> "I'm going to build a system for transferring money, and I am confident that nobody will ever try to defraud it" -- someone who is about to lose all their money

You seem to have conjured the impression that micropayment systems have to be radically different than current payment models, which is wildly mistaken.

You can build an effective micropayment system using only currently available tools (digital wallets, microcurrencies, digital storefronts, review systems) that have most/all of the nice properties of existing platforms, which invalidates almost every single point you make.

Few of these points seem very well thought-out - they're mostly relatively easily refuted by using logic and/or pointing to what the industry is already doing.

> pay before viewing: how do you know that the thing you're paying for is the thing that you're expecting?

In the exact same way as current digital storefronts.

> How easy is it to trick people into paying over the odds

What are "the odds"? Are we betting now?

> so do you give refunds a la steam?

Yes, exactly like current digital storefronts.

> - pay and adverts: double-dipping is very annoying

Exactly like current digital platforms (e.g. Spotify, YouTube premium).

> - pay and adverts: how do you know who you're paying?

What does this even mean - how do "adverts" factor in to "how do you know who you're paying"??

> pay and frame: can you have multiple payees per displayed page?

What does this mean??

> - pay and popups: it's going to be like those notification or app install modals, yet another annoyance for people to bounce off

A theory that is trivially dispelled by empirical evidence of the tens of billions of dollars in microtransactions that US players spend on free-to-play games. You create a microtransaction wallet currency that is roughly equivalent to normal money, and then you pay for things by clicking on them, like in a normal game with microtransactions. Empirically, people get used to this very quickly and the friction becomes unnoticeable.

> - pay limits: contactless has a £30 limit here

What does any of this have to do with contactless payments???

> Would you have the same payment system suitable for $.01 payments and $1000 payments?

It's pretty easy with a few seconds of thought to think of systems that handle both of those cases well. For instance, you can make it so you have to hold down a button to purchase something with your microcurrency, with the duration of the hold (nonlinearly) proportional to the cost of the item.

> - pay and censors: who's excluded from the payment system? Why?

Exactly the same as current platforms - the platforms/wallet providers determine that.

>> If it was that easy, it would have been done.

Objectively false. There are many good ideas that have failed because of market factors or poor marketing. In this case, the prevalence of ads, and people's generosity at a time before scraping has truly taken off, is subsidizing the market. The generosity will decrease and doesn't scale, and I shouldn't have to point out the problems with ads.

> - getting money into the system is plagued by usual fraud problems of card TX for pure digital goods

So you handle that exactly the same way as current platforms - you use a payment processor.

> - nobody wants to build a federated system; everyone wants to build a Play/Apple/Steam store where they take 30%

I have to pay 30% already. I'd rather pay directly than with my eyeballs and brain (through ads). This is a problem, but it's better to implement a solution, and then lobby for regulation requiring an open, interoperable payment protocol.

> - winner-take-all effects are strong

Sure? We have the same problem for ads and platforms currently.

> - Play store et al already exist, why not use that?

This was already answered by vlehto in a response[1] to your comment you linked above, which you conveniently left out here. I'll quote:

> Play store does not have the content I want. And it seems overly difficult to post the content I want to make. And if I want to pay for engagement with the content, that's not an option.

> Patreon is lot closer to what suits my needs. But even that is too inflexible on how to use payments and to what you should pay. So far everybody seems to be making their micro-transaction payment models "flexible" by making the amount paid flexible. But that's exactly the one thing I want to be fixed. I'd like to host my entirely own webpage and patreon just to handle the money from exactly the kind of transaction I want.

Patreon is obviously not a micropayment platform and grossly inadequate for, well, almost anything - it's run by bad people who take large cuts and screw over creators, the friction to use it is incredibly high, and the payment model (subscriptions) does not scale well and isn't fair to smaller creators.

> - Free substitute goods are just a click away

...and yet, somehow people still pay for things online. This is quite the non-argument.

> - Consumers will pirate anything no matter how cheap the original is

Piracy is obviously evil and I'm doing my best to fight it. But this isn't an argument. In fact, the commonly-touted line "piracy is a service problem" logically implies that low-friction micropayments will make piracy less prevalent, not more.

> - No real consumer demand for micropayments

See above points about the market being subsidized by ads.

> => lemma from previous 3 items: market for online goods is efficient enough to drive all marginal prices to zero

...and yet people still pay money for things.

> - existing problem of the play store letting your kid spend all the money

This has nothing to do with microtransactions at all. This is just a platform permissions problem.

> - friction: it would be great if you didn't have to repeatedly approve things, such as a micropayment for every page of a webcomic archive. But blanket approval lets bad actors drain the jar or inattentive users waste it and then feel conned

It's trivial for someone to break up their webcomic into chapters and have users pay for the bundle. If a particular comic creator doesn't, then they'll very quickly implement that as their readers get incredibly annoyed and leave. And the vast majority of comic creators will use an existing platform to host instead of rolling the microtransaction system themselves. As for being conned? We handle that in exactly the same way as current digital storefronts.

> - first most obvious model for making this work is porn

And? I don't see how this is relevant.

> - Internet has actually killed previously working micro-ish payment systems

See above points about the market being subsidized by ads, systems being launched before their time, etc.

> surviving ones like premium SMS and phone have a scammy, seedy feel

That's purely a function of those things, and is not intrinsic to microtransactions, as evidenced by F2P games.

> - accounting requirements: do you have to pay VAT on that micropayment? do you have to declare it? Is it a federal offence to sell something to an Iranian or North Korean for one cent?

We handle this in exactly the same way as current platforms/payment processors.

[1] https://news.ycombinator.com/item?id=15592626

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