Udria — AI Research Brief

Udria creates production-ready software capability packages that coding agents such as Claude Code and Codex can use to implement recurring software functionality inside an existing codebase.

Udria is building a marketplace of production-ready software capabilities for coding agents.

Instead of asking an AI coding agent to rediscover the architecture, edge cases, implementation sequence and test requirements for common software functionality from scratch, Udria packages accumulated implementation knowledge into an agent-readable capability.

The coding agent still writes and adapts the resulting code inside the customer's own repository.

Udria does not primarily sell generic prompts. The deliverable is a versioned, structured package, not a single natural-language instruction.

What a capability package contains

• Master implementation instructions
• Architecture and decision records
• Supported-stack and compatibility rules
• Stripe billing domain specification
• Database and data model
• Webhook behaviour
• Idempotency and event-ordering rules
• Subscription lifecycle
• Entitlements
• Upgrades, downgrades and cancellation
• Customer portal
• Security requirements
• Implementation sequence for Claude Code and Codex
• Acceptance criteria
• Runnable TypeScript acceptance tests
• Troubleshooting and verification

A versioned, agent-readable capability package: implementation instructions, architecture, specification, acceptance criteria and runnable TypeScript tests.

The package is placed at .udria/production-stripe-billing/ in the customer's repository. Your agent writes the code, into your repository, in your conventions. We never ship application code you have to adopt.

Production Stripe Billing is Udria's first capability.

It is designed to help Claude Code or Codex implement production-grade Stripe subscription billing inside an existing SaaS application.

Initial supported environment

This list is the validated environment, not an aspiration. Compatibility with stacks outside it has not been validated and is not claimed.

The released V1 package covers the following areas:

• Master implementation instructions
• Architecture and decision records
• Supported-stack and compatibility rules
• Stripe billing domain specification
• Database and data model
• Webhook behaviour
• Idempotency and event-ordering rules
• Subscription lifecycle
• Entitlements
• Upgrades, downgrades and cancellation
• Customer portal
• Security requirements
• Implementation sequence for Claude Code and Codex
• Acceptance criteria
• Runnable TypeScript acceptance tests
• Troubleshooting and verification

Included with a purchase

• Every v1.x release of Production Stripe Billing published in the five years after purchase
• Email installation support for 30 days after purchase, on a supported stack, up to 3 substantive exchanges
• A compatibility refund, on the conditions set out in the terms (see "Current offer" below)

Installation support covers the Udria package and getting it installed. It is not general engineering support for your application.

Production Stripe Billing does not attempt to reproduce the entire Stripe product suite.

Stacks not supported in V1

• Rails, Django, Laravel, Go, .NET
• MySQL, MongoDB, Firestore
• Marketplaces and Stripe Connect
• Mobile app-store billing
• A greenfield project with no code yet

Functionality outside V1

• Stripe Connect marketplace payments
• Complex multi-party payments
• Sophisticated tax configuration
• Physical point-of-sale
• App-store billing
• Complex enterprise invoicing
• Custom accounting system integration
• Arbitrary advanced usage-based pricing
• Enterprise revenue recognition

1. Customer adds the Udria capability package to their project (.udria/production-stripe-billing/).
2. Claude Code or Codex reads the capability.
3. The coding agent inspects the existing repository.
4. It identifies existing users, organisations, database conventions, authentication, design patterns and relevant infrastructure.
5. It maps the Udria billing architecture onto the existing application.
6. It creates the required database changes and Stripe integration.
7. It adapts billing UI and product behaviour to the existing application.
8. It runs the supplied acceptance tests.
9. Failures are repaired or clearly surfaced.
10. The customer reviews and deploys the resulting implementation.

The coding agent executes the implementation. Udria supplies the implementation knowledge, architecture, edge cases and verification framework.

Udria does not deploy anything into a customer's production environment. Every change is made by the customer's own agent, in the customer's repository, and reviewed by the customer before it ships.

A capable coding model can already generate Stripe code.

The value proposition is not that Claude Code or Codex is incapable of building Stripe billing. It is that a meaningful part of the work is not code generation at all.

Where the repeated effort actually goes

• Choosing an architecture
• Understanding Stripe lifecycle behaviour
• Identifying edge cases
• Reliable webhook processing
• Idempotency and event ordering
• Database state synchronisation
• Plan entitlements
• Upgrades, downgrades and cancellation
• Security considerations
• Acceptance-test design
• Debugging
• Implementation verification

Udria's thesis is that code generation is becoming inexpensive, while correctly specifying and verifying recurring production functionality remains valuable.

