You asked about Billing
28 people built something like it. 6 are gone.
That is 21% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2022-01-05 | unlock.sh | moved |
| 2022-04-06 | amberflo.io | still up |
| 2022-02-07 | tollguru.com | still up |
| 2021-06-01 | YCLago The AI Native Billing Platform · getlago.com | still up |
| 2023-04-19 | kinde.com | still up |
| 2021-04-25 | rocketapp.me | still up |
| 2019-06-01 | Modern medical billing · aperohealth.com | still up |
| 2021-02-22 | tillypay.com | still up |
| 2025-01-01 | AI for insurance verification & billing at dental clinics · toothy.ai | still up |
| 2025-09-01 | YCZalos Hire Zalos AI workers to run your finance department · zalos.ai | still up |
| 2023-06-01 | YCAlguna AI-Native CPQ & Billing for Modern Pricing Models · alguna.com | still up |
| 2014-06-01 | Subscription billing, rate plan management and analytics as a… · billforward.io | gone |
| 2023-03-30 | stigg.io | still up |
| 2024-06-01 | YCLedgerUp AI agents that handles complex billing and revenue · ledgerup.ai | still up |
| 2025-06-01 | YCAutumn Billing infrastructure for AI · useautumn.com | still up |
| 2025-09-01 | YCLunaBill AI Voice callers for healthcare billing teams · lunabill.com | still up |
| 2023-06-01 | Using generative AI to call insurance for healthcare clinics · healthharbor.co | still up |
| 2023-06-01 | AI-Powered Medical Billing · quillbills.com | still up |
| 2024-06-01 | YCDimely AI-Powered Spreadsheet for Billing Automation · dimely.com | still up |
| 2022-06-01 | YCArgovox Voice AI agents for patient billing and collections · argovox.com | gone |
| 2024-01-01 | YCxPay International Billing Ops, Sales Tax and Payments for SaaS businesses · xpaycheckout.com | still up |
| 2021-06-01 | Zapier for billing · hyperseed.com | gone |
| 2017-06-01 | YCSemantix AI for medical billing · semantix.ai | gone |
| 2022-06-01 | YCLotus Open-Core Pricing and Billing Engine · uselotus.io | gone |
| 2024-06-01 | Artificial Intelligence for your medical billing team · substrate.cc | still up |
| 2026-01-01 | Drop-in Direct Billing SDK for In-App Purchases · zerosettle.io | still up |
| 2026-01-01 | AI-Native Medical Billing Services · overdrive.health | still up |
| 2022-01-01 | YCKable Usage-based billing for API companies · kable.io | gone |
| 2012-06-01 | YCEligible Insurance Billing APIs for Healthcare Businesses · eligible.com | still up |
How this compares
Y Combinator reports its own outcomes, including acquisitions. The other two are judged by asking the domain, so they are not measured the same way and are never averaged together.
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.