MarketAux vs The Guardian
Same instrument, two spec sheets — measured, not claimed.
MarketAux vs The Guardian: common questions
Which is more reliable, MarketAux or The Guardian?
On our scheduled checks, The Guardian leads on measured uptime — MarketAux at —% versus The Guardian at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Do MarketAux and The Guardian need an API key?
Both ask you to authenticate — MarketAux uses an API key and The Guardian uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.
Can I call MarketAux and The Guardian from the browser?
Yes — both MarketAux and The Guardian send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are MarketAux and The Guardian free for commercial use?
MarketAux has unclear commercial terms, and The Guardian has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.