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.

Status: this is the planned V1 scope. Production Stripe Billing has not been delivered yet — see "Current status" below. Nothing in this list should be read as already shipped.

The planned 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 founding reservation

• Every update to Production Stripe Billing v1.x
• Founding-customer status and pricing
• Direct installation support if your coding agent hits a problem with the package

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.

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.

How the reservation works

1. The customer provides a valid payment method.
2. Stripe validates and saves the payment method.
3. Nothing is charged at reservation — $0 is taken.
4. The customer authorises a future one-off $199 charge.
5. Udria charges only when the founding product is ready for delivery.
6. The customer receives 3–5 days' notice by email before any charge.
7. The customer may cancel at any time before the charge.

If Production Stripe Billing is not ready by 31 October 2026, reservations expire automatically and no card is charged.

The card is stored by Stripe, not by Udria. Cancelling a reservation detaches the saved payment method.

• Stripe remains the customer's payment provider, and the money goes to the customer's own Stripe account.
• The customer's resulting application code belongs to the customer, subject to the Udria product licence.
• 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 founding offer.
• The founding offer is a one-off purchase, 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 currently offered as a founding reservation. It has not been delivered yet.

Udria is completing the first production release. The package described on this page is the planned V1 scope, not a shipped product, and this page will be updated as that changes.

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 release status and whether the package has actually shipped
• The current delivery deadline
• The current product scope, and which parts are planned rather than delivered
• Licence terms
• Cancellation terms
• Future-charge terms and the notice period
• 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
• 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. The current founding capability is offered as a one-off purchase.

Why not use a SaaS boilerplate?

A conventional boilerplate generally expects the application to start from, or adopt, its repository and architecture. Udria's intended 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 or Pages Router), TypeScript, PostgreSQL or Supabase, Claude Code or Codex, An application that already exists. Stacks outside that list are not supported in V1.

Is my card charged when I reserve?

No. $0 is charged at reservation. The card is saved by Stripe and charged once, $199, only when the product is ready for delivery — with 3–5 days' notice, and only if the customer has not cancelled.