TradeDataHub
U.S. contractor datasets with a free discovery API for coverage, pricing and masked previews

Email Finder for B2B sales and email marketing and email verifier.
Tomba email finder API is a free Business API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Integrate Tomba's email finder, verifier, and enrichment APIs into your app. Verified results, 13 SDKs, and 25 free searches a month on the Free plan.
Details from tomba.io.

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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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The Tomba email finder API is provided by Tomba (tomba.io). Integrate Tomba's email finder, verifier, and enrichment APIs into your app. Verified results, 13 SDKs, and 25 free searches a month on the Free plan.
Yes. The Tomba email finder 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 Tomba email finder API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Tomba email finder API supports CORS, so front-end JavaScript can call it directly.
Yes. The Tomba email finder API is served over HTTPS, so it's safe to use in production.