This may be the least stupid use of the block chain I've ever heard of.
Mind you Visa could have implemented this when everyone first asked back in 1999, but hey here we are. Rather than micro payments instead we let ads do their best to ruin western civilization.
Genuine question: why do you need the blockchain to do this? I use Kagi's search API with AI. No blockchain. Just great search.
If need to use an API, needs to do: user creation, top-up some money, create a token, store the token somewhere, pass it to the agent... and later renew the token...
With a blockchain, no need for all of that. And you can only pay for few cents, no need to top-up a full 5$ min for each services. If you have dozens of services that you need to reach, the benefits start to be interesting.
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You need micropayments. Banks and creditcards don't do those (and the WebPayments W3C API proposal failed due to that) because there is not much money to make in micropayments. It is not feasible to answer customer service calls for $0.0005 charges, or issue bank statements and follow regulations for transfers in the sub-cent area. That is why they charge minimum fees for each transaction, i.e. $0.30 per transaction.
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The current financial system fails at delivering cross border micro payments.
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