Prototypes and MVPs, built to production standards
LX Foundry builds prototypes and MVPs for startups and small companies, the same way production systems are built. Every project is led by a senior engineer with 25+ years of experience, Lead Developer of Boson Protocol since 2021, who uses AI to work faster but never to cut corners. Our 2026 projects are open source and tested, and one already handles real money on mainnet.
Figures as of . Each one links to its evidence.
Three products built from scratch this year and published as open source. Each one is labelled as a prototype or a live product, and each case study shows how to check it yourself.
"If this, then pay" for x402. Nobody pays unless enough do.
Conditional payments for APIs and data. Buyers' USDC waits in an on-chain escrow and is released only when enough buyers have joined, or when the delivered file matches a fingerprint published in advance. Otherwise everyone is refunded on-chain.
"An HTTP 402 challenge that a crowd can answer together."
A proposed extension to x402, the protocol for paying for web resources over HTTP. The seller is paid, and buyers get the resource, only if enough of them pay before a deadline. Until then the money sits in a contract nobody controls, and if the crowd falls short, anyone can trigger the refunds.
"Buy from a stranger. Keep your money until it's sorted."
Purchase protection for second-hand deals between strangers. The payment stays in escrow until courier tracking shows the parcel arrived. If something goes wrong, an AI mediator with strict limits reads the evidence and proposes a split. A person always makes the final decision.
Live real users and real money on a production network Prototype works end to end on a test network Retired hosted demo switched off; code and contract stay public
Test counts come from each repository's latest CI run on main, as of .
"It is built by Ludovic Levalleux through his company LX Foundry, a leading agentic commerce builder and core contributor to Boson Protocol. Solo, he produced contracts integration, oracle adapter, watchdog, evidence assembly, mediator, clerk and buyer UI. Working prototype, in active development, open source."
We build with AI coding agents, and a senior engineer stays in charge. That is the difference from vibe coding.
AI agents make an experienced engineer much faster, but they don't replace one. Software that has to work in production still needs someone to write the specification, direct the agents the way a lead directs a team of developers, review each change, step in when the work drifts, and make the decisions that matter.
That is our job. The habits come from nineteen years of aerospace systems engineering, where requirements are written down before anything is built and every integration is tested. It is also why founders hire LX Foundry instead of vibe-coding the product themselves.
We write the specification and record design decisions before writing code. Quorum402 shipped with a full scheme specification and six architecture decision records, Held with specs, dated plans and runbooks.
Work goes through reviewed pull requests, 23 on Held and 26 on Quorum402, and continuous integration checks each one before it is merged.
More than 2,200 automated tests run on every change across the three builds. They cover smart contracts on a local blockchain, and the AI mediator against recorded model responses.
Held's AI mediator has no tools and cannot move money. It can only propose a split, and a person has to sign it. Earnest's contract can never be upgraded, and pausing it can never block a refund.
We say openly how AI was used (Quorum402 publishes a detailed AI-usage record), and every project ships with the READMEs, specs and runbooks another team needs to run it.
We run AI agents the way a lead engineer runs a development team: clear specifications, small increments, tests as the contract, and a person who reviews and decides.
That is how one engineer built Held's "contracts integration, oracle adapter, watchdog, evidence assembly, mediator, clerk and buyer UI", solo, as Justin Banon put it above.
Our founder, Ludovic Levalleux, has been Lead Developer of Boson Protocol, an open protocol for decentralised and agentic commerce, since March 2021, five years before LX Foundry existed. In 2026, LX Foundry works with the Boson team.
This is production software, with live apps, SDKs and published packages that other developers build on.
The Solidity smart contracts behind every Boson exchange: escrow, redemption and disputes.
The Boson web app for buyers and sellers, and its dispute centre. React and TypeScript.
Commit, redemption and finance widgets that any shop can add to its website.
The core SDK that developers use to build on the protocol, plus major contributions to its React component kit.
The Graph indexers that serve the protocol's data to every Boson app, on all five chains.
Boson kiosks selling redeemable items inside Decentraland since 2021, and a Roblox bridge for token-gated offers.
Led the reference agents for LangChain, Vercel AI SDK, Telegram, XMTP and email, and is a core contributor to the Boson MCP server, which is listed on the official MCP Registry.
