Is Massive (formerly Polygon.io) open source?

Partly. Some of Massive (formerly Polygon.io) is published as source (https://github.com/massive-com/mcp_massive) and some is not. Checked as of 2026-09-22.

Which chains does Massive (formerly Polygon.io) support?

Massive (formerly Polygon.io) lists support for Base as of 2026-09-22.

Is Massive (formerly Polygon.io) still maintained?

Sato Hub has no activity signal for Massive (formerly Polygon.io); it cannot say whether it is maintained.

How do I install or run Massive (formerly Polygon.io)?

Sato Hub has no deploy spec for Massive (formerly Polygon.io); follow the project's own documentation at https://massive.com/blog/x402-payments-for-ai-agents.

Is Massive (formerly Polygon.io) verified on Sato Hub?

No independent verification is on record for Massive (formerly Polygon.io); its verification status is "Self-Reported". Self-reported is not verified, and the score is not a safety, quality or returns grade.

← Back to directory

Data ToolActiveSelf-Reported

Massive (formerly Polygon.io)

Name: Massive (formerly Polygon.io)
Author: Massive

Massive (formerly Polygon.io) is a tool/service by Massive, partly open source, on Base.

US stock market data API (formerly Polygon.io); agents buy it per request over x402 at agent.massive.com with no account.

Website ↗Docs ↗GitHub ↗

Next step

Watch Massive (formerly Polygon.io)

One email if what we observe changes — its repo goes quiet or disappears, or the listing is retired. Nothing else.

Check it from your agent

Add Sato Hub’s MCP server (no key), then ask:

https://satohub.ai/api/mcp

Run Sato Hub Preflight on massive-com/mcp_massive before I use it.

Full setup: Claude Code, Cursor, others →

Your project?

Prove you control the domain and correct this page — description, links, tags, chains. A claim proves control, not verification: it never changes the Sato Score.

Claim this listing →

Overview

Massive, formerly Polygon.io, provides US stock market data: tickers, snapshots, OHLC aggregates, dividends, splits, filings and news. Since 1 September 2026 agents can buy it one request at a time, paying USDC on Base on dedicated x402 routes at agent.massive.com built with Coinbase, with no account or API key (https://massive.com/blog/x402-payments-for-ai-agents). Keyed customers also get an open-source MCP server (https://github.com/massive-com/mcp_massive) and a hosted remote MCP. Listed in the curated x402 catalog of Coinbase for Agents (https://docs.cdp.coinbase.com/coinbase-for-agents/overview), so an agent connected to a Coinbase account can pay for it from its USDC balance.

Details

Chains: Base
Agent types: Data Provider
Open source: Partial
Pricing: Subscription API, or pay per request in USDC over x402
Deploys as: Hosted/Remote
Last checked: 2026-09-22

Marketplace Signals

No marketplace signals recorded for this resource yet.

Verification status reflects evidence reviewed by Sato Hub. Self-reported claims are never presented as verified.

#equities#stocks#market-data#filings#x402#mcp#coinbase-for-agents#api

Where Massive (formerly Polygon.io) fits

Trading Payments Data

See something inaccurate or outdated?Submit a correction →

Listing History

Recorded changes to Massive (formerly Polygon.io)'s listing — status, verification, Sato Score, and recent releases. Full history is kept in the listing record.

Sep 23, 2026
Listed on Sato Hub

Compared with

Alternatives to Massive (formerly Polygon.io) →

Related Resources

Coinbase AgentKit

Active

Framework

Coinbase's toolkit for giving AI agents wallets and the ability to take onchain actions.

BaseEthereumMultichain

Active★ 1.3k

Hyperliquid

Active

VenueVerified

Onchain perpetual futures and spot DEX running on its own L1 with an HyperEVM smart-contract layer.

MultichainHyperliquid

Active▸ Jun 2023

Model Context Protocol (MCP)

Active

Standard

Anthropic's open standard for connecting AI systems to external tools and data sources.

Unknown

Active

Questions people ask about Massive (formerly Polygon.io)

Is Massive (formerly Polygon.io) open source?: Partly. Some of Massive (formerly Polygon.io) is published as source (https://github.com/massive-com/mcp_massive) and some is not. Checked as of 2026-09-22.
Which chains does Massive (formerly Polygon.io) support?: Massive (formerly Polygon.io) lists support for Base as of 2026-09-22.
Is Massive (formerly Polygon.io) still maintained?: Sato Hub has no activity signal for Massive (formerly Polygon.io); it cannot say whether it is maintained.
How do I install or run Massive (formerly Polygon.io)?: Sato Hub has no deploy spec for Massive (formerly Polygon.io); follow the project's own documentation at https://massive.com/blog/x402-payments-for-ai-agents.
Is Massive (formerly Polygon.io) verified on Sato Hub?: No independent verification is on record for Massive (formerly Polygon.io); its verification status is "Self-Reported". Self-reported is not verified, and the score is not a safety, quality or returns grade.

Cite this page

Sato Hub. "Massive (formerly Polygon.io) — Sato Hub." Sato Hub, updated 2026-09-22, accessed 2026-09-23. https://satohub.ai/resources/massive

Data last refreshed 2026-09-22; this page is rebuilt daily. Citations carry the date so a reader can tell which snapshot a claim came from. Catalog data is licensed CC-BY-4.0.

Join the Sato Hub Briefing

One email a week — the agents, tools, and infrastructure that actually shipped, and why they matter.