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Andrew CTO at Mad Devs explains how to not spend even a penny by using three ETA (estimated time of arrival) services instead of one. GoDee is a start-up project that offers booking seats on a bus online. Google API provides 10,000 free queries per month, after which every 1,000 queries are charged $20. Pifia micro-service uses the same amount of requests in the Google Distance Matrix API to calculate the bus’s approximate arrival time, aka ETA.