Polygon

Polygon (Polygon.io, rebranded as Massive in early 2026) provides real-time and historical market data APIs across US stocks, options, indices, forex, cryptocurrencies, and futures. Coverage is delivered through REST endpoints and WebSocket streams under a single api.polygon.io surface plus an S3 flat files product, with tiered subscription plans for retail developers and Business contracts for redistribution and exchange-licensed data.

Polygon publishes 7 APIs on the APIs.io network, including Stocks API, Options API, Indices API, and 4 more. Tagged areas include Finance, Fintech, Market Data, Stocks, and Options.

The Polygon catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 3 Spectral governance rulesets.

Polygon’s developer surface includes authentication, developer portal, documentation, API reference, getting-started guide, signup flow, pricing, and 35 more developer resources.

🌐 Visit website 📡 Source on GitHub

70.1/100 exemplar ▬ flat Agent 54/100 agent ready Full breakdown ↓
scored 2026-07-21 · rubric v0.4

7 APIs 5 Features

FinanceFintechMarket DataStocksOptionsForexCryptoIndicesFuturesWebSocketsReal-timeHistoricalPublic APIs

API Rating

API Evangelist Rating How this is scored →
scored 2026-07-21 · rubric v0.4

Composite quality — 70.1/100 · exemplar

Contract Quality 17.4 / 25

Developer Ergonomics 14.3 / 20

Commercial Clarity 16.8 / 20

Operational Transparency 6.8 / 13

Governance 7.9 / 12

Discoverability 6.8 / 10

Agent readiness — 54/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 15 / 15

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/polygon: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

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Rate Limits

Polygon Rate Limits

6 limits

RATE LIMITS

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Real-time and historical

Sub-second live feeds plus 20+ years of historical aggregates depending on tier.

WebSocket clusters per asset class

Dedicated streaming clusters for stocks, options, indices, forex, and crypto subscriptions.

Flat files

S3-style daily aggregate, trade, and quote files for bulk historical loads on paid tiers.

Tiered subscriptions

Basic / Starter / Developer / Advanced / Business plans per asset class with distinct rate limits.

Use Cases

Trading platform price feeds

Power retail and institutional trading UIs with consolidated real-time quotes and bars.

Backtesting and research

Pull decades of aggregated bars and tick data for systematic strategy research.

Risk and surveillance

Stream live trades and quotes into compliance, surveillance, and risk engines.

Analytics dashboards

Build market dashboards, terminals, and embedded charts across asset classes.

Quant pipelines

Drive options Greeks, volatility surfaces, and FX hedging models with reliable feeds.

Integrations

TradingView

Polygon data feeds integrate with charting libraries used by trading apps.

Pandas and DataFrames

Python SDK returns DataFrames for direct use in research notebooks.

Snowflake and Databricks

Flat files load into modern data warehouses for SQL-based market analytics.

Kafka and streaming platforms

WebSocket feeds bridge into Kafka, Redpanda, and Kinesis for downstream processing.

Solutions

Retail brokerages and fintech apps

Tiered plans for consumer-facing investing apps and personal-finance tools.

Quant funds and prop trading

Business contracts for redistribution and full SIP / OPRA / CME exchange-licensed data.

Data and AI research

Flat files and historical APIs for ML feature engineering and financial NLP.

Get Started 4

Portal, sign-up, and the first successful call

Portal

Portal

GettingStarted

GettingStarted

Signup

Signup

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 15

Pagination, idempotency, versioning, errors, and events

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

SpectralRules

Vocabulary

JSONLD

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Build 8

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

Official Polygon (Massive) MCP Server

Tools

Official PHP SDK

SDKs

Python SDK

SDKs

JavaScript / TypeScript SDK

SDKs

Kotlin / JVM SDK

SDKs

Go SDK

SDKs

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Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

Support

Support

RateLimits

RateLimits

Commercial 5

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

FinOps

Company 2

The organization behind the API

Blog

Blog

LinkedIn

Source (apis.yml)

opencollection: 1.0.0
info:
  name: Polygon Stocks REST API
  version: '1.0'
request:
  auth:
    type: apikey
    key: apiKey
    value: '{{apiKey}}'
    placement: query
items:
- info:
    name: Aggregates
    type: folder
  items:
  - info:
      name: Get Aggregate Bars For A Stock Ticker
      type: http
    http:
      method: GET
      url: https://api.polygon.io/v2/aggs/ticker/:stocksTicker/range/:multiplier/:timespan/:from/:to
      params:
      - name: stocksTicker
        value: ''
        type: path
        description: Case-sensitive stock ticker symbol (e.g., AAPL).
      - name: multiplier
        value: ''
        type: path
        description: Size of the timespan multiplier.
      - name: timespan
        value: ''
        type: path
      - name: from
        value: ''
        type: path
        description: Start of the aggregate window (YYYY-MM-DD or millisecond timestamp).
      - name: to
        value: ''
        type: path
        description: End of the aggregate window (YYYY-MM-DD or millisecond timestamp).
      - name: adjusted
        value: ''
        type: query
      - name: sort
        value: ''
        type: query
      - name: limit
        value: ''
        type: query
    docs: 'Returns aggregate bars for a stock over a given date range in

      custom time window sizes (e.g., 5-minute bars between two dates).

      '
- info:
    name: DailyBars
    type: folder
  items:
  - info:
      name: Get Daily Open Close For A Stock Ticker
      type: http
    http:
      method: GET
      url: https://api.polygon.io/v1/open-close/:stocksTicker/:date
      params:
      - name: stocksTicker
        value: ''
        type: path
      - name: date
        value: ''
        type: path
      - name: adjusted
        value: ''
        type: query
    docs: Returns the open, close, high, and low for a stock ticker on a specific date.
  - info:
      name: Get Grouped Daily Bars For US Stocks
      type: http
    http:
      method: GET
      url: https://api.polygon.io/v2/aggs/grouped/locale/us/market/stocks/:date
      params:
      - name: date
        value: ''
        type: path
      - name: adjusted
        value: ''
        type: query
      - name: include_otc
        value: ''
        type: query
    docs: Returns daily aggregate bars for all US stock tickers on a specific date.
  - info:
      name: Get Previous Close For A Stock Ticker
      type: http
    http:
      method: GET
      url: https://api.polygon.io/v2/aggs/ticker/:stocksTicker/prev
      params:
      - name: stocksTicker
        value: ''
        type: path
      - name: adjusted
        value: ''
        type: query
    docs: Returns the previous trading day's open, close, high, and low for a stock ticker.
bundled: true