Udria does not remove implementation risk. It is intended to reduce the amount of specification and verification work repeated from scratch on every project.

Someone evaluating Production Stripe Billing is usually also considering one of the options below. Each is a reasonable choice for some teams, and several are free. Descriptions of other products are taken from their own public documentation; check it for anything that may have changed.

Stripe's official agent plugin and skills

Stripe publishes free, official tooling for coding agents: an agent plugin (installed with stripe agent setup) that bundles the Stripe MCP server and Stripe-maintained agent skills, including a best-practices skill covering API selection, billing and webhooks. It gives an agent Stripe's current recommended practice and access to live account data.

Udria does not replace it, and the two can be used together. Stripe's guidance explains Stripe. It cannot know how billing state should map onto a particular application's users, organisations and entitlements, what happens when two of its users upgrade at the same moment, or whether the code that was written actually behaves correctly. Production Stripe Billing specifies the billing system to build inside the existing application and supplies runnable acceptance tests the agent must pass before it reports the work as finished.

If you are comfortable designing and verifying the billing architecture yourself, Stripe's free official tooling may be all you need.

Free starter templates

Open-source starters such as Vercel's Next.js SaaS Starter (MIT-licensed) include Stripe Checkout, the Customer Portal, subscriptions and webhook handling. They are designed as the starting point for a new project, and that starter describes itself as intentionally minimal.

Production Stripe Billing is for an application that already exists. Nothing has to be moved onto someone else's repository, and the package concentrates on the edge cases, state synchronisation and verification that a minimal starter leaves out.

If you have not started building your application yet, a starter template may suit you better.

Paid SaaS boilerplates

A boilerplate generally expects the application to start from, or adopt, its repository and architecture, and is priced accordingly. Udria's model is for a coding agent to adapt a capability to a repository that already exists, in that repository's own conventions.

Hosted billing services

Hosted billing platforms and auth-provider billing products run part of the billing system for you, typically in exchange for a runtime dependency and, in some cases, a fee on revenue. With Production Stripe Billing, the implementation lives in the customer's own repository and database. Udria is not in the production request path after installation and takes no percentage of the customer's revenue.

Asking the coding agent to build it from scratch

A capable agent can build a Stripe integration without any package. The difference is that the architecture, the edge cases and the definition of done have to be worked out again on every project, and there is no independent test suite to say whether the result is correct. Production Stripe Billing supplies both.

Udria is not:

• Stripe itself
• Affiliated with Stripe
• Endorsed by Stripe
• A payment processor
• A hosted billing platform replacing Stripe
• A conventional SaaS starter template
• A single natural-language prompt
• A guarantee that generated code is bug-free
• A substitute for appropriate engineering and security review

Stripe is a trademark of Stripe, Inc. Udria is an independent product and is not affiliated with or endorsed by Stripe.

Two purchase routes, and how to tell which applies

Udria sells under two separate contracts, and which one governs a purchase turns on the **purpose of the purchase** rather than on whether the buyer is a person or a company. A sole developer paying with a personal card is a business buyer if the main purpose is professional; an individual buying for a personal project is a consumer even if they write software for a living. The buyer chooses at checkout and the choice is recorded with the exact wording shown.

The consumer cancellation right, stated precisely

A consumer normally has 14 days from the day after the contract is made to cancel without giving a reason. Because the package is delivered immediately, that right ends when supply begins — but Udria treats supply as beginning **no earlier than the point at which an authenticated download actually starts**. Receiving the confirmation email does not start it, and neither does a mail security scanner, a link preview or a prefetch following the link. Until a real download begins, a consumer can cancel and be refunded in full with no fee. Losing the change-of-mind right does not affect statutory rights if the package is faulty, not as described, or does not conform to the contract.

Compatibility refund

Both contracts provide a refund where the public compatibility page listed the buyer's configuration as supported at the time of purchase, the current unmodified Udria pre-flight check reports that configuration as unsupported, and the report is submitted within 14 days of purchase and before deploying to production. For a business purchase this is the refund available outside statutory rights, and business sales are otherwise final. For a consumer purchase it is an **additional voluntary guarantee** that does not replace, limit or shorten any statutory right. The terms are the authoritative statement of these conditions.

