Massive (ex-Polygon.io) News vs Guardian Open Platform: full comparison for 2026
Quick verdict
Massive (ex-Polygon.io) News (3.8/5) edges ahead of Guardian Open Platform (3.8/5) overall. Massive (ex-Polygon.io) News is the better choice for trading-app developers already using Polygon or Massive data. Guardian Open Platform is the stronger option for students and researchers needing free full-text articles. The right pick depends on your budget, how much history you need and whether you need full text.
Massive (ex-Polygon.io) News vs Guardian Open Platform: head-to-head summary
| Criterion | Massive (ex-Polygon.io) News | Guardian Open Platform |
|---|---|---|
| Founded | 2016 | 1821 |
| HQ | Atlanta, Georgia, USA | London, UK |
| Team size | Not publicly disclosed | 1,000+ (Guardian Media Group) |
| Rating | 3.8 / 5 | 3.8 / 5 |
| Primary differentiator | Per-ticker sentiment with a written reason, included in stock data plans | Free full article bodies from a major newspaper, with editorial tags |
| Pricing model | Monthly plans per asset class | Free developer key; commercial licence on request |
| Entry price | $29/mo | Free |
| Formats & SDKs | REST API, JSON, WebSocket | REST API, JSON |
| Typical uses | Financial services, Research & academia | Research & academia, News & content apps, AI & LLM apps |
Massive (ex-Polygon.io) News vs Guardian Open Platform: overview
Massive (ex-Polygon.io) News
Massive is the name Polygon.io took on October 30, 2025. The company was founded in Atlanta around 2016 by Quinton Pike, and old api.polygon.io endpoints keep working beside the new api.massive.com base. Its ticker news endpoint returns recent articles for a symbol with summaries, publisher details and an insights array giving a sentiment label and a one-sentence reason for each ticker mentioned. Sentiment only exists for articles published after July 2, 2024. Ticker news is included in every Stocks plan: the free Basic tier reaches two years of history, and Stocks Starter costs $29 a month. Official SDKs cover Python, Go, JavaScript and more, and flat files can be pulled from S3.
Guardian Open Platform
The Guardian's Open Platform exposes the same content API that powers the Guardian's websites and apps. A free developer key returns full article bodies with tags and sections back to 1999, and commonly reported limits are about 5,000 calls a day and 12 a second. The key is for non-commercial projects; commercial use needs a deal with Guardian News & Media. Developers like it for teaching because the tagging is consistent and the responses are predictable, which makes it a good dataset for NLP exercises. The obvious limit is that every article comes from one newspaper.
Features: Massive (ex-Polygon.io) News vs Guardian Open Platform
| Capability | Massive (ex-Polygon.io) News | Guardian Open Platform |
|---|---|---|
| Full article text | ✗ | ✓ |
| Historical archive | ✓ | ✓ |
| NLP enrichment | ✓ | ✗ |
| Story/event clustering | ✗ | ✗ |
| Official SDK | ✓ | ✗ |
| Streaming or webhooks | ✗ | ✗ |
| Free access | ✓ | ✓ |
Formats and SDKs: Massive (ex-Polygon.io) News vs Guardian Open Platform
| Format / SDK | Massive (ex-Polygon.io) News | Guardian Open Platform |
|---|---|---|
| REST API | ✓ | ✓ |
| Python SDK | ✓ | N/A |
| Node.js SDK | ✓ | N/A |
| Webhooks | N/A | N/A |
| WebSocket | ✓ | N/A |
| MCP server | N/A | N/A |
| S3/bulk delivery | ✓ | N/A |
| BigQuery | N/A | N/A |
Pricing comparison: Massive (ex-Polygon.io) News vs Guardian Open Platform
| Criterion | Massive (ex-Polygon.io) News | Guardian Open Platform |
|---|---|---|
| Entry price | $29/mo | Free |
| Pricing model | Monthly plans per asset class | Free developer key; commercial licence on request |
| Access models | Free tier, Monthly plans, Enterprise contract | Free tier, Enterprise contract |
| Price transparency | Public price | Public price |
| Price tier | Budget | Free |
Who each API suits: Massive (ex-Polygon.io) News vs Guardian Open Platform
| Dimension | Massive (ex-Polygon.io) News | Guardian Open Platform |
|---|---|---|
| Buyer type | Individuals to enterprise | Individuals to enterprise |
| Typical uses | Financial services, Research & academia | Research & academia, News & content apps, AI & LLM apps |
| Example use cases | News beside charts in a trading app. Explaining price moves with sentiment reasons. | NLP coursework with real articles. Coverage studies of UK and world news over time. |
| How you get access | Free tier | Free tier |
Massive (ex-Polygon.io) News vs Guardian Open Platform: pros and cons
| Massive (ex-Polygon.io) News | |
|---|---|
| + | News comes with every Stocks plan, including the free one |
| + | Sentiment includes a short explanation you can show users |
| + | Mature SDKs and WebSocket streams for prices |
| + | Old Polygon code keeps working after the rebrand |
| - | Sentiment is missing for anything before July 2024 |
| - | Covers listed companies only |
| - | Each asset class is billed separately |
| Guardian Open Platform | |
|---|---|
| + | Full text at no cost |
| + | Clean tags and sections for filtering |
| + | More than 25 years of archive |
| + | Stable, well-documented, used in production by the Guardian itself |
| - | One publisher and one editorial voice |
| - | Commercial projects must negotiate a licence |
Who should choose Massive (ex-Polygon.io) News?
