For active development, new features, and bug fixes, users should migrate to the successor library, `massive-api-client`.

http-networking data

pip install polygon-api-client==1.16.3

github ↗package ↗homepage ↗docs ↗

INSTALL

IMPORT

SIG · POLYGON-API-CLIENT

polygon-api-client

http-networkingpythonv1.16.3

Install

2.3s avg

Import

909ms

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 v1.16.3 · 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

✓ —

✓ 2.45s

py 3.11

✓ —

✓ 2.4s

py 3.12

✓ —

✓ 2.15s

py 3.13

✓ —

✓ 2.2s

py 3.9

1/2 runs

47MB installed

● package 47MB

Code

Verified usage

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

RESTClient

✓ from polygon import RESTClient

WebSocketClient

✓ from polygon.websocket import WebSocketClient

Initialize the REST client and fetch basic reference data. Ensure your API key is set via environment variable or directly in the code. This version of the client defaults to the `api.polygon.io` endpoint.

import os from polygon import RESTClient # Your Polygon API key API_KEY = os.environ.get("POLYGON_API_KEY", "YOUR_API_KEY_HERE") def main(): if not API_KEY or API_KEY == "YOUR_API_KEY_HERE": print("Please set the POLYGON_API_KEY environment variable or replace 'YOUR_API_KEY_HERE' in the code.") return try: with RESTClient(API_KEY) as client: # Example: Get ticker types (endpoint availability depends on your API plan) resp = client.reference_ticker_types() print(f"Ticker Types: {resp.results}") except Exception as e: print(f"An error occurred: {e}") if __name__ == "__main__": main()

Debug

Known issues

breakingThis `polygon-api-client` package is deprecated and no longer receives updates. The official client has been rebranded and released as `massive-api-client` (version `2.x.x` and higher). All users are strongly advised to migrate to the new package (`massive-api-client`) to receive critical updates, new features, and bug fixes.

fix

Uninstall `polygon-api-client` (`pip uninstall polygon-api-client`) and install the successor `massive-api-client` (`pip install massive-api-client`). Update your code to use the new package. The core `from polygon import ...` import structure generally remains the same, but new features and endpoint changes in `massive-api-client` may require code adjustments.

affects: All versions of `polygon-api-client` (including 1.16.3)

breakingUpon migrating from `polygon-api-client` (v1.x) to `massive-api-client` (v2.x+), the default API base URL changes from `https://api.polygon.io` to `https://api.massive.com`. While `https://api.polygon.io` still functions, ensure your code explicitly sets `base_url='https://api.polygon.io'` if you must connect to the old endpoint, or adapt your systems to the new `api.massive.com` default.

fix

When initializing the client with `massive-api-client`, either allow the new `https://api.massive.com` default or explicitly specify `RESTClient(API_KEY, base_url='https://api.polygon.io')`.

affects: Migration from `polygon-api-client` (v1.x) to `massive-api-client` (v2.x+)

gotchaAn API key is required for authentication with the Polygon.io API. The client will raise an error if an API key is not provided or is invalid.

fix

Pass your Polygon.io API key to the `RESTClient` or `WebSocketClient` constructor, or ensure it's available as the `POLYGON_API_KEY` environment variable.

affects: All versions

Errors

Common errors & fixes

polygon-api-client is deprecated — migrate to massive-api-client

Library reached EOL at v1.16.3, no longer maintained

fix

pip uninstall polygon-api-client && pip install massive-api-client — see https://checklist.day/registry/massive-api-client

ModuleNotFoundError: No module named 'polygon'

polygon-api-client not installed

fix

pip install polygon-api-client (or migrate to massive-api-client)

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

Incorrect import path

fix

from polygon import RESTClient

401 Client Error: Unauthorized for url: https://api.polygon.io

Missing or invalid POLYGON_API_KEY

fix

Set POLYGON_API_KEY env var or pass api_key= to RESTClient constructor

Upgrade

Version history

1.16.3latest on PyPI · released Oct 30, 2025

Audit

Dependencies

No dependency data recorded yet.

Agent activity

31 hits · last 30 days

node

Resources

githubhttps://github.com/polygon-io/client-python ↗

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

homepagehttps://polygon.io ↗

docshttps://polygon.io/docs ↗