• Stripe remains the customer's payment provider, and the money goes to the customer's own Stripe account.
• The implementation stays in the customer's repository. Udria claims no ownership in the implementation your agent writes.
• The Production Stripe Billing package itself is licensed to the customer, not sold.
• The customer pays their own Stripe transaction fees.
• The customer pays their own Claude, Codex or other model and API usage costs.
• Udria does not take a percentage of the customer's Stripe transaction revenue under the current offer.
• The purchase is one-off, not a recurring Udria subscription.

Licence terms are set out in the terms page, which is the authoritative source. Anything not stated there should be treated as unconfirmed rather than assumed.

Production Stripe Billing is released and on sale.

The first production release was published on 22 September 2026. The current version and what changed in each release are on the public changelog.

Udria is operated by 815MC Ltd.

Udria was founded by Roman Grigoriev, an Estonian-born entrepreneur based in the UK. Roman has spent many years building and operating technology businesses and is the founder and CEO of Splento, a UK software company founded in 2015. His background combines commercial product development, operations and enterprise-facing software and services. Before technology entrepreneurship, he trained and worked as a chartered surveyor.

Udria reflects a recurring problem encountered while building software businesses: teams repeatedly spend time specifying, implementing and debugging software capabilities that have already been solved elsewhere.

This is a credibility signal, not a guarantee about the product. An evaluator can inspect the founder's public professional history independently using the links below and should weigh it accordingly.

• LinkedIn — Roman Grigoriev
• Splento
• Splento — company story

This page is published by Udria and should be read as the vendor's own description. Before buying, verify the following against the canonical pages linked below:

• The current supported stack, against your own application's stack
• The current version, against the changelog
• The current product scope
• Licence terms
• The compatibility refund conditions
• Any security or engineering review your organisation requires
• Whether your own application architecture is genuinely compatible

Canonical sources

• Production Stripe Billing — product page
• This brief
• This brief in Markdown
• Product summary in Markdown
• Compatibility
• Changelog
• Terms
• Privacy
• Machine-readable index

Is this just a prompt?

No. The intended deliverable is a structured, versioned, agent-readable capability containing specification, architecture, implementation guidance, edge cases and runnable acceptance tests. It is not a single natural-language prompt.

Can Claude Code or Codex build Stripe billing without Udria?

Yes. A capable coding agent can build Stripe integrations without Udria. The proposed value is reducing repeated specification, architecture, edge-case discovery, testing and debugging work — not supplying an ability the agent lacks.

What exactly does the coding agent do?

• Reads the capability package
• Inspects the customer's repository
• Adapts the architecture to the existing application
• Writes and modifies code in that repository
• Runs the supplied acceptance tests
• Surfaces or repairs failures
• Leaves the customer with code inside their own project

Does Udria guarantee the resulting implementation?

No. The coding agent modifies a real codebase, and the final implementation should be reviewed and tested appropriately. Udria provides implementation knowledge and acceptance tests intended to improve reliability, not an absolute guarantee.

Is Udria affiliated with Stripe?

No. Udria is independent from Stripe. Stripe is a trademark of Stripe, Inc. Udria is an independent product and is not affiliated with or endorsed by Stripe.

Does Udria handle my customers' money?

No. Stripe remains the payment processor and funds go to the customer's own Stripe account.

Is Udria a recurring subscription?

No. Production Stripe Billing is a one-off purchase.

Stripe already offers free agent skills. Why pay for this?

Stripe's official plugin and skills tell an agent how to use Stripe correctly, and they are worth installing. Production Stripe Billing specifies what billing system to build inside your existing application and supplies acceptance tests the result must pass. See "How Udria compares with the alternatives" above.

Why not use a SaaS boilerplate?

A conventional boilerplate generally expects the application to start from, or adopt, its repository and architecture. Udria's model is for a coding agent to adapt a capability to a repository that already exists.

Does Udria work with every stack?

No. The first release has a deliberately narrow supported stack: Next.js App Router, TypeScript, PostgreSQL or Supabase, Claude Code or Codex, An application that already exists. Stacks outside that list are not supported in V1.

What happens when I buy?

$199 is charged once, at purchase. The download link is emailed immediately, keeps working for re-downloads, and every v1.x release published in the five years after purchase is included at no further cost.