
Computes exact sales tax amounts and breakdowns for checkout and billing.
Sales Tax Calculator API is a free Finance API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Calculate sales tax, save transactions, record adjustments, submit batches, and inspect requests in the dashboard.
Details from salestaxcalculatorapi.com.

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The Sales Tax Calculator API is provided by Sales Tax Calculator API (salestaxcalculatorapi.com). Calculate sales tax, save transactions, record adjustments, submit batches, and inspect requests in the dashboard.
Yes. The Sales Tax Calculator API is listed in the Finance 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 Sales Tax Calculator API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Sales Tax Calculator API supports CORS, so front-end JavaScript can call it directly.
Yes. The Sales Tax Calculator API is served over HTTPS, so it's safe to use in production.