100 creditsOne-time
Starter Proof Pass
A focused first pass for one stubborn theorem.
$19USD / pass
- ✓100 reusable proof credits
- ✓Lean 4 statement and import review
- ✓Failure triage with next-step notes
- ✓Private claim code and intake checklist
Independent Lean 4 proof engineering
Proofs are code.Treat them that way.
Bounded proof-engineering passes for Lean 4 formalization, stuck-proof repair and verification-ready review. Clear scope, reproducible feedback and no subscription.
Stripe-secured checkout Private order page Manual, tracked delivery
Kernel checked
theorem repairtheorem append_length ... := by
induction xs with
| nil => simp
| cons x xs ih => simp [ih]
Statement
Clear
Goal
Clear
Build
Pass
Delivery state
✓ Manual and tracked
100 / 500 / 2,000
Credits per pass
USD
Server-verified pricing
Lean 4
Formal verification focus
Private
Order and delivery tracking
One-time proof passes
Pick the size of the uncertainty you need removed.
Every pass is paid once in USD and delivered manually to a private order page. No subscription, no customer login and no account credentials.
500 creditsOne-time
Pro Proof Pass
Enough room to repair a real proof campaign.
$79USD / pass
- ✓500 reusable proof credits
- ✓Lemma and dependency mapping
- ✓Proof-repair iteration notes
- ✓Priority intake guidance
2,000 creditsOne-time
Team Proof Pass
Shared capacity for a formal verification push.
$249USD / pass
- ✓2,000 reusable proof credits
- ✓Shared proof backlog intake
- ✓Team onboarding checklist
- ✓Campaign-level review notes
Prices are loaded from the live PostgreSQL catalogue. Stripe displays the final charge and the server verifies the amount before delivery.
What the pass covers
Less guessing. More kernel-checked progress.
A proof pass is scoped engineering attention, not an API key and not a promise that an open problem will close. The deliverable is a cleaner path to verification.
theorem deliverable :
ReproducibleBuild ∧
ReviewedStatement ∧
NextAction
ReproducibleBuild ∧
ReviewedStatement ∧
NextAction
Statement review
Check domains, edge cases and whether the formal theorem matches the intended claim.
Failure triage
Reproduce the build, isolate the declaration and identify the actual blocker.
Proof repair
Map dependencies, find useful lemmas and produce a smaller verified step.
Verification notes
Record the toolchain, command, diff, assumptions and unresolved boundary.
Delivery flow
From checkout to reproducible proof work.
Select each step to preview the order state. Delivery is manual, but the payment and order state are tracked automatically.
alphaproofcode.xyz/order
✓
Order state
Scope selected
Match the pass size to the uncertainty in front of you — one theorem, a repair campaign, or a shared backlog.
OrderTracked
APC2026-••••-7K2QScope selected
Proof-engineering field notes
Better questions before better tactics.
Foundations8 min
What Is Lean 4 Proof Engineering?
A practical introduction to Lean 4 proof engineering: statements, tactics, dependencies, build feedback and the work between an idea and a verified artifact.
Read the guide →Workflow9 min
A Lean 4 Proof Repair Workflow That Stays Reproducible
A repeatable Lean 4 proof-repair workflow: reproduce the failure, minimize the declaration, inspect the goal, repair locally, and verify the final build.
Read the guide →Planning7 min
Scoping a Lean Formalization Project Before You Commit
How to scope a Lean formalization project with explicit definitions, theorem boundaries, dependencies, acceptance criteria and a realistic verification budget.
Read the guide →FAQ
Straight answers before checkout.
Need more detail? The full FAQ covers delivery, credits, payment and scope.
Read the full FAQWhat is AlphaProof Code?
AlphaProof Code is an independent storefront for proof-engineering passes. The passes provide credits for Lean 4 formalization, proof repair and verification-oriented review. It is not an official Google or DeepMind product.
What counts as a proof credit?
A credit is an internal unit used to scope proof-engineering work. The intake instructions explain how to submit a theorem, repository context and the verification state you need. Credits are consumed only after work is accepted into the queue.
How is a pass delivered?
After Stripe confirms payment, the pass is prepared manually and posted to your private order page as a claim code with intake instructions. You can return with your order number and purchase email if you lose the page.
Do I need a Google account?
No. Checkout requires only a purchase email. There is no customer login and no Google account connection.
Can you guarantee that a theorem will be proved?
No. Formalization depends on the statement, available libraries, compute budget and mathematical scope. We provide bounded proof-engineering effort and clear verification notes, not a promise that every open problem will close.
What payment methods are supported?
Stripe Checkout handles payment in USD and may offer cards, Apple Pay or Google Pay when the buyer's device and region support them. The amount shown on Stripe is the final charge.
Start with the smallest useful step