# Massive (formerly Polygon.io) **Canonical:** https://apis.io/providers/massive-com/ **Website:** https://massive.com **APIs profiled:** 7 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. ## Kin Score — 71.5 / 100 (exemplar) Scored 2026-09-25 under rubric 0.23.0. Trend: flat (-3.1 from 74.6). | Facet | Score | |---|---| | Discoverability | 75.0 | | Contract Quality | 70.1 | | Contract Governance | 31.8 | | Operational Transparency | 65.3 | | Developer Ergonomics | 76.8 | | Access Clarity | 81.1 | Regulatory layer — **Securities & Market Data**: 38.0 (matched via tags). ## Agent readiness — 60.6 (agent-ready) | Dimension | Value | |---|---| | Spec Presence | yes | | Agentic Access | derived | | Reversibility Documented | na | | MCP Server | verified | | Auth Clarity | served | | Idempotency | na | | Error Semantics | derived | | OpenAPI Examples | verified | | Rate Limit Signal | documented | | Event Surface Described | derived | | Agent Skills | derived | | Well Known Catalog | no | | Consent Identity | no | | Agent Card | no | | Dry Run Mode | na | | Delegated Identity | served | | Protected Resource Metadata | verified | | Dynamic Client Registration | yes | | Agentic Commerce | no | ## Access Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high). ## APIs (70) - **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 Markets API** — Markets, exchanges, holidays, and status. - **Polygon News API** — Ticker news. - **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. - …and 30 more, listed in full on the page. ## MCP servers (1) - **Massive MCP server — remote https://mcp.massive.com (OAuth) + open-source mcp_massive (stdio)** ## Agentic access (1) - **Polygon Agentic Access** — 175 operations ## Security (2) - **Polygon Authentication** — apiKey/http · 2 schemes - **Polygon Domain Security** — TLSv1.3 · HSTS · DMARC ## Plans (1) - **Polygon Plans Pricing** ## Use cases (5) - **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. ## Tags Finance, Fintech, Market Data, Stocks, Options, Forex, Crypto, Indices, Futures, WebSocket, Real-Time, Historical, Public APIs, Financial Data --- Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/massive-com/). Scores are computed from the provider's own public artifacts under a published rubric.