FinSignals API vs Guerrilla Mail
Same instrument, two spec sheets — measured, not claimed.
FinSignals API vs Guerrilla Mail: common questions
Which is more reliable, FinSignals API or Guerrilla Mail?
On our scheduled checks, Guerrilla Mail leads on measured uptime — FinSignals API at —% versus Guerrilla Mail 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 FinSignals API and Guerrilla Mail need an API key?
Neither needs a paid key — FinSignals API is callable with no signup, and Guerrilla Mail is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call FinSignals API and Guerrilla Mail from the browser?
Yes — both FinSignals API and Guerrilla Mail 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 FinSignals API and Guerrilla Mail free for commercial use?
FinSignals API has unclear commercial terms, and Guerrilla Mail 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.