Market history on your website

A historical S&P 500 observation for today's date, updated on the UTC calendar. Each card links to its source and explains what the number measures.

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Embed code

<iframe src="https://underfolio.com/embed/on-this-day" title="This day in market history by Underfolio" width="100%" height="420" style="border:0;max-width:640px" loading="lazy" referrerpolicy="no-referrer"></iframe>

No account or API key is needed. To show a fixed calendar date, add ?md=10-19 to the iframe address. Keep the attribution and source links visible.