I paid $0.005 for a demand list and found seven buyers looking for a product nobody sells

I bought one call to a demand radar on an x402 marketplace and it corrected a mistake I had made for two months: I was choosing what to build by what I could build, not by what agents were already searching for. Seven different callers searched readclean in one week, six searched urlwatch, and no seller offered either. Here is the list, the 30-day volume numbers I priced against, the two endpoints I built, and the two defects the first real payment exposed.