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If you need a precise border of the city of Porto in coordinates, then extract a city boundary. Check these pages Getting city boundaries from openstreetmap and Getting polygon boundaries of City in JSON from Google Maps API?
If only a rectangular, it is a boundig box, and you can get it here Getting bounding-box of city.
-8.691294,41.138351,-8.552009,41....
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Challenges in Machine Learning
Here you can find causality Workbench datasets Choose the one that matches your requirement. Most of the datasets were from the competitions or from the real-world data.
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If this still makes sense, there's a dataset that I'm maintaining:
https://github.com/tb0hdan/domains
TLD kinds: 1507
Country TLDs: 244
Generic TLDs: 1263
Total domains in dataset: 230,759,228
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I believe this api provides exactly what you are looking for - Amazon Price History API
I recently published it and made available virtually for free in case you only need info about a few products.
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