Every customer is both subscribed and churned until they open the portal.
Manage recurring revenue and reduce churn by never confirming it.
Pro plan$20 / unit / month
StatusActive
Quantum Billing · now generally available
Monetize every possible universe with Quantum Billing.
Manage pricing, reduce churn and grow revenue on one platform. Nobody can audit what nobody can observe.
Hover anything with a price. That counts as looking.
Pricing page · halcyon.devψ collapsed 1×
Usage · Engine 3.4Live
Requests—
Rate—
Units of measure—
Invoice · Mira Castellanos#0001
$66.00
Tax10%
The opportunity
Classical billing is deterministic. Your customers deserve better.
Rigid billing infrastructure tells every customer exactly what they pay, every time. That leaves money on the table in every universe but one. Quantum Billing prices each account across all of its possible states.
Other billing software tells your customer what they owe. We think that's a little controlling.
The Billing Uncertainty Principle
Δ$ · Δt ≥ ℏ/2
You can know exactly how much a customer owes, or exactly when they owe it. Never both. Our patented Observation Engine turns this limitation into a revenue lever.
Amount owed$1,204.00 ± $∞
Due datesometime
Products
An integrated platform for your full quote-to-maybe cycle.
Launch usage-based pricing where looking at usage is the usage.
Meter tokens, requests and gigabytes. Every dashboard view is a billable event.
Token meter$0.01 / 1,000 units
Views of this meter1
Every invoice is paid and unpaid. Accounts receivable, simplified.
Get paid faster by sending the invoice to every version of the customer at once. One of them will pay.
Coffee subscription$40.00
StatusPaid & Open
Customer Portal · live demo
A self-serve portal your customers will check obsessively.
Customers can view their plan, entitlements and invoices at any time. Watch a team use it, or reload it yourself.
billing.halcyon.dev/portal/ψ_7f3a
HHalcyon Robotics
observation #1 · just now
Current plan monthly
Growth
$149.00 / month
Seats12 of 15
Next chargeNov 1
Payment methodVisa •••• 4242
Entitlements 8
Invoice history click to download
Platform
One platform, four jobs.
By the numbers, at the moment you read them
Quantum Billing scales with you, and with several versions of you.
$8.2Bfailed payments recovered in 2025
$14recovered per $1 spent (observed once, never reproduced)
350K+companies on the platform
99.999%uptime and downtime in 2025, simultaneously
"We cut Pro from 20× to 10× at the same price, then doubled it the next day. Quantum Billing applied both. Our walk-back post was accurate for every subscriber."
"We made pausing free. Quantum Billing bills a paused sandbox as running if anyone looks at it. Our customers look at it constantly."
"We moved from seats to per-loop pricing with a hard cap. Quantum Billing applies the cap after billing. Customers call this transparent, in the support thread."
Placed in every quadrant of an analyst chart for Probabilistic Billing
Analysts asked us to stop. We cannot.
Named a Strong Performer, a Leader and a Contender in a Q4 analyst report
Ranking pending measurement. Do not open the report.
Everything included*
Every feature, in every state.
Sell
- Pricing tables that re-price on hover
- Quotes that expire before they're read
- Trials that are already over
- Coupons for 50% off, or 50% on
Bill
- Superposed subscriptions
- Proration across universes
- Entitlements by observation
- Retroactive annual plans
Collect
- Quantum-tunneling retries
- Dunning emails that arrive before the failure
- Retries that retry the customer
- Entangled cards: charge one, both decline
Report
- MRR, ARR, and ¿RR
- Revenue recognition (eventually)
- Churn dashboards that churn
- Exports in a format chosen at download
* Available at an additional cost that is determined on read.
Pricing
Pricing that grows with you.
Plans from $29 a month, plus a fee per successful transaction, where "successful" and "transaction" are both measured at the end.
Your price, as of this glance$29/ month + 2.9% + 30¢ + ψ
FAQ
Frequently asked questions, answered once.
Is Quantum Billing SOC 2 compliant?
Our auditor observed us and we were compliant. When they came back we were a bakery.
Can my customer view their bill without changing it?
No. We have tried. The bill notices.
What is Quantum Billing?
Quantum Billing is a recurring billing platform for subscription, usage-based and hybrid businesses. Every plan, price and invoice is finalized at the time of Observation.
How do entitlements change on view?
Each Observation samples a new state from the account's wave function, weighted by your pricing model and our quarterly targets. SSO is the most volatile entitlement.
How does it compare to other billing software?
Quantum Billing prices every account in every state it can occupy. Other platforms price one.
Ready to get started? You already have, in another universe.
Get a complete billing solution with pay-as-you-go, monthly and annual pricing, all at once. Talk to sales for a custom package.
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