An open "escrow" scheme for x402 payments: the specification, a TypeScript implementation published as 12 npm packages, and a proposal to the x402 standard.
Boson Protocol is built by the Boson team, and these are Boson products, shown here as our founder's work within that team. Roles reflect public commit history as of ; each role links to the contributor record.
Full track record →We have shipped each of these. Follow the links to the code, the contract or the live product.
Solidity (EVM), Algorand Python, Hedera. Contracts that cannot be upgraded, refunds anyone can trigger, and experience with an audited protocol.
x402 (HTTP payments), USDC, escrow and conditional payments, gasless meta-transactions.
LLM APIs (Claude) with structured output and strict limits, MCP servers, LangChain, Vercel AI SDK, agent skills.
React, TypeScript, Vite; wallet connection (Algorand and EVM wallets); widgets that other sites can embed.
Node.js and Express, Python and FastAPI, webhooks, TypeScript SDKs, published npm packages.
The Graph subgraphs (hosted and self-hosted), IPFS, chain indexers.
Specifications and decision records, CI, Docker, Fly.io, Cloudflare, reproducible builds.
Decentraland SDK, Roblox.
Dashed chips link to work done with the Boson Protocol team.
For founders and small teams with a product idea that needs to exist soon, in front of users or investors, and shouldn't have to be thrown away later. We turn the idea into a working, tested prototype, then into an MVP that real users can rely on. The work happens in your repository, in the open, with production habits from the first day.
See how Earnest was built →What you get
Senior technical direction, architecture ownership, roadmap planning and technical answers for investors, without hiring a full-time CTO. One to three days a week.
AI agents and LLM features built into your product, with limits that keep a person in charge of anything that matters.
Example: Held's AI mediator →Advice and builds for teams working with Boson Protocol, from the engineer who has been its Lead Developer since 2021.
Boson track record →Architecture reviews, technical due diligence and roadmap planning when you face a big technical decision, without a long engagement.
Not sure which engagement fits? Tell us about your idea, and we'll suggest where to start.
Get in touch →A short, free conversation about your idea, what it would take to build, and whether we're the right fit. You get an honest answer, even if it's no.
Scope, milestones and a fixed quote or day rate, agreed before any work starts.
The work happens in your repository, with CI from the first day, a deployed preview you can click through, and regular demos.
Tests, documentation and a runbook, so your team or your next hire can run it without us.
We deliver working software, and we make it easy to check.
Every claim on this site links to code, contracts or transactions you can inspect, and every product has a label that says what it is today. A prototype is called a prototype.
See the status labels →25+ years of engineering: nineteen in aerospace, as a developer, system and software integrator, system engineering manager and DevOps team lead, then five as Lead Developer of Boson Protocol. You work directly with the person who builds your product.
Track record →We write specifications that other engineers can implement: a full scheme specification and six decision records for Quorum402, and a proposed escrow standard for x402 payments.
x402 escrow proposalYour code lives in your repository from day one, under a licence you control, with the documentation you need to carry on without us.
How an engagement runs →
Founder & Principal Engineer, LX Foundry · Lead Developer, Boson Protocol (since March 2021)
Ludovic spent nineteen years in aerospace, working as a developer, a system and software integrator, a system engineering manager and a DevOps team lead.
Blockchain work started in 2019, with hackathon prizes on Tezos, Polygon, Arweave and Decentraland, and led to the Lead Developer role at Boson Protocol in March 2021. LX Foundry followed in March 2026, to bring that experience to startups.
LinkedIn GitHub X Full track record →
Startups and small companies that need a prototype to test an idea, or an MVP to show users and investors, before hiring a full engineering team makes sense.
You have the vision and you know the market. You need a senior partner who turns the idea into a working MVP and explains the trade-offs in plain English.
You can build, but want senior help on the hard parts: smart contracts, payments, AI agents, or getting a protocol integration right the first time.
You have an idea for a new product alongside the day job, and want it built properly without hiring a team for an experiment.
Payments & stablecoins
Decentralised commerce & marketplaces
AI agents & automation
Data products & APIs
Games & virtual worlds
Pre-seed to Series A
Ready to build something real?
Whether you have a clear brief or an early idea, get in touch. We'll tell you honestly whether we're the right fit, and if we are, we can start quickly.
contact@lxfoundry.ai