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.
Reference-quality API operations across every facet — a rich contract, published governance, transparent operations, and machine-readable commercial terms.
API Evangelist profiles Polygon the way a machine reads it — 162 machine-readable artifacts across 7 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Polygon scores 68.3/100 (exemplar), with a separate agent-readiness read of 63/100 (agent native). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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How we profile Polygon
Each block below is one kind of artifact we hold for Polygon. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 71
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Polygon WebSocket API
Real-time streaming WebSocket clusters per asset class (stocks/options/indices/forex/crypto). Subscribers authenticate with an API key and subscribe to channels for trades, quot...
Polygon Aggregates API
Crypto aggregate bars.
Polygon Books API
Level-2 order book.
Polygon Contracts API
Option contract reference data.
Polygon Conversion API
Real-time currency conversion.
Polygon CorporateActions API
Stock splits and dividends.
Polygon DailyBars API
Daily open/close.
Polygon Markets API
Markets, exchanges, holidays, and status.
Polygon News API
Ticker news.
Polygon Quotes API
FX quote endpoints.
Polygon Snapshots API
Snapshot endpoints.
Polygon Tickers API
Ticker reference and metadata.
Polygon Benzinga API
The benzinga API from Polygon — 9 operation(s) for benzinga.
Polygon Crypto:aggregates API
The crypto:aggregates API from Polygon — 7 operation(s) for crypto:aggregates.
Polygon Crypto:last:trade API
The crypto:last:trade API from Polygon — 1 operation(s) for crypto:last:trade.
Polygon Crypto:open Close API
The crypto:open-close API from Polygon — 1 operation(s) for crypto:open-close.
Polygon Crypto:snapshot API
The crypto:snapshot API from Polygon — 4 operation(s) for crypto:snapshot.
Polygon Crypto:trades API
The crypto:trades API from Polygon — 2 operation(s) for crypto:trades.
Polygon Etfglobal API
The etfglobal API from Polygon — 5 operation(s) for etfglobal.
Polygon Fable API
The fable API from Polygon — 2 operation(s) for fable.
Polygon Fed API
The fed API from Polygon — 4 operation(s) for fed.
Polygon Financials API
The financials API from Polygon — 4 operation(s) for financials.
Polygon Futures:aggregates API
The futures:aggregates API from Polygon — 1 operation(s) for futures:aggregates.
Polygon Fx:aggregates API
The fx:aggregates API from Polygon — 7 operation(s) for fx:aggregates.
Polygon Fx:conversion API
The fx:conversion API from Polygon — 1 operation(s) for fx:conversion.
Polygon Fx:last:quote API
The fx:last:quote API from Polygon — 1 operation(s) for fx:last:quote.
Polygon Fx:quotes API
The fx:quotes API from Polygon — 1 operation(s) for fx:quotes.
Polygon Fx:snapshot API
The fx:snapshot API from Polygon — 3 operation(s) for fx:snapshot.
Polygon Fx:trades API
The fx:trades API from Polygon — 1 operation(s) for fx:trades.
Polygon Global Crypto API
The global_crypto API from Polygon — 1 operation(s) for global_crypto.
Polygon Global Forex API
The global_forex API from Polygon — 1 operation(s) for global_forex.
Polygon Indices:aggregates API
The indices:aggregates API from Polygon — 6 operation(s) for indices:aggregates.
Polygon Indices:snapshot API
The indices:snapshot API from Polygon — 1 operation(s) for indices:snapshot.
Polygon Options:aggregates API
The options:aggregates API from Polygon — 6 operation(s) for options:aggregates.
Polygon Options:last:trade API
The options:last:trade API from Polygon — 1 operation(s) for options:last:trade.
Polygon Options:open Close API
The options:open-close API from Polygon — 1 operation(s) for options:open-close.
Polygon Options:quotes API
The options:quotes API from Polygon — 1 operation(s) for options:quotes.
Polygon Options:snapshot API
The options:snapshot API from Polygon — 2 operation(s) for options:snapshot.
Polygon Options:trades API
The options:trades API from Polygon — 1 operation(s) for options:trades.
Polygon Reference API
Reference API
Polygon Reference:conditions API
The reference:conditions API from Polygon — 1 operation(s) for reference:conditions.
