Signaliz
GTM enrichment, lead generation, email verification, and company signals
Allows you to programmatically access and Smartsheet data and account information.
Smartsheet API is a free Business API that requires OAuth authentication, is served over HTTPS and does not support CORS, so it should be called from a server.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
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Get data for procurements in Hungary in JSON format
Yes. The Smartsheet API is listed in the Business category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Smartsheet API uses OAuth authentication, so you need to register for credentials before making requests.
Not directly. The Smartsheet API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The Smartsheet API is served over HTTPS, so it's safe to use in production.