A typical fit: news beside charts in a trading app.
Per-ticker sentiment with a written reason, included in stock data plans. Paid access starts at $29/mo. Typical uses: Financial services, Research & academia.
Who should choose Guardian Open Platform?
A typical fit: NLP coursework with real articles.
Free full article bodies from a major newspaper, with editorial tags. Paid access starts at Free. Typical uses: Research & academia, News & content apps, AI & LLM apps.
Decision matrix: Massive (ex-Polygon.io) News vs Guardian Open Platform
| Your situation | Recommended choice |
|---|---|
| You want to start free before paying | Both |
| Your budget is at the lower end | Guardian Open Platform |
| You need full article text in the response | Guardian Open Platform |
| You need years of historical news | Both |
| You want an official SDK | Massive (ex-Polygon.io) News |
| You are wiring news into an LLM agent | Both work through plain REST calls |
Use case fit: Massive (ex-Polygon.io) News vs Guardian Open Platform
| Use case | Massive (ex-Polygon.io) News fit | Guardian Open Platform fit | Winner |
|---|---|---|---|
| Financial services | Strong | Limited | Massive (ex-Polygon.io) News |
| Research & academia | Strong | Strong | Both equally |
| News & content apps | Limited | Strong | Guardian Open Platform |
| AI & LLM apps | Limited | Strong | Guardian Open Platform |
Verdict: Massive (ex-Polygon.io) News vs Guardian Open Platform
Massive (ex-Polygon.io) News (3.8/5) is the stronger overall choice as a news data source. Per-ticker sentiment with a written reason, included in stock data plans.
Guardian Open Platform (3.8/5) is worth a look if you need coverage studies of UK and world news over time. If your situation matches that, Guardian Open Platform is a competitive option.
Related comparisons
Massive (ex-Polygon.io) News vs Guardian Open Platform FAQ
Is Massive (ex-Polygon.io) News better than Guardian Open Platform?
Massive (ex-Polygon.io) News (3.8/5) scores higher overall, but "better" depends on your use case. Massive (ex-Polygon.io) News's strongest advantage: news comes with every Stocks plan, including the free one. Guardian Open Platform's strongest advantage: full text at no cost.
How do Massive (ex-Polygon.io) News and Guardian Open Platform differ in pricing?
Massive (ex-Polygon.io) News: monthly plans per asset class, with paid access from $29/mo. Guardian Open Platform: free developer key; commercial licence on request, with paid access from Free. Both offer some free access for testing.
Which is better for enterprise: Massive (ex-Polygon.io) News or Guardian Open Platform?
Both sell enterprise contracts. Neither carries licensed publisher content, so check copyright terms before republishing anything.
What are the main differences between Massive (ex-Polygon.io) News and Guardian Open Platform?
What sets Massive (ex-Polygon.io) News apart: per-ticker sentiment with a written reason, included in stock data plans. What sets Guardian Open Platform apart: free full article bodies from a major newspaper, with editorial tags. They also differ on entry price ($29/mo vs Free) and typical uses (Financial services, Research & academia vs Research & academia, News & content apps).
Verify all details directly with each API before making a decision.