We are looking for ten founding operators.

Mirox is opening a private founding cohort of ten Amazon sellers. Sixty days, concierge access, the full sixteen-agent stack. No subscription cost during the program. Founding-member pricing locked for twenty-four months after. Application is at mirox.pt/beta.

This post is the long form of what is on that page — who we are looking for, what we are asking in return, and the parts of the program that take more than a card to explain.

Who Mirox is

Mirox is the Portuguese company building the autonomous PPC intelligence platform of the same name. We are EU-based, founder-led, and currently pre-revenue by design. The product has been in private development for fourteen months and the backend has shipped 472 integration tests, sixteen specialised agents, and seven layers of safety architecture before any customer ever signed.

What we have not done yet is run the live-bidding stack at scale on real seller accounts over a sustained period. That is what the founding cohort is for.

Why ten, not a hundred

A typical SaaS beta opens to a few hundred people, sends them a magic link, and harvests usage data. That works when the product is forgiving. It does not work when the product is an autonomous bidder with the keys to a seller's Amazon Advertising account.

Ten is the number we can support with daily founder eyeballing, a dedicated Slack channel each, a 75-minute kickoff call, and a 30-minute sync every week for the first month. It is the number where every incident gets a written response and every piece of feedback gets read by the person who wrote the code.

It is also the number where the cohort is small enough to harden the live stack before it opens to the public — and large enough to produce the case studies, traces, and aggregated data the rest of the market will eventually want to see.

What you get during the sixty days

• Full access to the Growth-tier capabilities of Mirox. Sixteen agents, multi-marketplace, full decision traces, CSV export, custom reports, kill switch, Shield, Sentinel inventory throttling.
• Concierge onboarding. A 75-minute kickoff call with the founder. A 30-minute weekly sync for four weeks, then bi-weekly.
• Daily founder eyeballing of your account from Day 15 onward. Approximately ten minutes per beta per day, looking for anomalies before the system flags them.
• A Slack channel with the founder and you. Use it for anything. Average response time during waking hours has been under thirty minutes.
• Free Mirox subscription for the full sixty days. Your Amazon ad spend is unchanged — we do not have a billing relationship with Amazon for clicks, and we do not absorb them.

What we ask in return

Three things, written into the agreement.

Live participation, mandatory. Days 1 to 14 are Shadow Mode — the AI reads your account, makes decisions, writes traces, but nothing moves. On Day 15, Live activates. You choose the path: either we onboard a fresh ASIN through Mirox (the system generates four campaigns at the budget you set) or you toggle the per-campaign Live permission on existing campaigns you already run. Either way, real bids flow.

We are explicit about this because the alternative — a cohort that stays in Shadow forever — would not actually harden the live stack. The point of the program is that ten sellers exercise the SP-API write path, the kill switch, Shield, and the post-bid telemetry on real money. Shadow alone exercises about half the codebase that a paying customer touches.

Public attribution. Your name and logo on our website at the end of the program. Pseudonym is fine if your industry is sensitive. We also ask for one 30-minute recorded testimonial interview, permission to publish anonymised aggregate data, and a fifteen-minute structured feedback form once a month.

Honest engagement. The discount that kicks in after the program — 50% off Year 1, then 25% off Year 2, locked from price increases for 24 months — is gated on an engagement milestone, not on having signed up. Specifically: at least one live campaign reaching Day 60 without an emergency kill, and at least one written feedback round delivered. The full criteria are in the agreement. The reason for the gate is that a free beta where the seller logs in twice and forgets is worse for everyone than no beta at all.

After the sixty days

You convert to the Growth plan at €199 per month for twelve months (50% off the public €399). Then €299 per month for twelve more months (25% off). At Month 24 you go to the public Growth rate — whatever it is at that point. You are locked from any price increase in those 24 months even if we re-anchor the public pricing.

Or you walk. No card required to start, no card required to exit. The Mirox subscription cancels and you keep the full export of every decision trace we ever wrote on your account. We are auditable in life and after life.

Who fits

The hand-picked shape we are recruiting against:

• Six growing brands between €1M and €10M annual revenue, 1–3 marketplaces, €20K–€100K monthly Amazon ad spend. The director or founder reads the LinkedIn-saved-posts pile and knows the difference between ACoS and TACoS.
• Three EU multi-marketplace operators with €500K+ revenue, active in three or more of DE / FR / IT / ES / UK, paying either an agency or a tool above $1,000 a month for PPC management today. The "tired of running five separate playbooks" persona.
• One solo operator between €100K and €1M revenue, single marketplace, technically curious, has tried Helium 10 and Sellerboard and is ready for a tool that does more.

If you are reading this and recognising the description, that is the signal.

Who does not fit (yet)

• Agencies managing client accounts. The agency tier is real and the architecture supports it, but we are deferring agency onboarding to Months 4–6 — after the case studies from this cohort exist. Send us a note anyway and we will keep you in the queue.
• US-only sellers with no EU presence. Our edge is per-marketplace specificity in Europe. A US-only account works fine on the product, but the differentiation does not land for the buyer and the case study does not land for us.
• Sellers under €5K per month of Amazon ad spend. Mirox will not noticeably move your numbers at that scale, and the founder-time investment does not justify the asset value. The free Shadow Mode tier opens to the public in Q3 2026 — that is the right entry point.

How to apply

The application is at mirox.pt/beta. It asks for:

• Your business (Amazon storefront name, marketplaces, approximate annual revenue, approximate monthly ad spend).
• What you use today (Pacvue, Perpetua, Quartile, agency name, spreadsheet, etc.).
• One thing about your current setup that frustrates you.
• A LinkedIn or email so we can write back within 72 hours.

The form is read by the founder. The first cohort closes when the tenth seat is filled — currently estimated at six to eight weeks from this post.

If the cohort is full when you apply, you go on the public Shadow Mode waitlist instead. Public Shadow opens in Q3 2026. The waitlist gets the announcement before the website does.

A note on what this is not

We are not running an "AppSumo-style" lifetime-deal launch. We are not running a referral contest. We are not paying anyone to write about the program. The ten seats are how we get the product through its first sustained run on real accounts with founder supervision tight enough to catch problems before sellers do — and the people who fill those seats get terms that reflect that risk.

Apply at mirox.pt/beta.