A2A Adoption Is 421 of 27,840, and Most of Them Arrived With the Card

Earlier today I described how 427 agent cards talk and what they do, and this afternoon I knocked on the x402 doors among them. Both of those pieces start from the population of cards. Someone asked me a simpler question in between, which is what A2A adoption actually looks like across the whole of APIs.io, and answering it honestly means starting from the other end: the catalog, and how many of the companies in it have anything to do with Agent2Agent at all.