€18,000 with five AI agents: one forum user's math

Five AI agents and an €18,000 calculation: no payrolls

A language model has been generating code "non stop" all day, according to one forum user's account. The subscription costs 90 euros a month, and the goal he himself admits is not learning to code: it's putting programmers out of work. That's the scene that captures the current state of vibe coding, the practice of letting AI write code while you watch. Behind the enthusiasm lies an uncomfortable question: does this actually generate revenue, or is it just noise?

How much do AI agents really make

The highest figure on the table is €18,000 in September billing, according to the calculation of the person telling the story, with five agents working in parallel (micro-SaaS, automation for businesses, niche validation) and €10,000 in clean cash after tools, APIs and acquisition. Whoever makes that calculation sums it up like this: "My job is no longer 'coding': it's deciding what to build, setting constraints, watching metrics and quickly killing whatever doesn't show traction." His golden rule is that cash beats hype, and that an experiment is only worth it if it bills.

The doubt comes quickly. A business that doesn't get repeat customers is a summer fling, and €18,000 in a single month says nothing about what will be left in January. That's where opinions split: nobody disputes that you can bill, what's disputed is whether it's sustainable.

The archetype of the micro-SaaS that bills zero

In parallel, another forum user has written the parody of the genre: one agent launches yet another PDF summarizing tool and bills 0 euros while competing with 4,800 rivals on Product Hunt that same week; another sends 600 cold emails with a generic pitch until the domain ends up on spam blacklists; a third burns 90 dollars in tokens trying to fix a concurrency bug that the model itself broke three instructions earlier. The punchline: the first payment secured is 9 dollars.

The project with the most code behind it bills exactly zero, according to the forum user himself. The market doesn't pay for pretty architecture, in the words of another participant.

Why is it harder to make money in Spain?

Setting up a limited company, corporate tax, income tax and quarterly VAT come up as soon as someone proposes actually getting paid. Some call it, without nuance, impossible. On top of that comes a deeper diagnosis: endless subscriptions have annoyed people, and the average user only pays for the essentials.

And the same old pipe dream — a product that sustains itself with a small percentage of the planet's eight billion people — falls down the three classic steps: nobody knows the platform, you have to spend obscene amounts on acquisition and then retain the user, and the final boss remains: convincing someone to pull out their card.

The bottleneck isn't code, it's marketing

Here comes the nuance almost nobody wants to admit. Several finished projects never go on sale because their creator keeps adding antiestéticatures instead of selling them. The bottleneck is sales, one forum user admits bluntly. And when someone asks for a concrete example — what it's for and who pays for it — nobody answers.

The business that actually works is usually the one with the least code: the two-hour experiment. The one that piles up months of development is still at zero.

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With that picture, the promise of putting programmers out of work sounds like a headline from another year. The figure that throws people off isn't how much the best agent bills, but that the one with the most code bills exactly 0 euros.