Polygon Reference:dividends API
The reference:dividends API from Polygon — 1 operation(s) for reference:dividends.
Polygon Reference:exchanges API
The reference:exchanges API from Polygon — 1 operation(s) for reference:exchanges.
Polygon Reference:news API
The reference:news API from Polygon — 1 operation(s) for reference:news.
Polygon Reference:options:contract API
The reference:options:contract API from Polygon — 1 operation(s) for reference:options:contract.
Polygon Reference:options:contracts:list API
The reference:options:contracts:list API from Polygon — 1 operation(s) for reference:options:contracts:list.
Polygon Reference:related:companies API
The reference:related:companies API from Polygon — 1 operation(s) for reference:related:companies.
Polygon Reference:sec:filing API
The reference:sec:filing API from Polygon — 1 operation(s) for reference:sec:filing.
Polygon Reference:sec:filing:file API
The reference:sec:filing:file API from Polygon — 1 operation(s) for reference:sec:filing:file.
Polygon Reference:sec:filing:files API
The reference:sec:filing:files API from Polygon — 1 operation(s) for reference:sec:filing:files.
Polygon Reference:sec:filings API
The reference:sec:filings API from Polygon — 1 operation(s) for reference:sec:filings.
Polygon Reference:stocks API
The reference:stocks API from Polygon — 2 operation(s) for reference:stocks.
Polygon Reference:stocks:ipos API
The reference:stocks:ipos API from Polygon — 1 operation(s) for reference:stocks:ipos.
Polygon Reference:stocks:market API
The reference:stocks:market API from Polygon — 2 operation(s) for reference:stocks:market.
Polygon Reference:tickers:get API
The reference:tickers:get API from Polygon — 2 operation(s) for reference:tickers:get.
Polygon Reference:tickers:list API
The reference:tickers:list API from Polygon — 1 operation(s) for reference:tickers:list.
Polygon Reference:tickers:types API
The reference:tickers:types API from Polygon — 1 operation(s) for reference:tickers:types.
Polygon Snapshot API
The Snapshot API from Polygon — 1 operation(s) for snapshot.
Polygon Stocks:aggregates API
The stocks:aggregates API from Polygon — 7 operation(s) for stocks:aggregates.
Polygon Stocks:last:quote API
The stocks:last:quote API from Polygon — 1 operation(s) for stocks:last:quote.
Polygon Stocks:last:trade API
The stocks:last:trade API from Polygon — 1 operation(s) for stocks:last:trade.
Polygon Stocks:open Close API
The stocks:open-close API from Polygon — 2 operation(s) for stocks:open-close.
Polygon Stocks:quotes API
The stocks:quotes API from Polygon — 2 operation(s) for stocks:quotes.
Polygon Stocks:snapshot API
The stocks:snapshot API from Polygon — 3 operation(s) for stocks:snapshot.
Polygon Stocks:trades API
The stocks:trades API from Polygon — 2 operation(s) for stocks:trades.
Polygon Summaries API
The Summaries API from Polygon — 1 operation(s) for summaries.
Polygon Tmx API
The tmx API from Polygon — 1 operation(s) for tmx.
Polygon Us Futures API
The us_futures API from Polygon — 8 operation(s) for us_futures.
Polygon Us Options API
The us_options API from Polygon — 3 operation(s) for us_options.
Polygon Us Stocks All API
The us_stocks_all API from Polygon — 2 operation(s) for us_stocks_all.
Polygon Us Stocks Reference API
The us_stocks_reference API from Polygon — 3 operation(s) for us_stocks_reference.
Scroll within the panel for all 71 ·
Postman Collections 17
A runnable collection turns the contract into something a developer can execute in seconds. We profile them because the fastest way to trust an API is to make a real call against it.
Ready-to-run Postman collections for exercising this provider's APIs.
