PontoFato
Brazilian postal codes (CEP) with IBGE coordinates, addresses and the companies registered there
Forward & Reverse Batch Geocoding REST API.
positionstack API is a free Geocoding API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Build location-based apps with Positionstack’s geocoding API. Get real-time forward/reverse geocoding, global data, and easy integration in JSON.
Details from positionstack.com.

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Brazilian postal codes (CEP) with IBGE coordinates, addresses and the companies registered there
Provide geolocation data based on postcode for Dutch addresses
The positionstack API is provided by Positionstack (positionstack.com). Build location-based apps with Positionstack’s geocoding API. Get real-time forward/reverse geocoding, global data, and easy integration in JSON.
Yes. The positionstack API is listed in the Geocoding 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 positionstack API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the positionstack API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The positionstack API is served over HTTPS, so it's safe to use in production.