Marketaux vs Guardian Open Platform: full comparison for 2026
Quick verdict
Marketaux (3.9/5) edges ahead of Guardian Open Platform (3.8/5) overall. Marketaux is the better choice for fintech developers needing ticker-tagged news cheaply. 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.
Marketaux vs Guardian Open Platform: head-to-head summary
| Criterion | Marketaux | Guardian Open Platform |
|---|---|---|
| Founded | Not disclosed | 1821 |
| HQ | Not publicly disclosed | London, UK |
| Team size | Not publicly disclosed | 1,000+ (Guardian Media Group) |
| Rating | 3.9 / 5 | 3.8 / 5 |
| Primary differentiator | Entity-level sentiment on every article, free plan included | Free full article bodies from a major newspaper, with editorial tags |
| Pricing model | Monthly request plans | Free developer key; commercial licence on request |
| Entry price | $29/mo | Free |
| Formats & SDKs | REST API, JSON | REST API, JSON |
| Typical uses | Financial services, News & content apps | Research & academia, News & content apps, AI & LLM apps |
Marketaux vs Guardian Open Platform: overview
Marketaux
Marketaux saves fintech developers from writing a ticker matcher. Every stock, crypto or forex article it returns lists the entities it mentions, each with a sentiment score from -1 to 1, and that works on the free plan too. Listings put coverage at about 5,000 sources in 30+ languages and 200,000+ tracked entities (per company website; independently unverifiable). The free plan allows 100 requests a day but returns only three articles per request. The official pricing page lists Basic at $29 a month for 2,500 daily requests, and entity statistics and trending endpoints need a paid plan. The site does not say who operates it or where.
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: Marketaux vs Guardian Open Platform
| Capability | Marketaux | Guardian Open Platform |
|---|---|---|
| Full article text | ✗ | ✓ |
| Historical archive | ✗ | ✓ |
| NLP enrichment | ✓ | ✗ |
| Story/event clustering | ✗ | ✗ |
| Official SDK | ✗ | ✗ |
| Streaming or webhooks | ✗ | ✗ |
| Free access | ✓ | ✓ |
Formats and SDKs: Marketaux vs Guardian Open Platform
| Format / SDK | Marketaux | Guardian Open Platform |
|---|---|---|
| REST API | ✓ | ✓ |
| Python SDK | N/A | N/A |
| Node.js SDK | N/A | N/A |
| Webhooks | N/A | N/A |
| WebSocket | N/A | N/A |
| MCP server | N/A | N/A |
| S3/bulk delivery | N/A | N/A |
| BigQuery | N/A | N/A |
Pricing comparison: Marketaux vs Guardian Open Platform
| Criterion | Marketaux | Guardian Open Platform |
|---|---|---|
| Entry price | $29/mo | Free |
| Pricing model | Monthly request plans | Free developer key; commercial licence on request |
| Access models | Free tier, Monthly plans | Free tier, Enterprise contract |
| Price transparency | Public price | Public price |
| Price tier | Budget | Free |
Who each API suits: Marketaux vs Guardian Open Platform
| Dimension | Marketaux | Guardian Open Platform |
|---|---|---|
| Buyer type | Individuals to enterprise | Individuals to enterprise |
| Typical uses | Financial services, News & content apps | Research & academia, News & content apps, AI & LLM apps |
| Example use cases | A news tab in a portfolio tracker. Sentiment features for a hobby trading model. | NLP coursework with real articles. Coverage studies of UK and world news over time. |
| How you get access | Free tier | Free tier |
Marketaux vs Guardian Open Platform: pros and cons
| Marketaux | |
|---|---|
| + | Ticker extraction and sentiment come built in |
| + | Commercial use from $29 a month |
| + | Covers crypto and forex as well as equities |
| + | Filters by symbol, industry and exchange |
| - | Three articles per free request makes testing slow |
| - | Anonymous operator |
| - | Financial topics only |
| 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 Marketaux?
A typical fit: a news tab in a portfolio tracker.
Entity-level sentiment on every article, free plan included. Paid access starts at $29/mo. Typical uses: Financial services, News & content apps.
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: Marketaux 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 | Guardian Open Platform |
| You want an official SDK | Neither; both are plain REST |
| You are wiring news into an LLM agent | Both work through plain REST calls |
Use case fit: Marketaux vs Guardian Open Platform
| Use case | Marketaux fit | Guardian Open Platform fit | Winner |
|---|---|---|---|
| Financial services | Strong | Limited | Marketaux |
| News & content apps | Strong | Strong | Both equally |
| Research & academia | Limited | Strong | Guardian Open Platform |
| AI & LLM apps | Limited | Strong | Guardian Open Platform |
Verdict: Marketaux vs Guardian Open Platform
Marketaux (3.9/5) is the stronger overall choice as a news data source. Entity-level sentiment on every article, free plan included.
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
Marketaux vs Guardian Open Platform FAQ
Is Marketaux better than Guardian Open Platform?
Marketaux (3.9/5) scores higher overall, but "better" depends on your use case. Marketaux's strongest advantage: ticker extraction and sentiment come built in. Guardian Open Platform's strongest advantage: full text at no cost.
How do Marketaux and Guardian Open Platform differ in pricing?
Marketaux: monthly request plans, 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: Marketaux or Guardian Open Platform?
Guardian Open Platform sells enterprise contracts with negotiated volume and SLA terms. Neither carries licensed publisher content, so check copyright terms before republishing anything.
What are the main differences between Marketaux and Guardian Open Platform?
What sets Marketaux apart: entity-level sentiment on every article, free plan included. 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, News & content apps vs Research & academia, News & content apps).
Verify all details directly with each API before making a decision.