Polygon Crypto REST API
POSTMANPolygon Forex REST API
POSTMANPolygon Indices REST API
POSTMANPolygon Options REST API
POSTMANPolygon Reference REST API
POSTMANPolygon Stocks REST API
POSTMANScroll within the panel for all 17 ·
Open Collections 19
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONPolygon Crypto REST Aggregates API
OPEN COLLECTIONPolygon Crypto REST Aggregates Books API
OPEN COLLECTIONPolygon Crypto REST Aggregates Contracts API
OPEN COLLECTIONPolygon Crypto REST Aggregates Conversion API
OPEN COLLECTIONPolygon Crypto REST Aggregates CorporateActions API
OPEN COLLECTIONPolygon Crypto REST API
OPEN COLLECTIONPolygon Crypto REST Aggregates DailyBars API
OPEN COLLECTIONPolygon Forex REST API
OPEN COLLECTIONPolygon Indices REST API
OPEN COLLECTIONPolygon Crypto REST Aggregates Markets API
OPEN COLLECTIONPolygon Crypto REST Aggregates News API
OPEN COLLECTIONPolygon API
OPEN COLLECTIONPolygon Options REST API
OPEN COLLECTIONPolygon Crypto REST Aggregates Quotes API
OPEN COLLECTIONPolygon Reference REST API
OPEN COLLECTIONPolygon Crypto REST Aggregates Snapshots API
OPEN COLLECTIONPolygon Stocks REST API
OPEN COLLECTIONPolygon Crypto REST Aggregates Tickers API
OPEN COLLECTIONScroll within the panel for all 19 ·
Arazzo Workflows 12
Real integrations are rarely a single call. Arazzo describes the multi-step sequences — auth, then create, then confirm — so both a human and an agent can follow the choreography, not just the endpoints.
Multi-step API workflows described with the Arazzo specification.
Polygon Corporate Actions Review
Resolve a ticker, then list its stock splits and dividends history.
ARAZZOPolygon Crypto Daily Comparison
Check market status, snapshot a crypto pair, and read its daily open/close.
ARAZZOPolygon Crypto Pair Analysis
Snapshot a crypto pair, pull its aggregate bars, and read its Level-2 order book.
ARAZZOPolygon Forex Pair Analysis
Read a currency pair's last quote, convert an amount, and pull its aggregate bars.
ARAZZOPolygon Grouped Market Scan
Check market status, pull grouped daily bars for all US stocks, and profile one symbol.
ARAZZOPolygon Index Analysis
Snapshot an index, pull its aggregate bars, and read its previous close.
ARAZZOPolygon Market-Gated Stock Daily Snapshot
Check current US market status, then pull a stock's daily open/close and previous close.
ARAZZOPolygon Options Chain Scan
Resolve an underlying's details, scan its options chain, and read its previous close.
ARAZZOPolygon Options Contract Deep Dive
List an underlying's option contracts, snapshot the top contract, and pull its bars.
ARAZZOPolygon Stock Research
Resolve a stock ticker's reference details, pull its aggregate bars, and read its previous close.
ARAZZOPolygon Ticker Discovery and Profile
Search active stock tickers, resolve the top match's details, and pull its recent bars.
ARAZZOPolygon Ticker News Context
Resolve a ticker's details, pull recent news, and read its previous close.
ARAZZOScroll within the panel for all 12 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Polygon Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Polygon Finops
FINOPSFeatures 5
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Multi-asset market data
Unified REST and WebSocket surface for stocks, options, indices, forex, crypto, and futures.
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.
Event Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Polygon WebSocket Streaming API
Polygon real-time market data WebSocket clusters. Each asset class (stocks, options, indices, forex, crypto) has its own dedicated cluster at `wss://socket.polygon.io/{cluster}`...
ASYNCAPISemantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Polygon Context
JSON-LDSpectral Rules 3
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
JSON Schema 5
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
Polygon Aggregate Bar
JSON SCHEMAPolygon Options Contract
JSON SCHEMAPolygon NBBO Quote Tick
JSON SCHEMAPolygon Ticker
JSON SCHEMAPolygon Trade Tick
JSON SCHEMAJSON Structure 3
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Polygon Aggregate Bar Structure
JSON STRUCTUREPolygon Options Contract Structure
JSON STRUCTUREPolygon Ticker Structure
JSON STRUCTUREExamples 5
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 5
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
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 4
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
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 3
Packaged solutions the provider offers on top of the raw API surface.
Packaged solutions this provider offers.
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.
Resources
Every other property we hold for Polygon — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 4
Portal, sign-up, and the first successful call
Documentation 3
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 21
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 21 ·
Build 10
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 10 ·
Access & Security 3
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 5
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/polygon · machine-readable index on apis.io
This is an independent, third-party profile of Polygon, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
info@apievangelist.com
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.