Open to offers

Marketplace

Live SaaS products, content sites, sister-site bundles, and held domains. Open to offers on all listings — scope (domain, code, deployment) is listed per asset.

Active products

Live, operating products. Currently owner-run, open to offers from the right operator.

BillNode

billnode.app
Live

Financial calculators for ecommerce and freelance operators. Net margin, break-even ROAS, fee analysis — all client-side, no data sent.

  • 6 calculators across ecom/DTC and freelance/agency tracks
  • True net margin + break-even ROAS output
  • No account, no server — pure static HTML
  • Self-hosted on OVH
Tools Finance Commerce
Details Visit →

AgentDelivery

agentdelivery.io
Live

Guardrails for AI-agent actions. Budget gates, human approvals, idempotent delivery, and instant rollback between an agent's trigger and the action it fires.

  • Budget & rate ceilings before any action runs
  • Human-in-the-loop approvals on sensitive actions
  • Idempotent delivery + automatic rollback & audit
  • Live in production, self-hosted on OVH
AI Agents SaaS Go
Details Visit →

The New Tradesman

thenewtradesman.com
Live

A publication on recurring failures in software businesses. Patterns, not blame. Judgment and restraint.

  • Pattern-driven editorial format
  • Anonymised case studies across billing, support, trust
  • Ghost CMS, self-hosted on OVH
  • Each post follows a strict pattern schema
Editorial Content Ghost
Visit →

PlainStatement

plainstatement.com
Live

Free invoice generator with paid tiers for saved history, EU VAT validation, share-by-link, payment links, recurring invoices, and a tamper-evident audit ledger. No account required for the free flow.

  • Free: instant invoice + PDF download, no account, no card
  • Basic €50/yr · Pro €100/yr — saved invoices, clients, quotes, payment links, audit ledger
  • EU VAT/VIES validation, reverse-charge clauses, share-by-link, overdue reminders
  • Dedicated VAT invoice, quote, and freelance invoice generators alongside the main flow
  • Express.js + Node, self-hosted on OVH — built and shipping, operator-ready
SaaS Billing Node.js
Details Visit →

ForexFin

forexfin.tech
Live

Free forex calculators and a live price-alerts engine for retail traders. Calculators stay signup-free; alerts use magic-link auth, no password.

  • Eight calculators: position size, pip value, margin, swap, R:R, Kelly, spread cost, Trade Plan Builder
  • Currency Strength Meter, Pair Correlation Matrix, Market-hours visualizer
  • Price-alerts engine — live, magic-link signup, dashboard at /alerts/
  • Learn hub with concept pages (pip, leverage, margin call)
  • Calculators fully client-side; self-hosted on OVH
Tools Fintech Forex
Details Visit →

Sister sites — pair preferred

Two sites built as a reciprocal pair. Sold together by default. Split offers entertained at a premium.

Selling Currently

sellingcurrently.com
Live

AI-driven niche content site across commerce verticals. 50+ published articles, SEO-structured.

  • WordPress with REST API automation pipeline
  • 50+ published articles, actively growing
  • Commerce and affiliate-oriented content
  • Programmatic publishing via this server
Content Commerce WordPress

Currently Selling

currentlyselling.com
In development

Hand-verified deals on the gear online sellers actually use — label printers, packaging, lighting, postage scales, and software for Etsy, Vinted, and eBay shops.

Includes: Domain + codebase

  • Niche focus: tools and gear for small online sellers (Etsy/Vinted/eBay)
  • Astro frontend with category-driven discovery; Skimlinks + GA4 wired behind GDPR consent
  • Affiliate infrastructure built; deals seeded as drafts pending real partnerships
  • Sister site to Selling Currently — pair preferred
Commerce Affiliate

Why these two are stronger together — pair thesis, bundle pricing, and how the sale works.

View pair listing →

Held domains

Parked. Open to reasonable offers.

  • ixvor.com Short, invented. No category constraint. Five characters, premium feel.
  • nhiom.com Compact, unique. Flexible positioning. Five characters.
  • duebeacon.com
  • duerelay.com Prior brand of AgentDelivery (now on agentdelivery.io). Clean .com, two real words, infrastructure / fintech feel.

Make an offer

Acquisition, domain transfer, or partnership. Keep it short — what you want and what context you're bringing.

office@constantin-works.com

Opens your email client. No server-side processing.